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The Apache Cassandra Project develops a highly scalable second-generation distributed database, bringing together Dynamo's fully distributed design and Bigtable's ColumnFamily-based data model.
/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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.
*/
package org.apache.cassandra.service;
import java.io.DataInput;
import java.io.IOException;
import java.net.InetAddress;
import java.util.*;
import java.util.concurrent.CopyOnWriteArrayList;
import java.util.concurrent.Future;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.*;
import java.lang.management.ManagementFactory;
import java.lang.management.RuntimeMXBean;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.apache.cassandra.concurrent.ScheduledExecutors;
import org.apache.cassandra.concurrent.Stage;
import org.apache.cassandra.concurrent.StageManager;
import org.apache.cassandra.config.CFMetaData;
import org.apache.cassandra.config.KSMetaData;
import org.apache.cassandra.config.UTMetaData;
import org.apache.cassandra.config.Schema;
import org.apache.cassandra.db.*;
import org.apache.cassandra.db.marshal.UserType;
import org.apache.cassandra.exceptions.AlreadyExistsException;
import org.apache.cassandra.exceptions.ConfigurationException;
import org.apache.cassandra.gms.*;
import org.apache.cassandra.io.IVersionedSerializer;
import org.apache.cassandra.io.util.DataOutputPlus;
import org.apache.cassandra.net.MessageOut;
import org.apache.cassandra.net.MessagingService;
import org.apache.cassandra.utils.FBUtilities;
import org.apache.cassandra.utils.WrappedRunnable;
public class MigrationManager
{
private static final Logger logger = LoggerFactory.getLogger(MigrationManager.class);
public static final MigrationManager instance = new MigrationManager();
private static final RuntimeMXBean runtimeMXBean = ManagementFactory.getRuntimeMXBean();
public static final int MIGRATION_DELAY_IN_MS = 60000;
private final List listeners = new CopyOnWriteArrayList();
private MigrationManager() {}
public void register(MigrationListener listener)
{
listeners.add(listener);
}
public void unregister(MigrationListener listener)
{
listeners.remove(listener);
}
public void scheduleSchemaPull(InetAddress endpoint, EndpointState state)
{
VersionedValue value = state.getApplicationState(ApplicationState.SCHEMA);
if (!endpoint.equals(FBUtilities.getBroadcastAddress()) && value != null)
maybeScheduleSchemaPull(UUID.fromString(value.value), endpoint);
}
/**
* If versions differ this node sends request with local migration list to the endpoint
* and expecting to receive a list of migrations to apply locally.
*/
private static void maybeScheduleSchemaPull(final UUID theirVersion, final InetAddress endpoint)
{
if ((Schema.instance.getVersion() != null && Schema.instance.getVersion().equals(theirVersion)) || !shouldPullSchemaFrom(endpoint))
{
logger.debug("Not pulling schema because versions match or shouldPullSchemaFrom returned false");
return;
}
if (Schema.emptyVersion.equals(Schema.instance.getVersion()) || runtimeMXBean.getUptime() < MIGRATION_DELAY_IN_MS)
{
// If we think we may be bootstrapping or have recently started, submit MigrationTask immediately
logger.debug("Submitting migration task for {}", endpoint);
submitMigrationTask(endpoint);
}
else
{
// Include a delay to make sure we have a chance to apply any changes being
// pushed out simultaneously. See CASSANDRA-5025
Runnable runnable = new Runnable()
{
public void run()
{
// grab the latest version of the schema since it may have changed again since the initial scheduling
EndpointState epState = Gossiper.instance.getEndpointStateForEndpoint(endpoint);
if (epState == null)
{
logger.debug("epState vanished for {}, not submitting migration task", endpoint);
return;
}
VersionedValue value = epState.getApplicationState(ApplicationState.SCHEMA);
UUID currentVersion = UUID.fromString(value.value);
if (Schema.instance.getVersion().equals(currentVersion))
{
logger.debug("not submitting migration task for {} because our versions match", endpoint);
return;
}
logger.debug("submitting migration task for {}", endpoint);
submitMigrationTask(endpoint);
}
};
ScheduledExecutors.optionalTasks.schedule(runnable, MIGRATION_DELAY_IN_MS, TimeUnit.MILLISECONDS);
}
}
private static Future submitMigrationTask(InetAddress endpoint)
{
/*
* Do not de-ref the future because that causes distributed deadlock (CASSANDRA-3832) because we are
* running in the gossip stage.
