com.datastax.driver.core.Cluster Maven / Gradle / Ivy
Show all versions of scylla-driver-core Show documentation
/*
* Copyright DataStax, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/*
* Copyright (C) 2019 ScyllaDB
*
* Modified by ScyllaDB
*/
package com.datastax.driver.core;
import static com.datastax.driver.core.SchemaElement.KEYSPACE;
import com.datastax.driver.core.exceptions.AuthenticationException;
import com.datastax.driver.core.exceptions.BusyConnectionException;
import com.datastax.driver.core.exceptions.ConnectionException;
import com.datastax.driver.core.exceptions.InvalidQueryException;
import com.datastax.driver.core.exceptions.NoHostAvailableException;
import com.datastax.driver.core.exceptions.SyntaxError;
import com.datastax.driver.core.exceptions.UnsupportedProtocolVersionException;
import com.datastax.driver.core.policies.AddressTranslator;
import com.datastax.driver.core.policies.IdentityTranslator;
import com.datastax.driver.core.policies.LatencyAwarePolicy;
import com.datastax.driver.core.policies.LoadBalancingPolicy;
import com.datastax.driver.core.policies.PagingOptimizingLoadBalancingPolicy;
import com.datastax.driver.core.policies.Policies;
import com.datastax.driver.core.policies.ReconnectionPolicy;
import com.datastax.driver.core.policies.RetryPolicy;
import com.datastax.driver.core.policies.SpeculativeExecutionPolicy;
import com.datastax.driver.core.utils.MoreFutures;
import com.google.common.annotations.VisibleForTesting;
import com.google.common.base.Functions;
import com.google.common.base.Predicates;
import com.google.common.base.Strings;
import com.google.common.base.Throwables;
import com.google.common.collect.HashMultimap;
import com.google.common.collect.Iterables;
import com.google.common.collect.Lists;
import com.google.common.collect.MapMaker;
import com.google.common.collect.SetMultimap;
import com.google.common.collect.Sets;
import com.google.common.util.concurrent.AsyncFunction;
import com.google.common.util.concurrent.FutureCallback;
import com.google.common.util.concurrent.Futures;
import com.google.common.util.concurrent.ListenableFuture;
import com.google.common.util.concurrent.ListeningExecutorService;
import com.google.common.util.concurrent.MoreExecutors;
import com.google.common.util.concurrent.SettableFuture;
import com.google.common.util.concurrent.Uninterruptibles;
import java.io.Closeable;
import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.net.InetAddress;
import java.net.InetSocketAddress;
import java.net.URL;
import java.net.UnknownHostException;
import java.security.GeneralSecurityException;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.HashMap;
import java.util.Iterator;
import java.util.LinkedHashSet;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;
import java.util.ResourceBundle;
import java.util.Set;
import java.util.concurrent.BlockingQueue;
import java.util.concurrent.CancellationException;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ConcurrentMap;
import java.util.concurrent.CopyOnWriteArraySet;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Future;
import java.util.concurrent.FutureTask;
import java.util.concurrent.ScheduledExecutorService;
import java.util.concurrent.ThreadPoolExecutor;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicInteger;
import java.util.concurrent.atomic.AtomicReference;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* Information and known state of a Cassandra cluster.
*
* This is the main entry point of the driver. A simple example of access to a Cassandra cluster
* would be:
*
*
* Cluster cluster = Cluster.builder().addContactPoint("192.168.0.1").build();
* Session session = cluster.connect("db1");
*
* for (Row row : session.execute("SELECT * FROM table1"))
* // do something ...
*
*
* A cluster object maintains a permanent connection to one of the cluster nodes which it uses
* solely to maintain information on the state and current topology of the cluster. Using the
* connection, the driver will discover all the nodes currently in the cluster as well as new nodes
* joining the cluster subsequently.
*/
public class Cluster implements Closeable {
private static final Logger logger = LoggerFactory.getLogger(Cluster.class);
private static final ResourceBundle driverProperties =
ResourceBundle.getBundle("com.datastax.driver.core.Driver");
static {
logDriverVersion();
// Force initialization to fail fast if there is an issue detecting the version
GuavaCompatibility.init();
}
@VisibleForTesting
static final int NEW_NODE_DELAY_SECONDS =
SystemProperties.getInt("com.datastax.driver.NEW_NODE_DELAY_SECONDS", 1);
// Used in integration tests to force the driver to negotiate the protocol
// version even if it was explicitly set.
@VisibleForTesting static boolean shouldAlwaysNegotiateProtocolVersion = false;
// Some per-JVM number that allows to generate unique cluster names when
// multiple Cluster instance are created in the same JVM.
private static final AtomicInteger CLUSTER_ID = new AtomicInteger(0);
private static final int NOTIF_LOCK_TIMEOUT_SECONDS =
SystemProperties.getInt("com.datastax.driver.NOTIF_LOCK_TIMEOUT_SECONDS", 60);
final Manager manager;
/**
* Constructs a new Cluster instance.
*
*
This constructor is mainly exposed so Cluster can be sub-classed as a means to make
* testing/mocking easier or to "intercept" its method call. Most users shouldn't extend this
* class however and should prefer either using the {@link #builder} or calling {@link #buildFrom}
* with a custom Initializer.
*
* @param name the name to use for the cluster (this is not the Cassandra cluster name, see {@link
* #getClusterName}).
* @param contactPoints the list of contact points to use for the new cluster.
* @param configuration the configuration for the new cluster.
*/
protected Cluster(String name, List contactPoints, Configuration configuration) {
this(name, contactPoints, configuration, Collections.emptySet());
}
/**
* Constructs a new Cluster instance.
*
* This constructor is mainly exposed so Cluster can be sub-classed as a means to make
* testing/mocking easier or to "intercept" its method call. Most users shouldn't extend this
* class however and should prefer using the {@link #builder}.
*
* @param initializer the initializer to use.
* @see #buildFrom
*/
protected Cluster(Initializer initializer) {
this(
initializer.getClusterName(),
checkNotEmpty(initializer.getContactPoints()),
initializer.getConfiguration(),
initializer.getInitialListeners());
}
private static List checkNotEmpty(List contactPoints) {
if (contactPoints.isEmpty())
throw new IllegalArgumentException("Cannot build a cluster without contact points");
return contactPoints;
}
private Cluster(
String name,
List contactPoints,
Configuration configuration,
Collection listeners) {
System.out.println("===== Using optimized driver!!! =====");
logger.info("===== Using optimized driver!!! =====");
this.manager = new Manager(name, contactPoints, configuration, listeners);
}
/**
* Initialize this Cluster instance.
*
* This method creates an initial connection to one of the contact points used to construct the
* {@code Cluster} instance. That connection is then used to populate the cluster {@link
* Metadata}.
*
*
Calling this method is optional in the sense that any call to one of the {@code connect}
* methods of this object will automatically trigger a call to this method beforehand. It is thus
* only useful to call this method if for some reason you want to populate the metadata (or test
* that at least one contact point can be reached) without creating a first {@code Session}.
*
*
Please note that this method only creates one control connection for gathering cluster
* metadata. In particular, it doesn't create any connection pools. Those are created when a new
* {@code Session} is created through {@code connect}.
*
*
This method has no effect if the cluster is already initialized.
*
* @return this {@code Cluster} object.
* @throws NoHostAvailableException if no host amongst the contact points can be reached.
* @throws AuthenticationException if an authentication error occurs while contacting the initial
* contact points.
* @throws IllegalStateException if the Cluster was closed prior to calling this method. This can
* occur either directly (through {@link #close()} or {@link #closeAsync()}), or as a result
* of an error while initializing the Cluster.
*/
public Cluster init() {
register(new PagingOptimizingLatencyTracker());
this.manager.init();
return this;
}
/**
* Build a new cluster based on the provided initializer.
*
*
Note that for building a cluster pragmatically, Cluster.Builder provides a slightly less
* verbose shortcut with {@link Builder#build}.
*
*
Also note that that all the contact points provided by {@code initializer} must share the
* same port.
*
* @param initializer the Cluster.Initializer to use
* @return the newly created Cluster instance
* @throws IllegalArgumentException if the list of contact points provided by {@code initializer}
* is empty or if not all those contact points have the same port.
*/
public static Cluster buildFrom(Initializer initializer) {
return new Cluster(initializer);
}
/**
* Creates a new {@link Cluster.Builder} instance.
*
*
This is a convenience method for {@code new Cluster.Builder()}.
*
* @return the new cluster builder.
*/
public static Cluster.Builder builder() {
return new Cluster.Builder();
}
/**
* Returns the current version of the driver.
*
*
This is intended for products that wrap or extend the driver, as a way to check
* compatibility if end-users override the driver version in their application.
*
* @return the version.
*/
public static String getDriverVersion() {
return driverProperties.getString("driver.version");
}
/**
* Logs the driver version to the console.
*
*
This method logs the version using the logger {@code com.datastax.driver.core} and level
* {@code INFO}.
*/
public static void logDriverVersion() {
Logger core = LoggerFactory.getLogger("com.datastax.driver.core");
core.info("DataStax Java driver {} for Apache Cassandra", getDriverVersion());
}
/**
* Creates a new session on this cluster but does not initialize it.
*
*
Because this method does not perform any initialization, it cannot fail. The initialization
* of the session (the connection of the Session to the Cassandra nodes) will occur if either the
* {@link Session#init} method is called explicitly, or whenever the returned session object is
* used.
*
*
Once a session returned by this method gets initialized (see above), it will be set to no
* keyspace. If you want to set such session to a keyspace, you will have to explicitly execute a
* 'USE mykeyspace' query.
*
*
Note that if you do not particularly need to defer initialization, it is simpler to use one
* of the {@code connect()} method of this class.
*
* @return a new, non-initialized session on this cluster.
*/
public Session newSession() {
checkNotClosed(manager);
return manager.newSession();
}
/**
* Creates a new session on this cluster and initialize it.
*
*
Note that this method will initialize the newly created session, trying to connect to the
* Cassandra nodes before returning. If you only want to create a Session object without
* initializing it right away, see {@link #newSession}.
*
* @return a new session on this cluster sets to no keyspace.
* @throws NoHostAvailableException if the Cluster has not been initialized yet ({@link #init} has
* not be called and this is the first connect call) and no host amongst the contact points
* can be reached.
* @throws AuthenticationException if an authentication error occurs while contacting the initial
* contact points.
* @throws IllegalStateException if the Cluster was closed prior to calling this method. This can
* occur either directly (through {@link #close()} or {@link #closeAsync()}), or as a result
* of an error while initializing the Cluster.
*/
public Session connect() {
try {
return Uninterruptibles.getUninterruptibly(connectAsync());
} catch (ExecutionException e) {
throw DriverThrowables.propagateCause(e);
}
}
/**
* Creates a new session on this cluster, initialize it and sets the keyspace to the provided one.
*
*
Note that this method will initialize the newly created session, trying to connect to the
* Cassandra nodes before returning. If you only want to create a Session object without
* initializing it right away, see {@link #newSession}.
*
* @param keyspace The name of the keyspace to use for the created {@code Session}.
* @return a new session on this cluster sets to keyspace {@code keyspaceName}.
* @throws NoHostAvailableException if the Cluster has not been initialized yet ({@link #init} has
* not be called and this is the first connect call) and no host amongst the contact points
* can be reached, or if no host can be contacted to set the {@code keyspace}.
* @throws AuthenticationException if an authentication error occurs while contacting the initial
* contact points.
* @throws InvalidQueryException if the keyspace does not exist.
* @throws IllegalStateException if the Cluster was closed prior to calling this method. This can
* occur either directly (through {@link #close()} or {@link #closeAsync()}), or as a result
* of an error while initializing the Cluster.
*/
public Session connect(String keyspace) {
try {
return Uninterruptibles.getUninterruptibly(connectAsync(keyspace));
} catch (ExecutionException e) {
throw DriverThrowables.propagateCause(e);
}
}
/**
* Creates a new session on this cluster and initializes it asynchronously.
*
*
This will also initialize the {@code Cluster} if needed; note that cluster initialization
* happens synchronously on the thread that called this method. Therefore it is recommended to
* initialize the cluster at application startup, and not rely on this method to do it.
*
*
Note that if a {@linkplain Configuration#getDefaultKeyspace() default keyspace} has been
* configured for use with a DBaaS cluster, this method will attempt to set the session keyspace
* to that keyspace, effectively behaving like {@link #connect(String)}.
*
* @return a future that will complete when the session is fully initialized.
* @throws NoHostAvailableException if the Cluster has not been initialized yet ({@link #init} has
* not been called and this is the first connect call) and no host amongst the contact points
* can be reached.
* @throws IllegalStateException if the Cluster was closed prior to calling this method. This can
* occur either directly (through {@link #close()} or {@link #closeAsync()}), or as a result
* of an error while initializing the Cluster.
