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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.schema;
import java.io.IOException;
import java.util.*;
import java.util.concurrent.*;
import java.lang.management.ManagementFactory;
import java.util.function.LongSupplier;
import com.google.common.annotations.VisibleForTesting;
import com.google.common.util.concurrent.Futures;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.apache.cassandra.db.*;
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.DataInputPlus;
import org.apache.cassandra.io.util.DataOutputPlus;
import org.apache.cassandra.locator.InetAddressAndPort;
import org.apache.cassandra.net.Message;
import org.apache.cassandra.net.MessagingService;
import org.apache.cassandra.schema.Keyspaces.KeyspacesDiff;
import org.apache.cassandra.utils.FBUtilities;
import static org.apache.cassandra.concurrent.Stage.MIGRATION;
import static org.apache.cassandra.net.Verb.SCHEMA_PUSH_REQ;
public class MigrationManager
{
private static final Logger logger = LoggerFactory.getLogger(MigrationManager.class);
public static final MigrationManager instance = new MigrationManager();
private MigrationManager() {}
private static boolean shouldPushSchemaTo(InetAddressAndPort endpoint)
{
// only push schema to nodes with known and equal versions
return !endpoint.equals(FBUtilities.getBroadcastAddressAndPort())
&& MessagingService.instance().versions.knows(endpoint)
&& MessagingService.instance().versions.getRaw(endpoint) == MessagingService.current_version;
}
public static void announceNewKeyspace(KeyspaceMetadata ksm) throws ConfigurationException
{
announceNewKeyspace(ksm, false);
}
public static void announceNewKeyspace(KeyspaceMetadata ksm, boolean announceLocally) throws ConfigurationException
{
announceNewKeyspace(ksm, FBUtilities.timestampMicros(), announceLocally);
}
public static void announceNewKeyspace(KeyspaceMetadata ksm, long timestamp, boolean announceLocally) throws ConfigurationException
{
ksm.validate();
if (Schema.instance.getKeyspaceMetadata(ksm.name) != null)
throw new AlreadyExistsException(ksm.name);
logger.info("Create new Keyspace: {}", ksm);
announce(SchemaKeyspace.makeCreateKeyspaceMutation(ksm, timestamp), announceLocally);
}
public static void announceNewTable(TableMetadata cfm)
{
announceNewTable(cfm, true, FBUtilities.timestampMicros());
}
private static void announceNewTable(TableMetadata cfm, boolean throwOnDuplicate, long timestamp)
{
cfm.validate();
KeyspaceMetadata ksm = Schema.instance.getKeyspaceMetadata(cfm.keyspace);
if (ksm == null)
throw new ConfigurationException(String.format("Cannot add table '%s' to non existing keyspace '%s'.", cfm.name, cfm.keyspace));
// If we have a table or a view which has the same name, we can't add a new one
else if (throwOnDuplicate && ksm.getTableOrViewNullable(cfm.name) != null)
throw new AlreadyExistsException(cfm.keyspace, cfm.name);
logger.info("Create new table: {}", cfm);
announce(SchemaKeyspace.makeCreateTableMutation(ksm, cfm, timestamp), false);
}
static void announceKeyspaceUpdate(KeyspaceMetadata ksm)
{
ksm.validate();
KeyspaceMetadata oldKsm = Schema.instance.getKeyspaceMetadata(ksm.name);
if (oldKsm == null)
throw new ConfigurationException(String.format("Cannot update non existing keyspace '%s'.", ksm.name));
logger.info("Update Keyspace '{}' From {} To {}", ksm.name, oldKsm, ksm);
announce(SchemaKeyspace.makeCreateKeyspaceMutation(ksm.name, ksm.params, FBUtilities.timestampMicros()), false);
}
public static void announceTableUpdate(TableMetadata tm)
{
announceTableUpdate(tm, false);
}
public static void announceTableUpdate(TableMetadata updated, boolean announceLocally)
{
updated.validate();
TableMetadata current = Schema.instance.getTableMetadata(updated.keyspace, updated.name);
if (current == null)
throw new ConfigurationException(String.format("Cannot update non existing table '%s' in keyspace '%s'.", updated.name, updated.keyspace));
KeyspaceMetadata ksm = Schema.instance.getKeyspaceMetadata(current.keyspace);
updated.validateCompatibility(current);
long timestamp = FBUtilities.timestampMicros();
logger.info("Update table '{}/{}' From {} To {}", current.keyspace, current.name, current, updated);
Mutation.SimpleBuilder builder = SchemaKeyspace.makeUpdateTableMutation(ksm, current, updated, timestamp);
announce(builder, announceLocally);
}
static void announceKeyspaceDrop(String ksName)
{
KeyspaceMetadata oldKsm = Schema.instance.getKeyspaceMetadata(ksName);
if (oldKsm == null)
throw new ConfigurationException(String.format("Cannot drop non existing keyspace '%s'.", ksName));
logger.info("Drop Keyspace '{}'", oldKsm.name);
announce(SchemaKeyspace.makeDropKeyspaceMutation(oldKsm, FBUtilities.timestampMicros()), false);
}
public static void announceTableDrop(String ksName, String cfName, boolean announceLocally)
{
TableMetadata tm = Schema.instance.getTableMetadata(ksName, cfName);
if (tm == null)
throw new ConfigurationException(String.format("Cannot drop non existing table '%s' in keyspace '%s'.", cfName, ksName));
KeyspaceMetadata ksm = Schema.instance.getKeyspaceMetadata(ksName);
logger.info("Drop table '{}/{}'", tm.keyspace, tm.name);
announce(SchemaKeyspace.makeDropTableMutation(ksm, tm, FBUtilities.timestampMicros()), announceLocally);
}
/**
* actively announce a new version to active hosts via rpc
* @param schema The schema mutation to be applied
*/
private static void announce(Mutation.SimpleBuilder schema, boolean announceLocally)