*/
return StageManager.getStage(Stage.MIGRATION).submit(new MigrationTask(endpoint));
}
public static boolean shouldPullSchemaFrom(InetAddress endpoint)
{
/*
* Don't request schema from nodes with a differnt or unknonw major version (may have incompatible schema)
* Don't request schema from fat clients
*/
return MessagingService.instance().knowsVersion(endpoint)
&& MessagingService.instance().getRawVersion(endpoint) == MessagingService.current_version
&& !Gossiper.instance.isFatClient(endpoint);
}
public static boolean isReadyForBootstrap()
{
return ((ThreadPoolExecutor) StageManager.getStage(Stage.MIGRATION)).getActiveCount() == 0;
}
public void notifyCreateKeyspace(KSMetaData ksm)
{
for (MigrationListener listener : listeners)
listener.onCreateKeyspace(ksm.name);
}
public void notifyCreateColumnFamily(CFMetaData cfm)
{
for (MigrationListener listener : listeners)
listener.onCreateColumnFamily(cfm.ksName, cfm.cfName);
}
public void notifyCreateUserType(UserType ut)
{
for (MigrationListener listener : listeners)
listener.onCreateUserType(ut.keyspace, ut.getNameAsString());
}
public void notifyUpdateKeyspace(KSMetaData ksm)
{
for (MigrationListener listener : listeners)
listener.onUpdateKeyspace(ksm.name);
}
public void notifyUpdateColumnFamily(CFMetaData cfm, boolean columnsDidChange)
{
for (MigrationListener listener : listeners)
listener.onUpdateColumnFamily(cfm.ksName, cfm.cfName, columnsDidChange);
}
public void notifyUpdateUserType(UserType ut)
{
for (MigrationListener listener : listeners)
listener.onUpdateUserType(ut.keyspace, ut.getNameAsString());
}
public void notifyDropKeyspace(KSMetaData ksm)
{
for (MigrationListener listener : listeners)
listener.onDropKeyspace(ksm.name);
}
public void notifyDropColumnFamily(CFMetaData cfm)
{
for (MigrationListener listener : listeners)
listener.onDropColumnFamily(cfm.ksName, cfm.cfName);
}
public void notifyDropUserType(UserType ut)
{
for (MigrationListener listener : listeners)
listener.onDropUserType(ut.keyspace, ut.getNameAsString());
}
public static void announceNewKeyspace(KSMetaData ksm) throws ConfigurationException
{
announceNewKeyspace(ksm, false);
}
public static void announceNewKeyspace(KSMetaData ksm, boolean announceLocally) throws ConfigurationException
{
announceNewKeyspace(ksm, FBUtilities.timestampMicros(), announceLocally);
}
public static void announceNewKeyspace(KSMetaData ksm, long timestamp, boolean announceLocally) throws ConfigurationException
{
ksm.validate();
if (Schema.instance.getKSMetaData(ksm.name) != null)
throw new AlreadyExistsException(ksm.name);
logger.info(String.format("Create new Keyspace: %s", ksm));
announce(ksm.toSchema(timestamp), announceLocally);
}
public static void announceNewColumnFamily(CFMetaData cfm) throws ConfigurationException
{
announceNewColumnFamily(cfm, false);
}
public static void announceNewColumnFamily(CFMetaData cfm, boolean announceLocally) throws ConfigurationException
{
cfm.validate();
KSMetaData ksm = Schema.instance.getKSMetaData(cfm.ksName);
if (ksm == null)
throw new ConfigurationException(String.format("Cannot add column family '%s' to non existing keyspace '%s'.", cfm.cfName, cfm.ksName));
else if (ksm.cfMetaData().containsKey(cfm.cfName))
throw new AlreadyExistsException(cfm.ksName, cfm.cfName);
logger.info(String.format("Create new ColumnFamily: %s", cfm));
announce(addSerializedKeyspace(cfm.toSchema(FBUtilities.timestampMicros()), cfm.ksName), announceLocally);