* @see #connect()
*/
public ListenableFuture connectAsync() {
String defaultKeyspace = getConfiguration().getDefaultKeyspace();
return connectAsync(defaultKeyspace);
}
/**
* Creates a new session on this cluster, and initializes it to the given keyspace asynchronously.
*
* This will also initialize the {@code Cluster} if needed; note that cluster initialization
* happens synchronously on the thread that called this method. Therefore it is recommended to
* initialize the cluster at application startup, and not rely on this method to do it.
*
* @param keyspace The name of the keyspace to use for the created {@code Session}.
* @return a future that will complete when the session is fully initialized.
* @throws NoHostAvailableException if the Cluster has not been initialized yet ({@link #init} has
* not been called and this is the first connect call) and no host amongst the contact points
* can be reached.
* @throws IllegalStateException if the Cluster was closed prior to calling this method. This can
* occur either directly (through {@link #close()} or {@link #closeAsync()}), or as a result
* of an error while initializing the Cluster.
*/
public ListenableFuture connectAsync(final String keyspace) {
checkNotClosed(manager);
init();
final Session session = manager.newSession();
ListenableFuture sessionInitialized = session.initAsync();
if (keyspace == null) {
return sessionInitialized;
} else {
final String useQuery = "USE " + keyspace;
ListenableFuture keyspaceSet =
GuavaCompatibility.INSTANCE.transformAsync(
sessionInitialized,
new AsyncFunction() {
@Override
public ListenableFuture apply(Session session) throws Exception {
return session.executeAsync(useQuery);
}
});
ListenableFuture withErrorHandling =
GuavaCompatibility.INSTANCE.withFallback(
keyspaceSet,
new AsyncFunction() {
@Override
public ListenableFuture apply(Throwable t) throws Exception {
session.closeAsync();
if (t instanceof SyntaxError) {
// Give a more explicit message, because it's probably caused by a bad keyspace
// name
SyntaxError e = (SyntaxError) t;
t =
new SyntaxError(
e.getEndPoint(),
String.format(
"Error executing \"%s\" (%s). Check that your keyspace name is valid",
useQuery, e.getMessage()));
}
throw Throwables.propagate(t);
}
});
return GuavaCompatibility.INSTANCE.transform(withErrorHandling, Functions.constant(session));
}
}
/**
* The name of this cluster object.
*
* Note that this is not the Cassandra cluster name, but rather a name assigned to this Cluster
* object. Currently, that name is only used for one purpose: to distinguish exposed JMX metrics
* when multiple Cluster instances live in the same JVM (which should be rare in the first place).
* That name can be set at Cluster building time (through {@link Builder#withClusterName} for
* instance) but will default to a name like {@code cluster1} where each Cluster instance in the
* same JVM will have a different number.
*
* @return the name for this cluster instance.
*/
public String getClusterName() {
return manager.clusterName;
}
/**
* Returns read-only metadata on the connected cluster.
*
*
This includes the known nodes with their status as seen by the driver, as well as the schema
* definitions. Since this return metadata on the connected cluster, this method may trigger the
* creation of a connection if none has been established yet (neither {@code init()} nor {@code
* connect()} has been called yet).
*
* @return the cluster metadata.
* @throws NoHostAvailableException if the Cluster has not been initialized yet and no host
* amongst the contact points can be reached.
* @throws AuthenticationException if an authentication error occurs while contacting the initial
* contact points.
* @throws IllegalStateException if the Cluster was closed prior to calling this method. This can
* occur either directly (through {@link #close()} or {@link #closeAsync()}), or as a result
* of an error while initializing the Cluster.
*/
public Metadata getMetadata() {
manager.init();
return manager.metadata;
}
/**
* The cluster configuration.
*
* @return the cluster configuration.
*/
public Configuration getConfiguration() {
return manager.configuration;
}
/**
* The cluster metrics.
*
* @return the cluster metrics, or {@code null} if this cluster has not yet been {@link #init()
* initialized}, or if metrics collection has been disabled (that is if {@link
* Configuration#getMetricsOptions} returns {@code null}).
*/
public Metrics getMetrics() {
checkNotClosed(manager);
return manager.metrics;
}
/**
* Registers the provided listener to be notified on hosts up/down/added/removed events.
*
*
Registering the same listener multiple times is a no-op.
*
*
This method should be used to register additional listeners on an already-initialized
* cluster. To add listeners to a cluster object prior to its initialization, use {@link
* Builder#withInitialListeners(Collection)}. Calling this method on a non-initialized cluster
* will result in the listener being {@link
* com.datastax.driver.core.Host.StateListener#onRegister(Cluster) notified} twice of cluster
* registration: once inside this method, and once at cluster initialization.
*
* @param listener the new {@link Host.StateListener} to register.
* @return this {@code Cluster} object;
*/
public Cluster register(Host.StateListener listener) {
checkNotClosed(manager);
boolean added = manager.listeners.add(listener);
if (added) listener.onRegister(this);
return this;
}
/**
* Unregisters the provided listener from being notified on hosts events.
*
*
This method is a no-op if {@code listener} hasn't previously been registered against this
* Cluster.
*
* @param listener the {@link Host.StateListener} to unregister.
* @return this {@code Cluster} object;
*/
public Cluster unregister(Host.StateListener listener) {
checkNotClosed(manager);
boolean removed = manager.listeners.remove(listener);
if (removed) listener.onUnregister(this);
return this;
}
/**
* Registers the provided tracker to be updated with hosts read latencies.
*
*
Registering the same tracker multiple times is a no-op.
*
*
Beware that the registered tracker's {@link LatencyTracker#update(Host, Statement,
* Exception, long) update} method will be called very frequently (at the end of every query to a
* Cassandra host) and should thus not be costly.
*
*
The main use case for a {@link LatencyTracker} is to allow load balancing policies to
* implement latency awareness. For example, {@link LatencyAwarePolicy} registers it's own
* internal {@code LatencyTracker} (automatically, you don't have to call this method directly).
*
* @param tracker the new {@link LatencyTracker} to register.
* @return this {@code Cluster} object;
*/
public Cluster register(LatencyTracker tracker) {
checkNotClosed(manager);
boolean added = manager.latencyTrackers.add(tracker);
if (added) tracker.onRegister(this);
return this;
}
/**
* Unregisters the provided latency tracking from being updated with host read latencies.
*
*
This method is a no-op if {@code tracker} hasn't previously been registered against this
* Cluster.
*
* @param tracker the {@link LatencyTracker} to unregister.
* @return this {@code Cluster} object;
*/
public Cluster unregister(LatencyTracker tracker) {
checkNotClosed(manager);
boolean removed = manager.latencyTrackers.remove(tracker);
if (removed) tracker.onUnregister(this);
return this;
}
/**
* Registers the provided listener to be updated with schema change events.
*
*
Registering the same listener multiple times is a no-op.
*
* @param listener the new {@link SchemaChangeListener} to register.
* @return this {@code Cluster} object;
*/
public Cluster register(SchemaChangeListener listener) {
checkNotClosed(manager);
boolean added = manager.schemaChangeListeners.add(listener);
if (added) listener.onRegister(this);
return this;
}
/**
* Unregisters the provided schema change listener from being updated with schema change events.
*
*
This method is a no-op if {@code listener} hasn't previously been registered against this
* Cluster.
*
* @param listener the {@link SchemaChangeListener} to unregister.
* @return this {@code Cluster} object;
*/
public Cluster unregister(SchemaChangeListener listener) {
checkNotClosed(manager);
boolean removed = manager.schemaChangeListeners.remove(listener);
if (removed) listener.onUnregister(this);
return this;
}
/**
* Initiates a shutdown of this cluster instance.
*
*
This method is asynchronous and return a future on the completion of the shutdown process.
* As soon a the cluster is shutdown, no new request will be accepted, but already submitted
* queries are allowed to complete. This method closes all connections from all sessions and
* reclaims all resources used by this Cluster instance.
*
*
If for some reason you wish to expedite this process, the {@link CloseFuture#force} can be
* called on the result future.
*
*
This method has no particular effect if the cluster was already closed (in which case the
* returned future will return immediately).
*
* @return a future on the completion of the shutdown process.
*/
public CloseFuture closeAsync() {
return manager.close();
}
/**
* Initiates a shutdown of this cluster instance and blocks until that shutdown completes.
*
*
This method is a shortcut for {@code closeAsync().get()}.
*/
@Override
public void close() {
try {
closeAsync().get();
} catch (ExecutionException e) {
throw DriverThrowables.propagateCause(e);
} catch (InterruptedException e) {
Thread.currentThread().interrupt();
}
}
/**
* Whether this Cluster instance has been closed.
*
*
Note that this method returns true as soon as one of the close methods ({@link #closeAsync}
* or {@link #close}) has been called, it does not guarantee that the closing is done. If you want
* to guarantee that the closing is done, you can call {@code close()} and wait until it returns
* (or call the get method on {@code closeAsync()} with a very short timeout and check this
* doesn't timeout).
*
* @return {@code true} if this Cluster instance has been closed, {@code false} otherwise.
*/
public boolean isClosed() {
return manager.closeFuture.get() != null;
}
private static void checkNotClosed(Manager manager) {
if (manager.errorDuringInit()) {
throw new IllegalStateException(
"Can't use this cluster instance because it encountered an error in its initialization",
manager.getInitException());
} else if (manager.isClosed()) {
throw new IllegalStateException(
"Can't use this cluster instance because it was previously closed");
}
}
/**
* Initializer for {@link Cluster} instances.
*
*
If you want to create a new {@code Cluster} instance programmatically, then it is advised to
* use {@link Cluster.Builder} which can be obtained from the {@link Cluster#builder} method.
*
*
But it is also possible to implement a custom {@code Initializer} that retrieves
* initialization from a web-service or from a configuration file.
*/
public interface Initializer {
/**
* An optional name for the created cluster.
*
*
Such name is optional (a default name will be created otherwise) and is currently only use
* for JMX reporting of metrics. See {@link Cluster#getClusterName} for more information.
*
* @return the name for the created cluster or {@code null} to use an automatically generated
* name.
*/
public String getClusterName();
/**
* Returns the initial Cassandra hosts to connect to.
*
* @return the initial Cassandra contact points. See {@link Builder#addContactPoint} for more
* details on contact points.
*/
public List getContactPoints();
/**
* The configuration to use for the new cluster.
*
* Note that some configuration can be modified after the cluster initialization but some
* others cannot. In particular, the ones that cannot be changed afterwards includes:
*
*
* - the port use to connect to Cassandra nodes (see {@link ProtocolOptions}).
*
- the policies used (see {@link Policies}).
*
- the authentication info provided (see {@link Configuration}).
*
- whether metrics are enabled (see {@link Configuration}).
*
*
* @return the configuration to use for the new cluster.
*/
public Configuration getConfiguration();
/**
* Optional listeners to register against the newly created cluster.
*
* Note that contrary to listeners registered post Cluster creation, the listeners returned
* by this method will see {@link Host.StateListener#onAdd} events for the initial contact
* points.
*
* @return a possibly empty collection of {@code Host.StateListener} to register against the
* newly created cluster.
*/
public Collection getInitialListeners();
}
/** Helper class to build {@link Cluster} instances. */
public static class Builder implements Initializer {
private String clusterName;
private final List rawHostAndPortContactPoints =
new ArrayList();
private final List rawHostContactPoints = new ArrayList();
private final List contactPoints = new ArrayList();
private int port = ProtocolOptions.DEFAULT_PORT;
private int maxSchemaAgreementWaitSeconds =
ProtocolOptions.DEFAULT_MAX_SCHEMA_AGREEMENT_WAIT_SECONDS;
private ProtocolVersion protocolVersion;
private AuthProvider authProvider = AuthProvider.NONE;
private final Policies.Builder policiesBuilder = Policies.builder();
private final Configuration.Builder configurationBuilder = Configuration.builder();
private ProtocolOptions.Compression compression = ProtocolOptions.Compression.NONE;
private SSLOptions sslOptions = null;
private boolean metricsEnabled = true;
private boolean jmxEnabled = true;
private boolean allowBetaProtocolVersion = false;
private boolean noCompact = false;
private boolean useAdvancedShardAwareness = true;
private boolean schemaQueriesPaged = true;
private int localPortLow = ProtocolOptions.DEFAULT_LOCAL_PORT_LOW;
private int localPortHigh = ProtocolOptions.DEFAULT_LOCAL_PORT_HIGH;
private Collection listeners;
@Override
public String getClusterName() {
return clusterName;
}
@Override
public List getContactPoints() {
// Use a set to remove duplicate endpoints
Set allContactPoints = new LinkedHashSet(contactPoints);
// If contact points were provided as InetAddress/InetSocketAddress, assume the default
// endpoint factory is used.
for (InetAddress address : rawHostContactPoints) {
allContactPoints.add(new TranslatedAddressEndPoint(new InetSocketAddress(address, port)));
}
for (InetSocketAddress socketAddress : rawHostAndPortContactPoints) {
allContactPoints.add(new TranslatedAddressEndPoint(socketAddress));
}
return new ArrayList(allContactPoints);
}
/**
* An optional name for the create cluster.