{
List mutations = Collections.singletonList(schema.build());
if (announceLocally)
Schema.instance.merge(mutations);
else
announce(mutations);
}
public static void announce(Mutation change)
{
announce(Collections.singleton(change));
}
public static void announce(Collection schema)
{
Future f = announceWithoutPush(schema);
Set schemaDestinationEndpoints = new HashSet<>();
Set schemaEndpointsIgnored = new HashSet<>();
Message> message = Message.out(SCHEMA_PUSH_REQ, schema);
for (InetAddressAndPort endpoint : Gossiper.instance.getLiveMembers())
{
if (shouldPushSchemaTo(endpoint))
{
MessagingService.instance().send(message, endpoint);
schemaDestinationEndpoints.add(endpoint);
}
else
{
schemaEndpointsIgnored.add(endpoint);
}
}
SchemaAnnouncementDiagnostics.schemaMutationsAnnounced(schemaDestinationEndpoints, schemaEndpointsIgnored);
FBUtilities.waitOnFuture(f);
}
public static Future announceWithoutPush(Collection schema)
{
return MIGRATION.submit(() -> Schema.instance.mergeAndAnnounceVersion(schema));
}
public static KeyspacesDiff announce(SchemaTransformation transformation, boolean locally)
{
long now = FBUtilities.timestampMicros();
Future future =
MIGRATION.submit(() -> Schema.instance.transform(transformation, locally, now));
Schema.TransformationResult result = Futures.getUnchecked(future);
if (!result.success)
throw result.exception;
if (locally || result.diff.isEmpty())
return result.diff;
Set schemaDestinationEndpoints = new HashSet<>();
Set schemaEndpointsIgnored = new HashSet<>();
Message> message = Message.out(SCHEMA_PUSH_REQ, result.mutations);
for (InetAddressAndPort endpoint : Gossiper.instance.getLiveMembers())
{
if (shouldPushSchemaTo(endpoint))
{
MessagingService.instance().send(message, endpoint);
schemaDestinationEndpoints.add(endpoint);
}
else
{
schemaEndpointsIgnored.add(endpoint);
}
}
SchemaAnnouncementDiagnostics.schemaTransformationAnnounced(schemaDestinationEndpoints, schemaEndpointsIgnored,
transformation);
return result.diff;
}
/**
* 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.
*/
public static void resetLocalSchema()
{
logger.info("Starting local schema reset...");
logger.debug("Truncating schema tables...");
SchemaMigrationDiagnostics.resetLocalSchema();
Schema.instance.truncateSchemaKeyspace();
logger.debug("Clearing local schema keyspace definitions...");
Schema.instance.clear();
// clean the all version information from the MigrationCoordinator
MigrationCoordinator.instance.reset();
// now report again the versions we are aware of
Set liveEndpoints = Gossiper.instance.getLiveMembers();
liveEndpoints.remove(FBUtilities.getBroadcastAddressAndPort());
// force migration if there are nodes around
for (InetAddressAndPort node : liveEndpoints)
{
EndpointState state = Gossiper.instance.getEndpointStateForEndpoint(node);
Future pull = MigrationCoordinator.instance.reportEndpointVersion(node, state);
if (pull != null)
FBUtilities.waitOnFuture(pull);
}
logger.info("Local schema reset is complete.");
}
/**
* We have a set of non-local, distributed system keyspaces, e.g. system_traces, system_auth, etc.
* (see {@link SchemaConstants#REPLICATED_SYSTEM_KEYSPACE_NAMES}), that need to be created on cluster initialisation,
* and later evolved on major upgrades (sometimes minor too). This method compares the current known definitions
* of the tables (if the keyspace exists) to the expected, most modern ones expected by the running version of C*;
* if any changes have been detected, a schema Mutation will be created which, when applied, should make
* cluster's view of that keyspace aligned with the expected modern definition.
*
* @param keyspace the expected modern definition of the keyspace
* @param generation timestamp to use for the table changes in the schema mutation
*
* @return empty Optional if the current definition is up to date, or an Optional with the Mutation that would
* bring the schema in line with the expected definition.
*/
public static Optional evolveSystemKeyspace(KeyspaceMetadata keyspace, long generation)
{
Mutation.SimpleBuilder builder = null;
KeyspaceMetadata definedKeyspace = Schema.instance.getKeyspaceMetadata(keyspace.name);
Tables definedTables = null == definedKeyspace ? Tables.none() : definedKeyspace.tables;
for (TableMetadata table : keyspace.tables)
{
if (table.equals(definedTables.getNullable(table.name)))
continue;
if (null == builder)
{
// for the keyspace definition itself (name, replication, durability) always use generation 0;
// this ensures that any changes made to replication by the user will never be overwritten.
builder = SchemaKeyspace.makeCreateKeyspaceMutation(keyspace.name, keyspace.params, 0);
// now set the timestamp to generation, so the tables have the expected timestamp
builder.timestamp(generation);
}
// for table definitions always use the provided generation; these tables, unlike their containing
// keyspaces, are *NOT* meant to be altered by the user; if their definitions need to change,
// the schema must be updated in code, and the appropriate generation must be bumped.
SchemaKeyspace.addTableToSchemaMutation(table, true, builder);
}
return builder == null ? Optional.empty() : Optional.of(builder.build());
}
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(DataInputPlus 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.sizeof(schema.size());
for (Mutation mutation : schema)
size += mutation.serializedSize(version);
return size;
}
}
}
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