}
public static void announceNewType(UserType newType)
{
announceNewType(newType, false);
}
public static void announceNewType(UserType newType, boolean announceLocally)
{
announce(addSerializedKeyspace(UTMetaData.toSchema(newType, FBUtilities.timestampMicros()), newType.keyspace), announceLocally);
}
public static void announceKeyspaceUpdate(KSMetaData ksm) throws ConfigurationException
{
announceKeyspaceUpdate(ksm, false);
}
public static void announceKeyspaceUpdate(KSMetaData ksm, boolean announceLocally) throws ConfigurationException
{
ksm.validate();
KSMetaData oldKsm = Schema.instance.getKSMetaData(ksm.name);
if (oldKsm == null)
throw new ConfigurationException(String.format("Cannot update non existing keyspace '%s'.", ksm.name));
logger.info(String.format("Update Keyspace '%s' From %s To %s", ksm.name, oldKsm, ksm));
announce(oldKsm.toSchemaUpdate(ksm, FBUtilities.timestampMicros()), announceLocally);
}
public static void announceColumnFamilyUpdate(CFMetaData cfm, boolean fromThrift) throws ConfigurationException
{
announceColumnFamilyUpdate(cfm, fromThrift, false);
}
public static void announceColumnFamilyUpdate(CFMetaData cfm, boolean fromThrift, boolean announceLocally) throws ConfigurationException
{
cfm.validate();
CFMetaData oldCfm = Schema.instance.getCFMetaData(cfm.ksName, cfm.cfName);
if (oldCfm == null)
throw new ConfigurationException(String.format("Cannot update non existing column family '%s' in keyspace '%s'.", cfm.cfName, cfm.ksName));
oldCfm.validateCompatility(cfm);
logger.info(String.format("Update ColumnFamily '%s/%s' From %s To %s", cfm.ksName, cfm.cfName, oldCfm, cfm));
announce(addSerializedKeyspace(oldCfm.toSchemaUpdate(cfm, FBUtilities.timestampMicros(), fromThrift), cfm.ksName), announceLocally);
}
public static void announceTypeUpdate(UserType updatedType)
{
announceTypeUpdate(updatedType, false);
}
public static void announceTypeUpdate(UserType updatedType, boolean announceLocally)
{
announceNewType(updatedType, announceLocally);
}
public static void announceKeyspaceDrop(String ksName) throws ConfigurationException
{
announceKeyspaceDrop(ksName, false);
}
public static void announceKeyspaceDrop(String ksName, boolean announceLocally) throws ConfigurationException
{
KSMetaData oldKsm = Schema.instance.getKSMetaData(ksName);
if (oldKsm == null)
throw new ConfigurationException(String.format("Cannot drop non existing keyspace '%s'.", ksName));
logger.info(String.format("Drop Keyspace '%s'", oldKsm.name));
announce(oldKsm.dropFromSchema(FBUtilities.timestampMicros()), announceLocally);
}
public static void announceColumnFamilyDrop(String ksName, String cfName) throws ConfigurationException
{
announceColumnFamilyDrop(ksName, cfName, false);
}
public static void announceColumnFamilyDrop(String ksName, String cfName, boolean announceLocally) throws ConfigurationException
{
CFMetaData oldCfm = Schema.instance.getCFMetaData(ksName, cfName);
if (oldCfm == null)
throw new ConfigurationException(String.format("Cannot drop non existing column family '%s' in keyspace '%s'.", cfName, ksName));
logger.info(String.format("Drop ColumnFamily '%s/%s'", oldCfm.ksName, oldCfm.cfName));
announce(addSerializedKeyspace(oldCfm.dropFromSchema(FBUtilities.timestampMicros()), ksName), announceLocally);
}
// Include the serialized keyspace for when a target node missed the CREATE KEYSPACE migration (see #5631).