*
* Note: this is not related to the Cassandra cluster name (though you are free to provide
* the same name). See {@link Cluster#getClusterName} for details.
*
*
If you use this method and create more than one Cluster instance in the same JVM (which
* should be avoided unless you need to connect to multiple Cassandra clusters), you should make
* sure each Cluster instance get a unique name or you may have a problem with JMX reporting.
*
* @param name the cluster name to use for the created Cluster instance.
* @return this Builder.
*/
public Builder withClusterName(String name) {
this.clusterName = name;
return this;
}
/**
* The port to use to connect to the Cassandra host.
*
*
If not set through this method, the default port (9042) will be used instead.
*
* @param port the port to set.
* @return this Builder.
*/
public Builder withPort(int port) {
this.port = port;
return this;
}
/**
* Create cluster connection using latest development protocol version, which is currently in
* beta. Calling this method will result into setting USE_BETA flag in all outgoing messages,
* which allows server to negotiate the supported protocol version even if it is currently in
* beta.
*
*
This feature is only available starting with version {@link ProtocolVersion#V5 V5}.
*
*
Use with caution, refer to the server and protocol documentation for the details on latest
* protocol version.
*
* @return this Builder.
*/
public Builder allowBetaProtocolVersion() {
if (protocolVersion != null)
throw new IllegalArgumentException(
"Can't use beta flag with initial protocol version of " + protocolVersion);
this.allowBetaProtocolVersion = true;
this.protocolVersion = ProtocolVersion.NEWEST_BETA;
return this;
}
/**
* Sets the maximum time to wait for schema agreement before returning from a DDL query.
*
*
If not set through this method, the default value (10 seconds) will be used.
*
* @param maxSchemaAgreementWaitSeconds the new value to set.
* @return this Builder.
* @throws IllegalStateException if the provided value is zero or less.
*/
public Builder withMaxSchemaAgreementWaitSeconds(int maxSchemaAgreementWaitSeconds) {
if (maxSchemaAgreementWaitSeconds <= 0)
throw new IllegalArgumentException("Max schema agreement wait must be greater than zero");
this.maxSchemaAgreementWaitSeconds = maxSchemaAgreementWaitSeconds;
return this;
}
/**
* The native protocol version to use.
*
*
The driver supports versions 1 to 5 of the native protocol. Higher versions of the
* protocol have more features and should be preferred, but this also depends on the Cassandra
* version:
*
*
*
*
* Native protocol version to Cassandra version correspondence
* Protocol version Minimum Cassandra version 1 1.2 2 2.0 3 2.1 4 2.2 5 3.10
*
* By default, the driver will "auto-detect" which protocol version it can use when
* connecting to the first node. More precisely, it will try first with {@link
* ProtocolVersion#DEFAULT}, and if not supported fallback to the highest version supported by
* the first node it connects to. Please note that once the version is "auto-detected", it won't
* change: if the first node the driver connects to is a Cassandra 1.2 node and auto-detection
* is used (the default), then the native protocol version 1 will be use for the lifetime of the
* Cluster instance.
*
*
By using {@link Builder#allowBetaProtocolVersion()}, it is possible to force driver to
* connect to Cassandra node that supports the latest protocol beta version. Leaving this flag
* out will let client to connect with latest released version.
*
*
This method allows to force the use of a particular protocol version. Forcing version 1 is
* always fine since all Cassandra version (at least all those supporting the native protocol in
* the first place) so far support it. However, please note that a number of features of the
* driver won't be available if that version of the protocol is in use, including result set
* paging, {@link BatchStatement}, executing a non-prepared query with binary values ({@link
* Session#execute(String, Object...)}), ... (those methods will throw an
* UnsupportedFeatureException). Using the protocol version 1 should thus only be considered
* when using Cassandra 1.2, until nodes have been upgraded to Cassandra 2.0.
*
*
If version 2 of the protocol is used, then Cassandra 1.2 nodes will be ignored (the driver
* won't connect to them).
*
*
The default behavior (auto-detection) is fine in almost all case, but you may want to
* force a particular version if you have a Cassandra cluster with mixed 1.2/2.0 nodes (i.e.
* during a Cassandra upgrade).
*
* @param version the native protocol version to use. {@code null} is also supported to trigger
* auto-detection (see above) but this is the default (so you don't have to call this method
* for that behavior).
* @return this Builder.
*/
public Builder withProtocolVersion(ProtocolVersion version) {
if (allowBetaProtocolVersion)
throw new IllegalStateException(
"Can not set the version explicitly if `allowBetaProtocolVersion` was used.");
if (version.compareTo(ProtocolVersion.NEWEST_SUPPORTED) > 0)
throw new IllegalArgumentException(
"Can not use "
+ version
+ " protocol version. "
+ "Newest supported protocol version is: "
+ ProtocolVersion.NEWEST_SUPPORTED
+ ". "
+ "For beta versions, use `allowBetaProtocolVersion` instead");
this.protocolVersion = version;
return this;
}
/**
* Adds a contact point - or many if the given address resolves to multiple InetAddress
* s (A records).
*
*
Contact points are addresses of Cassandra nodes that the driver uses to discover the
* cluster topology. Only one contact point is required (the driver will retrieve the address of
* the other nodes automatically), but it is usually a good idea to provide more than one
* contact point, because if that single contact point is unavailable, the driver cannot
* initialize itself correctly.
*
*
Note that by default (that is, unless you use the {@link #withLoadBalancingPolicy}) method
* of this builder), the first successfully contacted host will be used to define the local
* data-center for the client. If follows that if you are running Cassandra in a multiple
* data-center setting, it is a good idea to only provide contact points that are in the same
* datacenter than the client, or to provide manually the load balancing policy that suits your
* need.
*
*
If the host name points to a DNS record with multiple a-records, all InetAddresses
* returned will be used. Make sure that all resulting InetAddresss returned point
* to the same cluster and datacenter.
*
* @param address the address of the node(s) to connect to.
* @return this Builder.
* @throws IllegalArgumentException if the given {@code address} could not be resolved.
* @throws SecurityException if a security manager is present and permission to resolve the host
* name is denied.
*/
public Builder addContactPoint(String address) {
// We explicitly check for nulls because InetAdress.getByName() will happily
// accept it and use localhost (while a null here almost likely mean a user error,
// not "connect to localhost")
if (address == null) throw new NullPointerException();
try {
InetAddress[] allByName = InetAddress.getAllByName(address);
Collections.addAll(this.rawHostContactPoints, allByName);
return this;
} catch (UnknownHostException e) {
throw new IllegalArgumentException("Failed to add contact point: " + address, e);
}
}
/**
* Adds a contact point using the given connection information.
*
*
You only need this method if you use a custom connection mechanism and have configured a
* custom {@link EndPointFactory}; otherwise, you can safely ignore it and use the higher level,
* host-and-port-based variants such as {@link #addContactPoint(String)}.
*/
public Builder addContactPoint(EndPoint contactPoint) {
contactPoints.add(contactPoint);
return this;
}
/**
* Adds contact points.
*
*
See {@link Builder#addContactPoint} for more details on contact points.
*
*
Note that all contact points must be resolvable; if any of them cannot be
* resolved, this method will fail.
*
* @param addresses addresses of the nodes to add as contact points.
* @return this Builder.
* @throws IllegalArgumentException if any of the given {@code addresses} could not be resolved.
* @throws SecurityException if a security manager is present and permission to resolve the host
* name is denied.
* @see Builder#addContactPoint
*/
public Builder addContactPoints(String... addresses) {
for (String address : addresses) addContactPoint(address);
return this;
}
/**
* Adds contact points.
*
*
See {@link Builder#addContactPoint} for more details on contact points.
*
*
Note that all contact points must be resolvable; if any of them cannot be
* resolved, this method will fail.
*
* @param addresses addresses of the nodes to add as contact points.
* @return this Builder.
* @throws IllegalArgumentException if any of the given {@code addresses} could not be resolved.
* @throws SecurityException if a security manager is present and permission to resolve the host
* name is denied.
* @see Builder#addContactPoint
*/
public Builder addContactPoints(InetAddress... addresses) {
Collections.addAll(this.rawHostContactPoints, addresses);
return this;
}
/**
* Adds contact points.
*
*
See {@link Builder#addContactPoint} for more details on contact points.
*
* @param addresses addresses of the nodes to add as contact points.
* @return this Builder
* @see Builder#addContactPoint
*/
public Builder addContactPoints(Collection addresses) {
this.rawHostContactPoints.addAll(addresses);
return this;
}
/**
* Adds contact points.
*
* See {@link Builder#addContactPoint} for more details on contact points. Contrarily to
* other {@code addContactPoints} methods, this method allows to provide a different port for
* each contact point. Since Cassandra nodes must always all listen on the same port, this is
* rarely what you want and most users should prefer other {@code addContactPoints} methods to
* this one. However, this can be useful if the Cassandra nodes are behind a router and are not
* accessed directly. Note that if you are in this situation (Cassandra nodes are behind a
* router, not directly accessible), you almost surely want to provide a specific {@link
* AddressTranslator} (through {@link #withAddressTranslator}) to translate actual Cassandra
* node addresses to the addresses the driver should use, otherwise the driver will not be able
* to auto-detect new nodes (and will generally not function optimally).
*
* @param addresses addresses of the nodes to add as contact points.
* @return this Builder
* @see Builder#addContactPoint
*/
public Builder addContactPointsWithPorts(InetSocketAddress... addresses) {
Collections.addAll(this.rawHostAndPortContactPoints, addresses);
return this;
}
/**
* Adds contact points.
*
*
See {@link Builder#addContactPoint} for more details on contact points. Contrarily to
* other {@code addContactPoints} methods, this method allows to provide a different port for
* each contact point. Since Cassandra nodes must always all listen on the same port, this is
* rarely what you want and most users should prefer other {@code addContactPoints} methods to
* this one. However, this can be useful if the Cassandra nodes are behind a router and are not
* accessed directly. Note that if you are in this situation (Cassandra nodes are behind a
* router, not directly accessible), you almost surely want to provide a specific {@link
* AddressTranslator} (through {@link #withAddressTranslator}) to translate actual Cassandra
* node addresses to the addresses the driver should use, otherwise the driver will not be able
* to auto-detect new nodes (and will generally not function optimally).
*
* @param addresses addresses of the nodes to add as contact points.
* @return this Builder
* @see Builder#addContactPoint
*/
public Builder addContactPointsWithPorts(Collection addresses) {
this.rawHostAndPortContactPoints.addAll(addresses);
return this;
}
/**
* Configures the load balancing policy to use for the new cluster.
*
* If no load balancing policy is set through this method, {@link
* Policies#defaultLoadBalancingPolicy} will be used instead.
*
* @param policy the load balancing policy to use.
* @return this Builder.
*/
public Builder withLoadBalancingPolicy(LoadBalancingPolicy policy) {
policiesBuilder.withLoadBalancingPolicy(policy);
return this;
}
/**
* Configures the reconnection policy to use for the new cluster.
*
*
If no reconnection policy is set through this method, {@link
* Policies#DEFAULT_RECONNECTION_POLICY} will be used instead.
*
* @param policy the reconnection policy to use.
* @return this Builder.
*/
public Builder withReconnectionPolicy(ReconnectionPolicy policy) {
policiesBuilder.withReconnectionPolicy(policy);
return this;
}
/**
* Configures the retry policy to use for the new cluster.
*
*
If no retry policy is set through this method, {@link Policies#DEFAULT_RETRY_POLICY} will
* be used instead.
*
* @param policy the retry policy to use.
* @return this Builder.
*/
public Builder withRetryPolicy(RetryPolicy policy) {
policiesBuilder.withRetryPolicy(policy);
return this;
}
/**
* Configures the address translator to use for the new cluster.
*
*
See {@link AddressTranslator} for more detail on address translation, but the default
* translator, {@link IdentityTranslator}, should be correct in most cases. If unsure, stick to
* the default.
*
* @param translator the translator to use.
* @return this Builder.
*/
public Builder withAddressTranslator(AddressTranslator translator) {
policiesBuilder.withAddressTranslator(translator);
return this;
}
/**
* Configures the generator that will produce the client-side timestamp sent with each query.
*
*
This feature is only available with version {@link ProtocolVersion#V3 V3} or above of the
* native protocol. With earlier versions, timestamps are always generated server-side, and
* setting a generator through this method will have no effect.
*
*
If no generator is set through this method, the driver will default to client-side
* timestamps by using {@link AtomicMonotonicTimestampGenerator}.
*
* @param timestampGenerator the generator to use.
* @return this Builder.
*/
public Builder withTimestampGenerator(TimestampGenerator timestampGenerator) {
policiesBuilder.withTimestampGenerator(timestampGenerator);
return this;
}
/**
* Configures the speculative execution policy to use for the new cluster.
*
*
If no policy is set through this method, {@link
* Policies#defaultSpeculativeExecutionPolicy()} will be used instead.
*
* @param policy the policy to use.
* @return this Builder.
*/
public Builder withSpeculativeExecutionPolicy(SpeculativeExecutionPolicy policy) {
policiesBuilder.withSpeculativeExecutionPolicy(policy);
return this;
}
/**
* Configures the endpoint factory to use for the new cluster.
*
*
This is a low-level component for advanced scenarios where connecting to a node requires
* more than its socket address. If you're simply using host+port, the default factory is
* sufficient.
*/
public Builder withEndPointFactory(EndPointFactory endPointFactory) {
policiesBuilder.withEndPointFactory(endPointFactory);
return this;
}
/**
* Configures the {@link CodecRegistry} instance to use for the new cluster.
*
*
If no codec registry is set through this method, {@link CodecRegistry#DEFAULT_INSTANCE}
* will be used instead.
*
*
Note that if two or more {@link Cluster} instances are configured to use the default codec
* registry, they are going to share the same instance. In this case, care should be taken when
* registering new codecs on it as any codec registered by one cluster would be immediately
* available to others sharing the same default instance.
*
* @param codecRegistry the codec registry to use.
* @return this Builder.
*/
public Builder withCodecRegistry(CodecRegistry codecRegistry) {
configurationBuilder.withCodecRegistry(codecRegistry);
return this;
}
/**
* Uses the provided credentials when connecting to Cassandra hosts.
*
*
This should be used if the Cassandra cluster has been configured to use the {@code
* PasswordAuthenticator}. If the the default {@code AllowAllAuthenticator} is used instead,
* using this method has no effect.
*
* @param username the username to use to login to Cassandra hosts.
* @param password the password corresponding to {@code username}.
* @return this Builder.
*/
public Builder withCredentials(String username, String password) {
this.authProvider = new PlainTextAuthProvider(username, password);
return this;
}
/**
* Use the specified AuthProvider when connecting to Cassandra hosts.
*
*
Use this method when a custom authentication scheme is in place. You shouldn't call both
* this method and {@code withCredentials} on the same {@code Builder} instance as one will
* supersede the other
*
* @param authProvider the {@link AuthProvider} to use to login to Cassandra hosts.
* @return this Builder
*/
public Builder withAuthProvider(AuthProvider authProvider) {
this.authProvider = authProvider;
return this;
}
/**
* Sets the compression to use for the transport.
*
* @param compression the compression to set.
* @return this Builder.
* @see ProtocolOptions.Compression
*/
public Builder withCompression(ProtocolOptions.Compression compression) {
this.compression = compression;
return this;
}
/**
* Disables metrics collection for the created cluster (metrics are enabled by default
* otherwise).
*
* @return this builder.
*/
public Builder withoutMetrics() {
this.metricsEnabled = false;
return this;
}
/**
* Enables the use of SSL for the created {@code Cluster}.
*
*
Calling this method will use the JDK-based implementation with the default options (see
* {@link RemoteEndpointAwareJdkSSLOptions.Builder}). This is thus a shortcut for {@code
* withSSL(JdkSSLOptions.builder().build())}.
*
*
Note that if SSL is enabled, the driver will not connect to any Cassandra nodes that
* doesn't have SSL enabled and it is strongly advised to enable SSL on every Cassandra node if
* you plan on using SSL in the driver.
*
* @return this builder.
*/
public Builder withSSL() {
this.sslOptions = RemoteEndpointAwareJdkSSLOptions.builder().build();
return this;
}
/**
* Enable the use of SSL for the created {@code Cluster} using the provided options.
*
* @param sslOptions the SSL options to use.
* @return this builder.
*/
public Builder withSSL(SSLOptions sslOptions) {
this.sslOptions = sslOptions;
return this;
}
/**
* Register the provided listeners in the newly created cluster.
*
*
Note: repeated calls to this method will override the previous ones.
*
* @param listeners the listeners to register.
* @return this builder.
*/
public Builder withInitialListeners(Collection listeners) {
this.listeners = listeners;
return this;
}
/**
* Disables JMX reporting of the metrics.
*
* JMX reporting is enabled by default (see {@link Metrics}) but can be disabled using this
* option. If metrics are disabled, this is a no-op.
*
* @return this builder.
*/
public Builder withoutJMXReporting() {
this.jmxEnabled = false;
return this;
}
/**
* Sets the PoolingOptions to use for the newly created Cluster.
*
*
If no pooling options are set through this method, default pooling options will be used.
*
* @param options the pooling options to use.
* @return this builder.
*/
public Builder withPoolingOptions(PoolingOptions options) {
configurationBuilder.withPoolingOptions(options);
return this;
}
/**
* Sets the SocketOptions to use for the newly created Cluster.
*
*
If no socket options are set through this method, default socket options will be used.
*
* @param options the socket options to use.
* @return this builder.
*/
public Builder withSocketOptions(SocketOptions options) {
configurationBuilder.withSocketOptions(options);
return this;
}
/**
* Sets the QueryOptions to use for the newly created Cluster.
*
*
If no query options are set through this method, default query options will be used.
*
* @param options the query options to use.
* @return this builder.
*/
public Builder withQueryOptions(QueryOptions options) {
configurationBuilder.withQueryOptions(options);
return this;
}
/**
* Sets the threading options to use for the newly created Cluster.
*
*
If no options are set through this method, a new instance of {@link ThreadingOptions} will
* be used.
*
* @param options the options.
* @return this builder.
*/
public Builder withThreadingOptions(ThreadingOptions options) {
configurationBuilder.withThreadingOptions(options);
return this;
}
/**
* Set the {@link NettyOptions} to use for the newly created Cluster.
*
*
If no Netty options are set through this method, {@link NettyOptions#DEFAULT_INSTANCE}
* will be used as a default value, which means that no customization will be applied.
*
* @param nettyOptions the {@link NettyOptions} to use.
* @return this builder.
*/
public Builder withNettyOptions(NettyOptions nettyOptions) {
configurationBuilder.withNettyOptions(nettyOptions);
return this;
}
/**
* Enables the NO_COMPACT startup option.
*
* When this option is supplied, SELECT, UPDATE, DELETE and
* BATCH statements on COMPACT STORAGE tables function in "compatibility" mode which
* allows seeing these tables as if they were "regular" CQL tables.
*
* This option only effects interactions with tables using COMPACT STORAGE and is only supported by
* C* 4.0+ and DSE 6.0+.
*
* @return this builder.
* @see CASSANDRA-10857
*/
public Builder withNoCompact() {
this.noCompact = true;
return this;
}
public Builder withScyllaCloudConnectionConfig(File configurationFile) throws IOException {
return withScyllaCloudConnectionConfig(configurationFile.toURI().toURL());
}
public Builder withScyllaCloudConnectionConfig(URL configurationUrl) throws IOException {
return withScyllaCloudConnectionConfig(configurationUrl.openStream());
}
public Builder withScyllaCloudConnectionConfig(InputStream inputStream) throws IOException {
return withScyllaCloudConnectionConfig(
ScyllaCloudConnectionConfig.fromInputStream(inputStream));
}
protected Builder withScyllaCloudConnectionConfig(ScyllaCloudConnectionConfig config) {
try {
ScyllaCloudDatacenter currentDatacenter = config.getCurrentDatacenter();
InetSocketAddress proxyAddress = currentDatacenter.getServer();
Builder builder =
withEndPointFactory(
new ScyllaCloudSniEndPointFactory(
proxyAddress, currentDatacenter.getNodeDomain()))
.withSSL(
(config.getCurrentDatacenter().isInsecureSkipTlsVerify()
? config.createBundle().getInsecureSSLOptions()
: config.createBundle().getSSLOptions()))
.withAuthProvider(
new PlainTextAuthProvider(
config.getCurrentAuthInfo().getUsername(),
config.getCurrentAuthInfo().getPassword()))
.withoutAdvancedShardAwareness();
if (builder.rawHostContactPoints.size() > 0
|| builder.rawHostAndPortContactPoints.size() > 0
|| builder.contactPoints.size() > 0) {
throw new IllegalStateException(
"Can't use withCloudSecureConnectBundle if you've already called addContactPoint(s)");
}
builder.addContactPoint(new SniEndPoint(proxyAddress, currentDatacenter.getNodeDomain()));
return builder;
} catch (IOException e) {
throw new IllegalStateException("Cannot construct cloud config", e);
} catch (GeneralSecurityException e) {
throw new IllegalStateException("Cannot construct cloud config", e);
}
}
/**
* Disables advanced shard awareness. By default, this driver chooses local port while making a
* connection to node, to signal which shard it wants to connect to. This allows driver to
* estabilish connection pool faster, especially when there are multiple clients connecting
* concurrently. If this causes any issues, you can disable it using this method. The most
* common issues are the NAT between client and node (which messes up client port numbers) and
* shard aware port (default: 19042) blocked by firewall.
*
* @return this builder.
*/
public Builder withoutAdvancedShardAwareness() {
this.useAdvancedShardAwareness = false;
return this;
}
/**
* Disables paging in schema queries. By default, Queries that fetch schema from the cluster are
* paged. This option causes the least impact on the cluster latencies when a new client
* connects. Turning off paging may result in faster driver initialisation at the expense of
* higher cluster latencies.
*
* @return this builder.
*/
public Builder withoutPagingInSchemaQueries() {
this.schemaQueriesPaged = false;
return this;
}
/**
* Sets local port range for use by advanced shard awareness. Driver will use ports from this
* range as local ports when connecting to cluster. If {@link #withoutAdvancedShardAwareness()}
* was called, then setting this range does not affect anything.
*
* @param low Lower bound of range, inclusive.
* @param high Upper bound of range, inclusive.
* @return this builder.
*/
public Builder withLocalPortRange(int low, int high) {
if (low < 1 || 65535 < low || high < 1 || 65535 < high) {
throw new IllegalArgumentException("Port numbers must be between 1 and 65535");
}
if (high - low < 1000) {
throw new IllegalArgumentException("Port range should be sufficiently large");
}
this.localPortLow = low;
this.localPortHigh = high;
return this;
}
/**
* The configuration that will be used for the new cluster.
*
* You should not modify this object directly because changes made to the returned
* object may not be used by the cluster build. Instead, you should use the other methods of
* this {@code Builder}.
*
* @return the configuration to use for the new cluster.
*/
@Override
public Configuration getConfiguration() {
ProtocolOptions protocolOptions =
new ProtocolOptions(
port,
protocolVersion,
maxSchemaAgreementWaitSeconds,
sslOptions,
authProvider,
noCompact,
useAdvancedShardAwareness,
localPortLow,
localPortHigh)
.setCompression(compression);
MetricsOptions metricsOptions = new MetricsOptions(metricsEnabled, jmxEnabled);
QueryOptions queryOptions = configurationBuilder.getQueryOptions();
if (queryOptions == null) {
queryOptions = new QueryOptions();
}
queryOptions.setSchemaQueriesPaged(schemaQueriesPaged);
return configurationBuilder
.withProtocolOptions(protocolOptions)
.withMetricsOptions(metricsOptions)
.withPolicies(policiesBuilder.build())
.withQueryOptions(queryOptions)
.build();
}
@Override
public Collection getInitialListeners() {
return listeners == null ? Collections.emptySet() : listeners;
}
/**
* Builds the cluster with the configured set of initial contact points and policies.
*
* This is a convenience method for {@code Cluster.buildFrom(this)}.
*
* @return the newly built Cluster instance.
*/
public Cluster build() {
return Cluster.buildFrom(this);
}
}
static long timeSince(long startNanos, TimeUnit destUnit) {
return destUnit.convert(System.nanoTime() - startNanos, TimeUnit.NANOSECONDS);
}
private static String generateClusterName() {
return "cluster" + CLUSTER_ID.incrementAndGet();
}
/**
* The sessions and hosts managed by this a Cluster instance.
*
*
Note: the reason we create a Manager object separate from Cluster is that Manager is not
* publicly visible. For instance, we wouldn't want user to be able to call the {@link #onUp} and
* {@link #onDown} methods.