private static Mutation addSerializedKeyspace(Mutation migration, String ksName)
{
migration.add(SystemKeyspace.readSchemaRow(SystemKeyspace.SCHEMA_KEYSPACES_CF, ksName).cf);
return migration;
}
public static void announceTypeDrop(UserType droppedType)
{
announceTypeDrop(droppedType, false);
}
public static void announceTypeDrop(UserType droppedType, boolean announceLocally)
{
announce(addSerializedKeyspace(UTMetaData.dropFromSchema(droppedType, FBUtilities.timestampMicros()), droppedType.keyspace), announceLocally);
}
/**
* actively announce a new version to active hosts via rpc
* @param schema The schema mutation to be applied
*/
private static void announce(Mutation schema, boolean announceLocally)
{
if (announceLocally)
{
try
{
DefsTables.mergeSchemaInternal(Collections.singletonList(schema), false);
}
catch (ConfigurationException | IOException e)
{
throw new RuntimeException(e);
}
}
else
{
FBUtilities.waitOnFuture(announce(Collections.singletonList(schema)));
}
}
private static void pushSchemaMutation(InetAddress endpoint, Collection schema)
{
MessageOut> msg = new MessageOut<>(MessagingService.Verb.DEFINITIONS_UPDATE,
schema,
MigrationsSerializer.instance);
MessagingService.instance().sendOneWay(msg, endpoint);
}
// Returns a future on the local application of the schema
private static Future announce(final Collection schema)
{
Future f = StageManager.getStage(Stage.MIGRATION).submit(new WrappedRunnable()
{
protected void runMayThrow() throws IOException, ConfigurationException
{
DefsTables.mergeSchema(schema);
}
});
for (InetAddress endpoint : Gossiper.instance.getLiveMembers())
{
// only push schema to nodes with known and equal versions
if (!endpoint.equals(FBUtilities.getBroadcastAddress()) &&
MessagingService.instance().knowsVersion(endpoint) &&
MessagingService.instance().getRawVersion(endpoint) == MessagingService.current_version)
pushSchemaMutation(endpoint, schema);
}
return f;
}
/**
* Announce my version passively over gossip.
* Used to notify nodes as they arrive in the cluster.
*
* @param version The schema version to announce
*/
public static void passiveAnnounce(UUID version)
{
Gossiper.instance.addLocalApplicationState(ApplicationState.SCHEMA, StorageService.instance.valueFactory.schema(version));
logger.debug("Gossiping my schema version {}", version);
}
/**
* Clear all locally stored schema information and reset schema to initial state.
* Called by user (via JMX) who wants to get rid of schema disagreement.
*
* @throws IOException if schema tables truncation fails
*/
public static void resetLocalSchema() throws IOException
{
logger.info("Starting local schema reset...");
logger.debug("Truncating schema tables...");
// truncate schema tables
for (String cf : SystemKeyspace.allSchemaCfs)
SystemKeyspace.schemaCFS(cf).truncateBlocking();
logger.debug("Clearing local schema keyspace definitions...");
Schema.instance.clear();
Set liveEndpoints = Gossiper.instance.getLiveMembers();
liveEndpoints.remove(FBUtilities.getBroadcastAddress());
// force migration if there are nodes around
for (InetAddress node : liveEndpoints)
{
if (shouldPullSchemaFrom(node))
{
logger.debug("Requesting schema from {}", node);
FBUtilities.waitOnFuture(submitMigrationTask(node));
break;
}
}
logger.info("Local schema reset is complete.");
}
public static class MigrationsSerializer implements IVersionedSerializer>
{
public static MigrationsSerializer instance = new MigrationsSerializer();
public void serialize(Collection schema, DataOutputPlus out, int version) throws IOException
{
out.writeInt(schema.size());
for (Mutation mutation : schema)
Mutation.serializer.serialize(mutation, out, version);
}
public Collection deserialize(DataInput in, int version) throws IOException
{
int count = in.readInt();
Collection schema = new ArrayList(count);
for (int i = 0; i < count; i++)
schema.add(Mutation.serializer.deserialize(in, version));
return schema;
}
public long serializedSize(Collection schema, int version)
{
int size = TypeSizes.NATIVE.sizeof(schema.size());
for (Mutation mutation : schema)
size += Mutation.serializer.serializedSize(mutation, version);
return size;
}
}
}
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