*/
class Manager implements Connection.DefaultResponseHandler {
final String clusterName;
private volatile boolean isInit;
private volatile boolean isFullyInit;
private Exception initException;
// Initial contacts point
final List contactPoints;
final Set sessions = new CopyOnWriteArraySet();
Metadata metadata;
final Configuration configuration;
Metrics metrics;
Connection.Factory connectionFactory;
ControlConnection controlConnection;
final ConvictionPolicy.Factory convictionPolicyFactory =
new ConvictionPolicy.DefaultConvictionPolicy.Factory();
ListeningExecutorService executor;
ListeningExecutorService blockingExecutor;
ScheduledExecutorService reconnectionExecutor;
ScheduledExecutorService scheduledTasksExecutor;
BlockingQueue executorQueue;
BlockingQueue blockingExecutorQueue;
BlockingQueue reconnectionExecutorQueue;
BlockingQueue scheduledTasksExecutorQueue;
ConnectionReaper reaper;
final AtomicReference closeFuture = new AtomicReference();
// All the queries that have been prepared (we keep them so we can re-prepared them when a node
// fail or a
// new one join the cluster).
// Note: we could move this down to the session level, but since prepared statement are global
// to a node,
// this would yield a slightly less clear behavior.
ConcurrentMap preparedQueries;
final Set listeners;
final Set latencyTrackers = new CopyOnWriteArraySet();
final Set schemaChangeListeners =
new CopyOnWriteArraySet();
EventDebouncer nodeListRefreshRequestDebouncer;
EventDebouncer nodeRefreshRequestDebouncer;
EventDebouncer schemaRefreshRequestDebouncer;
private Manager(
String clusterName,
List contactPoints,
Configuration configuration,
Collection listeners) {
this.clusterName = clusterName == null ? generateClusterName() : clusterName;
if (configuration != null && configuration.getPolicies() != null) {
Policies policies = configuration.getPolicies();
this.configuration =
Configuration.builder()
.withPolicies(
Policies.builder()
.withLoadBalancingPolicy(
new PagingOptimizingLoadBalancingPolicy(
policies.getLoadBalancingPolicy()))
.withEndPointFactory(policies.getEndPointFactory())
.withReconnectionPolicy(policies.getReconnectionPolicy())
.withRetryPolicy(policies.getRetryPolicy())
.withAddressTranslator(policies.getAddressTranslator())
.withTimestampGenerator(policies.getTimestampGenerator())
.withSpeculativeExecutionPolicy(policies.getSpeculativeExecutionPolicy())
.build())
.withProtocolOptions(configuration.getProtocolOptions())
.withPoolingOptions(configuration.getPoolingOptions())
.withSocketOptions(configuration.getSocketOptions())
.withMetricsOptions(configuration.getMetricsOptions())
.withQueryOptions(configuration.getQueryOptions())
.withThreadingOptions(configuration.getThreadingOptions())
.withNettyOptions(configuration.getNettyOptions())
.withCodecRegistry(configuration.getCodecRegistry())
.build();
} else {
this.configuration = configuration;
}
this.contactPoints = contactPoints;
this.listeners = new CopyOnWriteArraySet(listeners);
}
// Initialization is not too performance intensive and in practice there shouldn't be contention
// on it so synchronized is good enough.
synchronized void init() {
checkNotClosed(this);
if (isInit) {
return;
}
isInit = true;
try {
logger.debug("Starting new cluster with contact points " + contactPoints);
this.configuration.register(this);
ThreadingOptions threadingOptions = this.configuration.getThreadingOptions();
// executor
ExecutorService tmpExecutor = threadingOptions.createExecutor(clusterName);
this.executorQueue =
(tmpExecutor instanceof ThreadPoolExecutor)
? ((ThreadPoolExecutor) tmpExecutor).getQueue()
: null;
this.executor = MoreExecutors.listeningDecorator(tmpExecutor);
// blocking executor
ExecutorService tmpBlockingExecutor = threadingOptions.createBlockingExecutor(clusterName);
this.blockingExecutorQueue =
(tmpBlockingExecutor instanceof ThreadPoolExecutor)
? ((ThreadPoolExecutor) tmpBlockingExecutor).getQueue()
: null;
this.blockingExecutor = MoreExecutors.listeningDecorator(tmpBlockingExecutor);
// reconnection executor
this.reconnectionExecutor = threadingOptions.createReconnectionExecutor(clusterName);
this.reconnectionExecutorQueue =
(reconnectionExecutor instanceof ThreadPoolExecutor)
? ((ThreadPoolExecutor) reconnectionExecutor).getQueue()
: null;
// scheduled tasks executor
this.scheduledTasksExecutor = threadingOptions.createScheduledTasksExecutor(clusterName);
this.scheduledTasksExecutorQueue =
(scheduledTasksExecutor instanceof ThreadPoolExecutor)
? ((ThreadPoolExecutor) scheduledTasksExecutor).getQueue()
: null;
this.reaper = new ConnectionReaper(threadingOptions.createReaperExecutor(clusterName));
this.metadata = new Metadata(this);
this.connectionFactory = new Connection.Factory(this, configuration);
this.controlConnection = new ControlConnection(this);
this.metrics = configuration.getMetricsOptions().isEnabled() ? new Metrics(this) : null;
this.preparedQueries = new MapMaker().weakValues().makeMap();
// create debouncers - at this stage, they are not running yet
final QueryOptions queryOptions = configuration.getQueryOptions();
this.nodeListRefreshRequestDebouncer =
new EventDebouncer(
"Node list refresh",
scheduledTasksExecutor,
new NodeListRefreshRequestDeliveryCallback()) {
@Override
int maxPendingEvents() {
return configuration.getQueryOptions().getMaxPendingRefreshNodeListRequests();
}
@Override
long delayMs() {
return configuration.getQueryOptions().getRefreshNodeListIntervalMillis();
}
};
this.nodeRefreshRequestDebouncer =
new EventDebouncer(
"Node refresh", scheduledTasksExecutor, new NodeRefreshRequestDeliveryCallback()) {
@Override
int maxPendingEvents() {
return configuration.getQueryOptions().getMaxPendingRefreshNodeRequests();
}
@Override
long delayMs() {
return configuration.getQueryOptions().getRefreshNodeIntervalMillis();
}
};
this.schemaRefreshRequestDebouncer =
new EventDebouncer(
"Schema refresh",
scheduledTasksExecutor,
new SchemaRefreshRequestDeliveryCallback()) {
@Override
int maxPendingEvents() {
return configuration.getQueryOptions().getMaxPendingRefreshSchemaRequests();
}
@Override
long delayMs() {
return configuration.getQueryOptions().getRefreshSchemaIntervalMillis();
}
};
this.scheduledTasksExecutor.scheduleWithFixedDelay(
new CleanupIdleConnectionsTask(), 10, 10, TimeUnit.SECONDS);
for (EndPoint contactPoint : contactPoints) {
metadata.addContactPoint(contactPoint);
}
// Initialize the control connection:
negotiateProtocolVersionAndConnect();
// The control connection:
// - marked contact points down if they couldn't be reached
// - triggered an initial full refresh of metadata.allHosts. If any contact points weren't
// valid, they won't appear in it.
Set downContactPointHosts = Sets.newHashSet();
Set removedContactPointHosts = Sets.newHashSet();
for (Host contactPoint : metadata.getContactPoints()) {
if (!metadata.allHosts().contains(contactPoint)) {
removedContactPointHosts.add(contactPoint);
} else if (contactPoint.state == Host.State.DOWN) {
downContactPointHosts.add(contactPoint);
}
}
// Now that the control connection is ready, we have all the information we need about the
// nodes (datacenter, rack...) to initialize the load balancing policy
Set lbpContactPoints = Sets.newHashSet(metadata.getContactPoints());
lbpContactPoints.removeAll(removedContactPointHosts);
lbpContactPoints.removeAll(downContactPointHosts);
loadBalancingPolicy().init(Cluster.this, lbpContactPoints);
speculativeExecutionPolicy().init(Cluster.this);
configuration.getPolicies().getRetryPolicy().init(Cluster.this);
reconnectionPolicy().init(Cluster.this);
configuration.getPolicies().getAddressTranslator().init(Cluster.this);
for (LatencyTracker tracker : latencyTrackers) tracker.onRegister(Cluster.this);
for (Host.StateListener listener : listeners) listener.onRegister(Cluster.this);
for (Host host : removedContactPointHosts) {
loadBalancingPolicy().onRemove(host);
for (Host.StateListener listener : listeners) listener.onRemove(host);
}
for (Host host : downContactPointHosts) {
loadBalancingPolicy().onDown(host);
for (Host.StateListener listener : listeners) listener.onDown(host);
startPeriodicReconnectionAttempt(host, true);
}
configuration.getPoolingOptions().setProtocolVersion(protocolVersion());
for (Host host : metadata.allHosts()) {
// If the host is down at this stage, it's a contact point that the control connection
// failed to reach.
// Reconnection attempts are already scheduled, and the LBP and listeners have been
// notified above.
if (host.state == Host.State.DOWN) continue;
// Otherwise, we want to do the equivalent of onAdd(). But since we know for sure that no
// sessions or prepared
// statements exist at this point, we can skip some of the steps (plus this avoids
// scheduling concurrent pool
// creations if a session is created right after this method returns).
logger.info("New Cassandra host {} added", host);
if (!host.supports(connectionFactory.protocolVersion)) {
logUnsupportedVersionProtocol(host, connectionFactory.protocolVersion);
continue;
}
if (!lbpContactPoints.contains(host)) loadBalancingPolicy().onAdd(host);
host.setUp();
for (Host.StateListener listener : listeners) listener.onAdd(host);
}
// start debouncers
this.nodeListRefreshRequestDebouncer.start();
this.schemaRefreshRequestDebouncer.start();
this.nodeRefreshRequestDebouncer.start();
isFullyInit = true;
} catch (RuntimeException e) {
initException = e;
close();
throw e;
}
}
private void negotiateProtocolVersionAndConnect() {
boolean shouldNegotiate =
(configuration.getProtocolOptions().initialProtocolVersion == null
|| shouldAlwaysNegotiateProtocolVersion);
while (true) {
try {
controlConnection.connect();
return;
} catch (UnsupportedProtocolVersionException e) {
if (!shouldNegotiate) {
throw e;
}
// Do not trust version of server's response, as C* behavior in case of protocol
// negotiation is not
// properly documented, and varies over time (specially after CASSANDRA-11464). Instead,
// always
// retry at attempted version - 1, if such a version exists; and otherwise, stop and fail.
ProtocolVersion attemptedVersion = e.getUnsupportedVersion();
ProtocolVersion retryVersion = attemptedVersion.getLowerSupported();
if (retryVersion == null) {
throw e;
}
logger.info(
"Cannot connect with protocol version {}, trying with {}",
attemptedVersion,
retryVersion);
connectionFactory.protocolVersion = retryVersion;
}
}
}
ProtocolVersion protocolVersion() {
return connectionFactory.protocolVersion;
}
Cluster getCluster() {
return Cluster.this;
}
LoadBalancingPolicy loadBalancingPolicy() {
return configuration.getPolicies().getLoadBalancingPolicy();
}
SpeculativeExecutionPolicy speculativeExecutionPolicy() {
return configuration.getPolicies().getSpeculativeExecutionPolicy();
}
ReconnectionPolicy reconnectionPolicy() {
return configuration.getPolicies().getReconnectionPolicy();
}
InetSocketAddress translateAddress(InetSocketAddress address) {
InetSocketAddress translated =
configuration.getPolicies().getAddressTranslator().translate(address);
return translated == null ? address : translated;
}
InetSocketAddress translateAddress(InetAddress address) {
InetSocketAddress sa = new InetSocketAddress(address, connectionFactory.getPort());
return translateAddress(sa);
}
private Session newSession() {
SessionManager session = new SessionManager(Cluster.this);
sessions.add(session);
return session;
}
boolean removeSession(Session session) {
return sessions.remove(session);
}
void reportQuery(Host host, Statement statement, Exception exception, long latencyNanos) {
for (LatencyTracker tracker : latencyTrackers) {
try {
tracker.update(host, statement, exception, latencyNanos);
} catch (Exception e) {
logger.error("Call to latency tracker failed", e);
}
}
}
ControlConnection getControlConnection() {
return controlConnection;
}
List getContactPoints() {
return contactPoints;
}
boolean isClosed() {
return closeFuture.get() != null;
}
boolean errorDuringInit() {
return (isInit && initException != null);
}
Exception getInitException() {
return initException;
}
private CloseFuture close() {
CloseFuture future = closeFuture.get();
if (future != null) return future;
if (isInit) {
logger.debug("Shutting down");
// stop debouncers
if (nodeListRefreshRequestDebouncer != null) {
nodeListRefreshRequestDebouncer.stop();
}
if (nodeRefreshRequestDebouncer != null) {
nodeRefreshRequestDebouncer.stop();
}
if (schemaRefreshRequestDebouncer != null) {
schemaRefreshRequestDebouncer.stop();
}
// If we're shutting down, there is no point in waiting on scheduled reconnections, nor on
// notifications
// delivery or blocking tasks so we use shutdownNow
shutdownNow(reconnectionExecutor);
shutdownNow(scheduledTasksExecutor);
shutdownNow(blockingExecutor);
// but for the worker executor, we want to let submitted tasks finish unless the shutdown is
// forced.
if (executor != null) {
executor.shutdown();
}
// We also close the metrics
if (metrics != null) metrics.shutdown();
loadBalancingPolicy().close();
speculativeExecutionPolicy().close();
configuration.getPolicies().getRetryPolicy().close();
reconnectionPolicy().close();
configuration.getPolicies().getAddressTranslator().close();
for (LatencyTracker tracker : latencyTrackers) tracker.onUnregister(Cluster.this);
for (Host.StateListener listener : listeners) listener.onUnregister(Cluster.this);
for (SchemaChangeListener listener : schemaChangeListeners)
listener.onUnregister(Cluster.this);
// Then we shutdown all connections
List futures = new ArrayList(sessions.size() + 1);
if (controlConnection != null) {
futures.add(controlConnection.closeAsync());
}
for (Session session : sessions) futures.add(session.closeAsync());
future = new ClusterCloseFuture(futures);
// The rest will happen asynchronously, when all connections are successfully closed
} else {
future = CloseFuture.immediateFuture();
}
return closeFuture.compareAndSet(null, future)
? future
: closeFuture.get(); // We raced, it's ok, return the future that was actually set
}
private void shutdownNow(ExecutorService executor) {
if (executor != null) {
List pendingTasks = executor.shutdownNow();
// If some tasks were submitted to this executor but not yet commenced, make sure the
// corresponding futures complete
for (Runnable pendingTask : pendingTasks) {
if (pendingTask instanceof FutureTask) ((FutureTask) pendingTask).cancel(false);
}
}
}
void logUnsupportedVersionProtocol(Host host, ProtocolVersion version) {
logger.warn(
"Detected added or restarted Cassandra host {} but ignoring it since it does not support the version {} of the native "
+ "protocol which is currently in use. If you want to force the use of a particular version of the native protocol, use "
+ "Cluster.Builder#usingProtocolVersion() when creating the Cluster instance.",
host,
version);
}
void logClusterNameMismatch(Host host, String expectedClusterName, String actualClusterName) {
logger.warn(
"Detected added or restarted Cassandra host {} but ignoring it since its cluster name '{}' does not match the one "
+ "currently known ({})",
host,
actualClusterName,
expectedClusterName);
}
public ListenableFuture triggerOnUp(final Host host) {
if (!isClosed()) {
return executor.submit(
new ExceptionCatchingRunnable() {
@Override
public void runMayThrow() throws InterruptedException, ExecutionException {
onUp(host, null);
}
});
} else {
return MoreFutures.VOID_SUCCESS;
}
}
// Use triggerOnUp unless you're sure you want to run this on the current thread.
private void onUp(final Host host, Connection reusedConnection)
throws InterruptedException, ExecutionException {
if (isClosed()) return;
if (!host.supports(connectionFactory.protocolVersion)) {
logUnsupportedVersionProtocol(host, connectionFactory.protocolVersion);
return;
}
try {
boolean locked =
host.notificationsLock.tryLock(NOTIF_LOCK_TIMEOUT_SECONDS, TimeUnit.SECONDS);
if (!locked) {
logger.warn(
"Could not acquire notifications lock within {} seconds, ignoring UP notification for {}",
NOTIF_LOCK_TIMEOUT_SECONDS,
host);
return;
}
try {
// We don't want to use the public Host.isUp() as this would make us skip the rest for
// suspected hosts
if (host.state == Host.State.UP) return;
Host.statesLogger.debug("[{}] marking host UP", host);
// If there is a reconnection attempt scheduled for that node, cancel it
Future scheduledAttempt = host.reconnectionAttempt.getAndSet(null);
if (scheduledAttempt != null) {
logger.debug("Cancelling reconnection attempt since node is UP");
scheduledAttempt.cancel(false);
}
try {
if (getCluster().getConfiguration().getQueryOptions().isReprepareOnUp())
reusedConnection = prepareAllQueries(host, reusedConnection);
} catch (InterruptedException e) {
Thread.currentThread().interrupt();
// Don't propagate because we don't want to prevent other listener to run
} catch (UnsupportedProtocolVersionException e) {
logUnsupportedVersionProtocol(host, e.getUnsupportedVersion());
return;
} catch (ClusterNameMismatchException e) {
logClusterNameMismatch(host, e.expectedClusterName, e.actualClusterName);
return;
}
// Session#onUp() expects the load balancing policy to have been updated first, so that
// Host distances are up to date. This mean the policy could return the node before the
// new pool have been created. This is harmless if there is no prior pool since
// RequestHandler
// will ignore the node, but we do want to make sure there is no prior pool so we don't
// query from a pool we will shutdown right away.
for (SessionManager s : sessions) s.removePool(host);
loadBalancingPolicy().onUp(host);
controlConnection.onUp(host);
logger.trace("Adding/renewing host pools for newly UP host {}", host);
List> futures = Lists.newArrayListWithCapacity(sessions.size());
for (SessionManager s : sessions) futures.add(s.forceRenewPool(host, reusedConnection));
try {
// Only mark the node up once all session have re-added their pool (if the
// load-balancing
// policy says it should), so that Host.isUp() don't return true before we're
// reconnected
// to the node.
List poolCreationResults = Futures.allAsList(futures).get();
// If any of the creation failed, they will have signaled a connection failure
// which will trigger a reconnection to the node. So don't bother marking UP.
if (Iterables.any(poolCreationResults, Predicates.equalTo(false))) {
logger.debug("Connection pool cannot be created, not marking {} UP", host);
return;
}
host.setUp();
for (Host.StateListener listener : listeners) listener.onUp(host);
} catch (ExecutionException e) {
Throwable t = e.getCause();
// That future is not really supposed to throw unexpected exceptions
if (!(t instanceof InterruptedException) && !(t instanceof CancellationException))
logger.error(
"Unexpected error while marking node UP: while this shouldn't happen, this shouldn't be critical",
t);
}
// Now, check if there isn't pools to create/remove following the addition.
// We do that now only so that it's not called before we've set the node up.
for (SessionManager s : sessions) s.updateCreatedPools().get();
} finally {
host.notificationsLock.unlock();
}
} finally {
if (reusedConnection != null && !reusedConnection.hasOwner()) reusedConnection.closeAsync();
}
}
public ListenableFuture triggerOnDown(final Host host, boolean startReconnection) {
return triggerOnDown(host, false, startReconnection);
}
public ListenableFuture triggerOnDown(
final Host host, final boolean isHostAddition, final boolean startReconnection) {
if (!isClosed()) {
return executor.submit(
new ExceptionCatchingRunnable() {
@Override
public void runMayThrow() throws InterruptedException, ExecutionException {
onDown(host, isHostAddition, startReconnection);
}
});
} else {
return MoreFutures.VOID_SUCCESS;
}
}
// Use triggerOnDown unless you're sure you want to run this on the current thread.
private void onDown(final Host host, final boolean isHostAddition, boolean startReconnection)
throws InterruptedException, ExecutionException {
if (isClosed()) return;
boolean locked = host.notificationsLock.tryLock(NOTIF_LOCK_TIMEOUT_SECONDS, TimeUnit.SECONDS);
if (!locked) {
logger.warn(
"Could not acquire notifications lock within {} seconds, ignoring DOWN notification for {}",
NOTIF_LOCK_TIMEOUT_SECONDS,
host);
return;
}
try {
// Note: we don't want to skip that method if !host.isUp() because we set isUp
// late in onUp, and so we can rely on isUp if there is an error during onUp.
// But if there is a reconnection attempt in progress already, then we know
// we've already gone through that method since the last successful onUp(), so
// we're good skipping it.
if (host.reconnectionAttempt.get() != null) {
logger.debug("Aborting onDown because a reconnection is running on DOWN host {}", host);
return;
}
Host.statesLogger.debug("[{}] marking host DOWN", host);
// Remember if we care about this node at all. We must call this before
// we've signalled the load balancing policy, since most policy will always
// IGNORE down nodes anyway.
HostDistance distance = loadBalancingPolicy().distance(host);
boolean wasUp = host.isUp();
host.setDown();
loadBalancingPolicy().onDown(host);
controlConnection.onDown(host);
for (SessionManager s : sessions) s.onDown(host);
// Contrarily to other actions of that method, there is no reason to notify listeners
// unless the host was UP at the beginning of this function since even if a onUp fail
// mid-method, listeners won't have been notified of the UP.
if (wasUp) {
for (Host.StateListener listener : listeners) listener.onDown(host);
}
// Don't start a reconnection if we ignore the node anyway (JAVA-314)
if (distance == HostDistance.IGNORED || !startReconnection) return;
startPeriodicReconnectionAttempt(host, isHostAddition);
} finally {
host.notificationsLock.unlock();
}
}
void startPeriodicReconnectionAttempt(final Host host, final boolean isHostAddition) {
new AbstractReconnectionHandler(
host.toString(),
reconnectionExecutor,
reconnectionPolicy().newSchedule(),
host.reconnectionAttempt) {
@Override
protected Connection tryReconnect()
throws ConnectionException, InterruptedException, UnsupportedProtocolVersionException,
ClusterNameMismatchException {
return connectionFactory.open(host);
}
@Override
protected void onReconnection(Connection connection) {
// Make sure we have up-to-date infos on that host before adding it (so we typically
// catch that an upgraded node uses a new cassandra version).
if (controlConnection.refreshNodeInfo(host)) {
logger.debug("Successful reconnection to {}, setting host UP", host);
try {
if (isHostAddition) {
onAdd(host, connection);
submitNodeListRefresh();
} else onUp(host, connection);
} catch (InterruptedException e) {
Thread.currentThread().interrupt();
} catch (Exception e) {
logger.error("Unexpected error while setting node up", e);
}
} else {
logger.debug("Not enough info for {}, ignoring host", host);
connection.closeAsync();
}
}
@Override
protected boolean onConnectionException(ConnectionException e, long nextDelayMs) {
if (logger.isDebugEnabled())
logger.debug(
"Failed reconnection to {} ({}), scheduling retry in {} milliseconds",
host,
e.getMessage(),
nextDelayMs);
return true;
}
@Override
protected boolean onUnknownException(Exception e, long nextDelayMs) {
logger.error(
String.format(
"Unknown error during reconnection to %s, scheduling retry in %d milliseconds",
host, nextDelayMs),
e);
return true;
}
@Override
protected boolean onAuthenticationException(AuthenticationException e, long nextDelayMs) {
logger.error(
String.format(
"Authentication error during reconnection to %s, scheduling retry in %d milliseconds",
host, nextDelayMs),
e);
return true;
}
}.start();
}
void startSingleReconnectionAttempt(final Host host) {
if (isClosed() || host.isUp()) return;
logger.debug("Scheduling one-time reconnection to {}", host);
// Setting an initial delay of 0 to start immediately, and all the exception handlers return
// false to prevent further attempts
new AbstractReconnectionHandler(
host.toString(),
reconnectionExecutor,
reconnectionPolicy().newSchedule(),
host.reconnectionAttempt,
0) {
@Override
protected Connection tryReconnect()
throws ConnectionException, InterruptedException, UnsupportedProtocolVersionException,
ClusterNameMismatchException {
return connectionFactory.open(host);
}
@Override
protected void onReconnection(Connection connection) {
// Make sure we have up-to-date infos on that host before adding it (so we typically
// catch that an upgraded node uses a new cassandra version).
if (controlConnection.refreshNodeInfo(host)) {
logger.debug("Successful reconnection to {}, setting host UP", host);
try {
onUp(host, connection);
} catch (InterruptedException e) {
Thread.currentThread().interrupt();
} catch (Exception e) {
logger.error("Unexpected error while setting node up", e);
}
} else {
logger.debug("Not enough info for {}, ignoring host", host);
connection.closeAsync();
}
}
@Override
protected boolean onConnectionException(ConnectionException e, long nextDelayMs) {
if (logger.isDebugEnabled())
logger.debug("Failed one-time reconnection to {} ({})", host, e.getMessage());
return false;
}
@Override
protected boolean onUnknownException(Exception e, long nextDelayMs) {
logger.error(String.format("Unknown error during one-time reconnection to %s", host), e);
return false;
}
@Override
protected boolean onAuthenticationException(AuthenticationException e, long nextDelayMs) {
logger.error(
String.format("Authentication error during one-time reconnection to %s", host), e);
return false;
}
}.start();
}
public ListenableFuture triggerOnAdd(final Host host) {
if (!isClosed()) {
return executor.submit(
new ExceptionCatchingRunnable() {
@Override
public void runMayThrow() throws InterruptedException, ExecutionException {
onAdd(host, null);
}
});
} else {
return MoreFutures.VOID_SUCCESS;
}
}
// Use triggerOnAdd unless you're sure you want to run this on the current thread.
private void onAdd(final Host host, Connection reusedConnection)
throws InterruptedException, ExecutionException {
if (isClosed()) return;
if (!host.supports(connectionFactory.protocolVersion)) {
logUnsupportedVersionProtocol(host, connectionFactory.protocolVersion);
return;
}
try {
boolean locked =
host.notificationsLock.tryLock(NOTIF_LOCK_TIMEOUT_SECONDS, TimeUnit.SECONDS);
if (!locked) {
logger.warn(
"Could not acquire notifications lock within {} seconds, ignoring ADD notification for {}",
NOTIF_LOCK_TIMEOUT_SECONDS,
host);
return;
}
try {
Host.statesLogger.debug("[{}] adding host", host);
// Adds to the load balancing first and foremost, as doing so might change the decision
// it will make for distance() on that node (not likely but we leave that possibility).
// This does mean the policy may start returning that node for query plan, but as long
// as no pools have been created (below) this will be ignored by RequestHandler so it's
// fine.
loadBalancingPolicy().onAdd(host);
// Next, if the host should be ignored, well, ignore it.
if (loadBalancingPolicy().distance(host) == HostDistance.IGNORED) {
// We still mark the node UP though as it should be (and notifiy the listeners).
// We'll mark it down if we have a notification anyway and we've documented that
// especially
// for IGNORED hosts, the isUp() method was a best effort guess
host.setUp();
for (Host.StateListener listener : listeners) listener.onAdd(host);
return;
}
try {
reusedConnection = prepareAllQueries(host, reusedConnection);
} catch (InterruptedException e) {
Thread.currentThread().interrupt();
// Don't propagate because we don't want to prevent other listener to run
} catch (UnsupportedProtocolVersionException e) {
logUnsupportedVersionProtocol(host, e.getUnsupportedVersion());
return;
} catch (ClusterNameMismatchException e) {
logClusterNameMismatch(host, e.expectedClusterName, e.actualClusterName);
return;
}
controlConnection.onAdd(host);
List> futures = Lists.newArrayListWithCapacity(sessions.size());
for (SessionManager s : sessions) futures.add(s.maybeAddPool(host, reusedConnection));
try {
// Only mark the node up once all session have added their pool (if the load-balancing
// policy says it should), so that Host.isUp() don't return true before we're
// reconnected
// to the node.
List poolCreationResults = Futures.allAsList(futures).get();
// If any of the creation failed, they will have signaled a connection failure
// which will trigger a reconnection to the node. So don't bother marking UP.
if (Iterables.any(poolCreationResults, Predicates.equalTo(false))) {
logger.debug("Connection pool cannot be created, not marking {} UP", host);
return;
}
host.setUp();
for (Host.StateListener listener : listeners) listener.onAdd(host);
} catch (ExecutionException e) {
Throwable t = e.getCause();
// That future is not really supposed to throw unexpected exceptions
if (!(t instanceof InterruptedException) && !(t instanceof CancellationException))
logger.error(
"Unexpected error while adding node: while this shouldn't happen, this shouldn't be critical",
t);
}
// Now, check if there isn't pools to create/remove following the addition.
// We do that now only so that it's not called before we've set the node up.
for (SessionManager s : sessions) s.updateCreatedPools().get();
} finally {
host.notificationsLock.unlock();
}
} finally {
if (reusedConnection != null && !reusedConnection.hasOwner()) reusedConnection.closeAsync();
}
}
public ListenableFuture triggerOnRemove(final Host host) {
if (!isClosed()) {
return executor.submit(
new ExceptionCatchingRunnable() {
@Override
public void runMayThrow() throws InterruptedException, ExecutionException {
onRemove(host);
}
});
} else {
return MoreFutures.VOID_SUCCESS;
}
}
// Use triggerOnRemove unless you're sure you want to run this on the current thread.
private void onRemove(Host host) throws InterruptedException, ExecutionException {
if (isClosed()) return;
boolean locked = host.notificationsLock.tryLock(NOTIF_LOCK_TIMEOUT_SECONDS, TimeUnit.SECONDS);
if (!locked) {
logger.warn(
"Could not acquire notifications lock within {} seconds, ignoring REMOVE notification for {}",
NOTIF_LOCK_TIMEOUT_SECONDS,
host);
return;
}
try {
host.setDown();
Host.statesLogger.debug("[{}] removing host", host);
loadBalancingPolicy().onRemove(host);
controlConnection.onRemove(host);
for (SessionManager s : sessions) s.onRemove(host);
for (Host.StateListener listener : listeners) listener.onRemove(host);
} finally {
host.notificationsLock.unlock();
}
}
public void signalHostDown(Host host, boolean isHostAddition) {
// Don't mark the node down until we've fully initialized the controlConnection as this might
// mess up with
// the protocol detection
if (!isFullyInit || isClosed()) return;
triggerOnDown(host, isHostAddition, true);
}
public void removeHost(Host host, boolean isInitialConnection) {
if (host == null) return;
if (metadata.remove(host)) {
if (isInitialConnection) {
logger.warn(
"You listed {} in your contact points, but it wasn't found in the control host's system.peers at startup",
host);
} else {
logger.info("Cassandra host {} removed", host);
triggerOnRemove(host);
}
}
}
public void ensurePoolsSizing() {
if (protocolVersion().compareTo(ProtocolVersion.V3) >= 0) return;
for (SessionManager session : sessions) {
for (HostConnectionPool pool : session.pools.values()) pool.ensureCoreConnections();
}
}
public PreparedStatement addPrepared(PreparedStatement stmt) {
PreparedStatement previous =
preparedQueries.putIfAbsent(stmt.getPreparedId().boundValuesMetadata.id, stmt);
if (previous != null) {
logger.warn(
"Re-preparing already prepared query is generally an anti-pattern and will likely affect performance. "
+ "Consider preparing the statement only once. Query='{}'",
stmt.getQueryString());
// The one object in the cache will get GCed once it's not referenced by the client anymore
// since we use a weak reference.
// So we need to make sure that the instance we do return to the user is the one that is in
// the cache.
// However if the result metadata changed since the last PREPARE call, this also needs to be
// updated.
previous.getPreparedId().resultSetMetadata = stmt.getPreparedId().resultSetMetadata;
return previous;
}
return stmt;
}
/**
* @param reusedConnection an existing connection (from a reconnection attempt) that we want to
* reuse to prepare the statements (might be null).
* @return a connection that the rest of the initialization process can use (it will be made
* part of a connection pool). Can be reusedConnection, or one that was open in the method.
*/
private Connection prepareAllQueries(Host host, Connection reusedConnection)
throws InterruptedException, UnsupportedProtocolVersionException,
ClusterNameMismatchException {
if (preparedQueries.isEmpty()) return reusedConnection;
logger.debug(
"Preparing {} prepared queries on newly up node {}", preparedQueries.size(), host);
Connection connection = null;
try {
connection = (reusedConnection == null) ? connectionFactory.open(host) : reusedConnection;
// Furthermore, along with each prepared query we keep the current keyspace at the time of
// preparation
// as we need to make it is the same when we re-prepare on new/restarted nodes. Most query
// will use the
// same keyspace so keeping it each time is slightly wasteful, but this doesn't really
// matter and is
// simpler. Besides, we do avoid in prepareAllQueries to not set the current keyspace more
// than needed.
// We need to make sure we prepared every query with the right current keyspace, i.e. the
// one originally
// used for preparing it. However, since we are likely that all prepared query belong to
// only a handful
// of different keyspace (possibly only one), and to avoid setting the current keyspace more
// than needed,
// we first sort the query per keyspace.
SetMultimap perKeyspace = HashMultimap.create();
for (PreparedStatement ps : preparedQueries.values()) {
// It's possible for a query to not have a current keyspace. But since null doesn't work
// well as
// map keys, we use the empty string instead (that is not a valid keyspace name).
String keyspace = ps.getQueryKeyspace() == null ? "" : ps.getQueryKeyspace();
perKeyspace.put(keyspace, ps.getQueryString());
}
for (String keyspace : perKeyspace.keySet()) {
// Empty string mean no particular keyspace to set
if (!keyspace.isEmpty()) connection.setKeyspace(keyspace);
List futures =
new ArrayList(preparedQueries.size());
for (String query : perKeyspace.get(keyspace)) {
futures.add(connection.write(new Requests.Prepare(query)));
}
for (Connection.Future future : futures) {
try {
future.get();
} catch (ExecutionException e) {
// This "might" happen if we drop a CF but haven't removed it's prepared queries
// (which we don't do
// currently). It's not a big deal however as if it's a more serious problem it'll
// show up later when
// the query is tried for execution.
logger.debug("Unexpected error while preparing queries on new/newly up host", e);
}
}
}
return connection;
} catch (ConnectionException e) {
// Ignore, not a big deal
if (connection != null) connection.closeAsync();
return null;
} catch (AuthenticationException e) {
// That's a bad news, but ignore at this point
if (connection != null) connection.closeAsync();
return null;
} catch (BusyConnectionException e) {
// Ignore, not a big deal
// In theory the problem is transient so the connection could be reused later, but if the
// core pool size is 1
// it's better to close this one so that we start with a fresh connection.
if (connection != null) connection.closeAsync();
return null;
}
}
ListenableFuture submitSchemaRefresh(
final SchemaElement targetType,
final String targetKeyspace,
final String targetName,
final List targetSignature) {
SchemaRefreshRequest request =
new SchemaRefreshRequest(targetType, targetKeyspace, targetName, targetSignature);
logger.trace("Submitting schema refresh: {}", request);
return schemaRefreshRequestDebouncer.eventReceived(request);
}
ListenableFuture submitNodeListRefresh() {
logger.trace("Submitting node list and token map refresh");
return nodeListRefreshRequestDebouncer.eventReceived(new NodeListRefreshRequest());
}
ListenableFuture submitNodeRefresh(InetSocketAddress address, HostEvent eventType) {
NodeRefreshRequest request = new NodeRefreshRequest(address, eventType);
logger.trace("Submitting node refresh: {}", request);
return nodeRefreshRequestDebouncer.eventReceived(request);
}
// refresh the schema using the provided connection, and notice the future with the provided
// resultset once done
public void refreshSchemaAndSignal(
final Connection connection,
final DefaultResultSetFuture future,
final ResultSet rs,
final SchemaElement targetType,
final String targetKeyspace,
final String targetName,
final List targetSignature) {
if (logger.isDebugEnabled())
logger.debug(
"Refreshing schema for {}{}",
targetType == null ? "everything" : targetKeyspace,
(targetType == KEYSPACE) ? "" : "." + targetName + " (" + targetType + ")");
maybeRefreshSchemaAndSignal(
connection, future, rs, targetType, targetKeyspace, targetName, targetSignature);
}
public void waitForSchemaAgreementAndSignal(
final Connection connection, final DefaultResultSetFuture future, final ResultSet rs) {
maybeRefreshSchemaAndSignal(connection, future, rs, null, null, null, null);
}
private void maybeRefreshSchemaAndSignal(
final Connection connection,
final DefaultResultSetFuture future,
final ResultSet rs,
final SchemaElement targetType,
final String targetKeyspace,
final String targetName,
final List targetSignature) {
final boolean refreshSchema =
(targetKeyspace != null); // if false, only wait for schema agreement
executor.submit(
new Runnable() {
@Override
public void run() {
boolean schemaInAgreement = false;
try {
// Before refreshing the schema, wait for schema agreement so
// that querying a table just after having created it don't fail.
schemaInAgreement =
ControlConnection.waitForSchemaAgreement(connection, Cluster.Manager.this);
if (!schemaInAgreement)
logger.warn(
"No schema agreement from live replicas after {} s. The schema may not be up to date on some nodes.",
configuration.getProtocolOptions().getMaxSchemaAgreementWaitSeconds());
ListenableFuture schemaReady;
if (refreshSchema) {
schemaReady =
submitSchemaRefresh(targetType, targetKeyspace, targetName, targetSignature);
// JAVA-1120: skip debouncing delay and force immediate delivery
if (!schemaReady.isDone())
schemaRefreshRequestDebouncer.scheduleImmediateDelivery();
} else {
schemaReady = MoreFutures.VOID_SUCCESS;
}
final boolean finalSchemaInAgreement = schemaInAgreement;
schemaReady.addListener(
new Runnable() {
@Override
public void run() {
rs.getExecutionInfo().setSchemaInAgreement(finalSchemaInAgreement);
future.setResult(rs);
}
},
GuavaCompatibility.INSTANCE.sameThreadExecutor());
} catch (Exception e) {
logger.warn("Error while waiting for schema agreement", e);
// This is not fatal, complete the future anyway
rs.getExecutionInfo().setSchemaInAgreement(schemaInAgreement);
future.setResult(rs);
}
}
});
}
// Called when some message has been received but has been initiated from the server (streamId <
// 0).
// This is called on an I/O thread, so all blocking operation must be done on an executor.
@Override
public void handle(Message.Response response) {
if (!(response instanceof Responses.Event)) {
logger.error("Received an unexpected message from the server: {}", response);
return;
}
final ProtocolEvent event = ((Responses.Event) response).event;
logger.debug("Received event {}, scheduling delivery", response);
switch (event.type) {
case TOPOLOGY_CHANGE:
ProtocolEvent.TopologyChange tpc = (ProtocolEvent.TopologyChange) event;
Host.statesLogger.debug("[{}] received event {}", tpc.node, tpc.change);
// Do NOT translate the address, it will be matched against Host.getBroadcastRpcAddress()
// to find the target host.
switch (tpc.change) {
case REMOVED_NODE:
submitNodeRefresh(tpc.node, HostEvent.REMOVED);
break;
default:
// If a node was added, we don't have enough information to create a new Host (we are
// missing it's ID) so trigger a full refresh
submitNodeListRefresh();
break;
}
break;
case STATUS_CHANGE:
ProtocolEvent.StatusChange stc = (ProtocolEvent.StatusChange) event;
Host.statesLogger.debug("[{}] received event {}", stc.node, stc.status);
// Do NOT translate the address, it will be matched against Host.getBroadcastRpcAddress()
// to find the target host.
switch (stc.status) {
case UP:
submitNodeRefresh(stc.node, HostEvent.UP);
break;
case DOWN:
submitNodeRefresh(stc.node, HostEvent.DOWN);
break;
}
break;
case SCHEMA_CHANGE:
if (!configuration.getQueryOptions().isMetadataEnabled()) return;
ProtocolEvent.SchemaChange scc = (ProtocolEvent.SchemaChange) event;
switch (scc.change) {
case CREATED:
case UPDATED:
submitSchemaRefresh(
scc.targetType, scc.targetKeyspace, scc.targetName, scc.targetSignature);
break;
case DROPPED:
if (scc.targetType == KEYSPACE) {
final KeyspaceMetadata removedKeyspace =
manager.metadata.removeKeyspace(scc.targetKeyspace);
if (removedKeyspace != null) {
executor.submit(
new Runnable() {
@Override
public void run() {
manager.metadata.triggerOnKeyspaceRemoved(removedKeyspace);
}
});
}
} else {
KeyspaceMetadata keyspace = manager.metadata.keyspaces.get(scc.targetKeyspace);
if (keyspace == null) {
logger.warn(
"Received a DROPPED notification for {} {}.{}, but this keyspace is unknown in our metadata",
scc.targetType,
scc.targetKeyspace,
scc.targetName);
} else {
switch (scc.targetType) {
case TABLE:
// we can't tell whether it's a table or a view,
// but since two objects cannot have the same name,
// try removing both
final TableMetadata removedTable = keyspace.removeTable(scc.targetName);
if (removedTable != null) {
executor.submit(
new Runnable() {
@Override
public void run() {
manager.metadata.triggerOnTableRemoved(removedTable);
}
});
} else {
final MaterializedViewMetadata removedView =
keyspace.removeMaterializedView(scc.targetName);
if (removedView != null) {
executor.submit(
new Runnable() {
@Override
public void run() {
manager.metadata.triggerOnMaterializedViewRemoved(removedView);
}
});
}
}
break;
case TYPE:
final UserType removedType = keyspace.removeUserType(scc.targetName);
if (removedType != null) {
executor.submit(
new Runnable() {
@Override
public void run() {
manager.metadata.triggerOnUserTypeRemoved(removedType);
}
});
}
break;
case FUNCTION:
final FunctionMetadata removedFunction =
keyspace.removeFunction(
Metadata.fullFunctionName(scc.targetName, scc.targetSignature));
if (removedFunction != null) {
executor.submit(
new Runnable() {
@Override
public void run() {
manager.metadata.triggerOnFunctionRemoved(removedFunction);
}
});
}
break;
case AGGREGATE:
final AggregateMetadata removedAggregate =
keyspace.removeAggregate(
Metadata.fullFunctionName(scc.targetName, scc.targetSignature));
if (removedAggregate != null) {
executor.submit(
new Runnable() {
@Override
public void run() {
manager.metadata.triggerOnAggregateRemoved(removedAggregate);
}
});
}
break;
}
}
}
break;
}
break;
}
}
void refreshConnectedHosts() {
// Deal first with the control connection: if it's connected to a node that is not LOCAL, try
// reconnecting (thus letting the loadBalancingPolicy pick a better node)
Host ccHost = controlConnection.connectedHost();
if (ccHost == null || loadBalancingPolicy().distance(ccHost) != HostDistance.LOCAL)
controlConnection.triggerReconnect();
try {
for (SessionManager s : sessions)
Uninterruptibles.getUninterruptibly(s.updateCreatedPools());
} catch (ExecutionException e) {
throw DriverThrowables.propagateCause(e);
}
}
void refreshConnectedHost(Host host) {
// Deal with the control connection if it was using this host
Host ccHost = controlConnection.connectedHost();
if (ccHost == null
|| ccHost.equals(host) && loadBalancingPolicy().distance(ccHost) != HostDistance.LOCAL)
controlConnection.triggerReconnect();
for (SessionManager s : sessions) s.updateCreatedPools(host);
}
private class ClusterCloseFuture extends CloseFuture.Forwarding {
ClusterCloseFuture(List futures) {
super(futures);
}
@Override
public CloseFuture force() {
// The only ExecutorService we haven't forced yet is executor
shutdownNow(executor);
return super.force();
}
@Override
protected void onFuturesDone() {
/*
* When we reach this, all sessions should be shutdown. We've also started a shutdown
* of the thread pools used by this object. Remains 2 things before marking the shutdown
* as done:
* 1) we need to wait for the completion of the shutdown of the Cluster threads pools.
* 2) we need to shutdown the Connection.Factory, i.e. the executors used by Netty.
* But at least for 2), we must not do it on the current thread because that could be
* a netty worker, which we're going to shutdown. So creates some thread for that.
*/
(new Thread("Shutdown-checker") {
@Override
public void run() {
// Just wait indefinitely on the the completion of the thread pools. Provided the
// user
// call force(), we'll never really block forever.
try {
if (reconnectionExecutor != null) {
reconnectionExecutor.awaitTermination(Long.MAX_VALUE, TimeUnit.SECONDS);
}
if (scheduledTasksExecutor != null) {
scheduledTasksExecutor.awaitTermination(Long.MAX_VALUE, TimeUnit.SECONDS);
}
if (executor != null) {
executor.awaitTermination(Long.MAX_VALUE, TimeUnit.SECONDS);
}
if (blockingExecutor != null) {
blockingExecutor.awaitTermination(Long.MAX_VALUE, TimeUnit.SECONDS);
}
// Some of the jobs on the executors can be doing query stuff, so close the
// connectionFactory at the very last
if (connectionFactory != null) {
connectionFactory.shutdown();
}
if (reaper != null) {
reaper.shutdown();
}
set(null);
} catch (InterruptedException e) {
Thread.currentThread().interrupt();
setException(e);
}
}
})
.start();
}
}
private class CleanupIdleConnectionsTask implements Runnable {
@Override
public void run() {
try {
long now = System.currentTimeMillis();
for (SessionManager session : sessions) {
session.cleanupIdleConnections(now);
}
} catch (Exception e) {
logger.warn("Error while trashing idle connections", e);
}
}
}
private class SchemaRefreshRequest {
private final SchemaElement targetType;
private final String targetKeyspace;
private final String targetName;
private final List targetSignature;
public SchemaRefreshRequest(
SchemaElement targetType,
String targetKeyspace,
String targetName,
List targetSignature) {
this.targetType = targetType;
this.targetKeyspace = Strings.emptyToNull(targetKeyspace);
this.targetName = Strings.emptyToNull(targetName);
this.targetSignature = targetSignature;
}
/**
* Coalesce schema refresh requests. The algorithm is simple: if more than 2 keyspaces need
* refresh, then refresh the entire schema; otherwise if more than 2 elements in the same
* keyspace need refresh, then refresh the entire keyspace.
*
* @param that the other request to merge with the current one.
* @return A coalesced request
*/
SchemaRefreshRequest coalesce(SchemaRefreshRequest that) {
if (this.targetType == null || that.targetType == null)
return new SchemaRefreshRequest(null, null, null, null);
if (!this.targetKeyspace.equals(that.targetKeyspace))
return new SchemaRefreshRequest(null, null, null, null);
if (this.targetName == null || that.targetName == null)
return new SchemaRefreshRequest(KEYSPACE, targetKeyspace, null, null);
if (!this.targetName.equals(that.targetName))
return new SchemaRefreshRequest(KEYSPACE, targetKeyspace, null, null);
return this;
}
@Override
public String toString() {
if (this.targetType == null) return "Refresh ALL";
if (this.targetName == null) return "Refresh keyspace " + targetKeyspace;
return String.format("Refresh %s %s.%s", targetType, targetKeyspace, targetName);
}
}
private class SchemaRefreshRequestDeliveryCallback
implements EventDebouncer.DeliveryCallback {
@Override
public ListenableFuture deliver(final List events) {
return executor.submit(
new ExceptionCatchingRunnable() {
@Override
public void runMayThrow() throws InterruptedException, ExecutionException {
if (schemaRefreshRequestDebouncer.maxPendingEvents() > 1) {
SchemaRefreshRequest coalesced = null;
for (SchemaRefreshRequest request : events) {
coalesced = coalesced == null ? request : coalesced.coalesce(request);
}
assert coalesced != null;
logger.trace("Coalesced schema refresh request: {}", coalesced);
controlConnection.refreshSchema(
coalesced.targetType,
coalesced.targetKeyspace,
coalesced.targetName,
coalesced.targetSignature);
} else {
for (SchemaRefreshRequest request : events) {
logger.trace("Schema refresh request: {}", request);
controlConnection.refreshSchema(
request.targetType,
request.targetKeyspace,
request.targetName,
request.targetSignature);
}
}
}
});
}
}
private class NodeRefreshRequest {
private final InetSocketAddress address;
private final HostEvent eventType;
private NodeRefreshRequest(InetSocketAddress address, HostEvent eventType) {
this.address = address;
this.eventType = eventType;
}
@Override
public String toString() {
return address + " " + eventType;
}
}
private class NodeRefreshRequestDeliveryCallback
implements EventDebouncer.DeliveryCallback {
@Override
public ListenableFuture deliver(List events) {
Map hosts = new HashMap();
// only keep the last event for each host
for (NodeRefreshRequest req : events) {
hosts.put(req.address, req.eventType);
}
List> futures = new ArrayList>(hosts.size());
for (final Entry entry : hosts.entrySet()) {
InetSocketAddress address = entry.getKey();
HostEvent eventType = entry.getValue();
switch (eventType) {
case UP:
Host upHost = metadata.getHost(address);
if (upHost == null) {
// We don't have enough information to create a new Host (we are missing it's ID)
// so trigger a full node refresh
submitNodeListRefresh();
} else {
futures.add(schedule(hostUp(upHost)));
}
break;
case DOWN:
// Note that there is a slight risk we can receive the event late and thus
// mark the host down even though we already had reconnected successfully.
// But it is unlikely, and don't have too much consequence since we'll try
// reconnecting
// right away, so we favor the detection to make the Host.isUp method more reliable.
Host downHost = metadata.getHost(address);
if (downHost != null) {
// Only process DOWN events if we have no active connections to the host .
// Otherwise, we
// wait for the connections to fail. This is to prevent against a bad control host
// aggressively marking DOWN all of its peers.
if (downHost.convictionPolicy.hasActiveConnections()) {
logger.debug(
"Ignoring down event on {} because it still has active connections",
downHost);
} else {
futures.add(execute(hostDown(downHost)));
}
}
break;
case REMOVED:
Host removedHost = metadata.getHost(address);
if (removedHost != null) futures.add(execute(hostRemoved(removedHost)));
break;
}
}
return Futures.allAsList(futures);
}
private ListenableFuture execute(ExceptionCatchingRunnable task) {
return executor.submit(task);
}
private ListenableFuture schedule(final ExceptionCatchingRunnable task) {
// Cassandra tends to send notifications for new/up nodes a bit early (it is triggered once
// gossip is up, but that is before the client-side server is up), so we add a delay
// (otherwise the connection will likely fail and have to be retry which is wasteful).
// This has been fixed by CASSANDRA-8236 and does not apply to protocol versions >= 4
// and C* versions >= 2.2.0
if (protocolVersion().compareTo(ProtocolVersion.V4) < 0) {
final SettableFuture future = SettableFuture.create();
scheduledTasksExecutor.schedule(
new ExceptionCatchingRunnable() {
@Override
public void runMayThrow() throws Exception {
ListenableFuture f = execute(task);
GuavaCompatibility.INSTANCE.addCallback(
f,
new FutureCallback