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/*
* 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.IOException;
import java.net.InetAddress;
import java.util.*;
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.Schema;
import org.apache.cassandra.config.ViewDefinition;
import org.apache.cassandra.cql3.functions.UDAggregate;
import org.apache.cassandra.cql3.functions.UDFunction;
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.DataInputPlus;
import org.apache.cassandra.io.util.DataOutputPlus;
import org.apache.cassandra.net.MessageOut;
import org.apache.cassandra.net.MessagingService;
import org.apache.cassandra.schema.KeyspaceMetadata;
import org.apache.cassandra.schema.SchemaKeyspace;
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 static final int MIGRATION_TASK_WAIT_IN_SECONDS = Integer.parseInt(System.getProperty("cassandra.migration_task_wait_in_seconds", "1"));
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 static void scheduleSchemaPull(InetAddress endpoint, EndpointState state)
{
UUID schemaVersion = state.getSchemaVersion();
if (!endpoint.equals(FBUtilities.getBroadcastAddress()) && schemaVersion != null)
maybeScheduleSchemaPull(schemaVersion, 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)
{
logger.debug("Not pulling schema from {}, because local schama version is not known yet",
endpoint);
return;
}
if (Schema.instance.isSameVersion(theirVersion))
{
logger.debug("Not pulling schema from {}, because schema versions match: " +
"local/real={}, local/compatible={}, remote={}",
endpoint,
Schema.schemaVersionToString(Schema.instance.getRealVersion()),
Schema.schemaVersionToString(Schema.instance.getAltVersion()),
Schema.schemaVersionToString(theirVersion));
return;
}
if (!shouldPullSchemaFrom(endpoint))
{
logger.debug("Not pulling schema because versions match or shouldPullSchemaFrom returned false");
return;
}
if (Schema.instance.isEmpty() || runtimeMXBean.getUptime() < MIGRATION_DELAY_IN_MS)
{
// If we think we may be bootstrapping or have recently started, submit MigrationTask immediately
logger.debug("Immediately submitting migration task for {}, " +
"schema versions: local/real={}, local/compatible={}, remote={}",
endpoint,
Schema.schemaVersionToString(Schema.instance.getRealVersion()),
Schema.schemaVersionToString(Schema.instance.getAltVersion()),
Schema.schemaVersionToString(theirVersion));
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 = () ->
{
// grab the latest version of the schema since it may have changed again since the initial scheduling
UUID epSchemaVersion = Gossiper.instance.getSchemaVersion(endpoint);
if (epSchemaVersion == null)
{
logger.debug("epState vanished for {}, not submitting migration task", endpoint);
return;
}
if (Schema.instance.isSameVersion(epSchemaVersion))
{
logger.debug("Not submitting migration task for {} because our versions match ({})", endpoint, epSchemaVersion);
return;
}
logger.debug("submitting migration task for {}, schema version mismatch: local/real={}, local/compatible={}, remote={}",
endpoint,
Schema.schemaVersionToString(Schema.instance.getRealVersion()),
Schema.schemaVersionToString(Schema.instance.getAltVersion()),
Schema.schemaVersionToString(epSchemaVersion));
submitMigrationTask(endpoint);
};
ScheduledExecutors.nonPeriodicTasks.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)
&& is30Compatible(MessagingService.instance().getRawVersion(endpoint))
&& !Gossiper.instance.isGossipOnlyMember(endpoint);
}
// Since 3.0.14 protocol contains only a CASSANDRA-13004 bugfix, it is safe to accept schema changes
// from both 3.0 and 3.0.14.
private static boolean is30Compatible(int version)
{
return version == MessagingService.current_version || version == MessagingService.VERSION_3014;
}
public static boolean isReadyForBootstrap()
{
return MigrationTask.getInflightTasks().isEmpty();
}
public static void waitUntilReadyForBootstrap()
{
CountDownLatch completionLatch;
while ((completionLatch = MigrationTask.getInflightTasks().poll()) != null)
{
try
{
if (!completionLatch.await(MIGRATION_TASK_WAIT_IN_SECONDS, TimeUnit.SECONDS))
logger.error("Migration task failed to complete");
}
catch (InterruptedException e)
{
Thread.currentThread().interrupt();
logger.error("Migration task was interrupted");
}
}
}
public void notifyCreateKeyspace(KeyspaceMetadata 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 notifyCreateView(ViewDefinition view)
{
for (MigrationListener listener : listeners)
listener.onCreateView(view.ksName, view.viewName);
}
public void notifyCreateUserType(UserType ut)
{
for (MigrationListener listener : listeners)
listener.onCreateUserType(ut.keyspace, ut.getNameAsString());
}
public void notifyCreateFunction(UDFunction udf)
{
for (MigrationListener listener : listeners)
listener.onCreateFunction(udf.name().keyspace, udf.name().name, udf.argTypes());
}
public void notifyCreateAggregate(UDAggregate udf)
{
for (MigrationListener listener : listeners)
listener.onCreateAggregate(udf.name().keyspace, udf.name().name, udf.argTypes());
}
public void notifyUpdateKeyspace(KeyspaceMetadata 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 notifyUpdateView(ViewDefinition view, boolean columnsDidChange)
{
for (MigrationListener listener : listeners)
listener.onUpdateView(view.ksName, view.viewName, columnsDidChange);
}
public void notifyUpdateUserType(UserType ut)
{
for (MigrationListener listener : listeners)
listener.onUpdateUserType(ut.keyspace, ut.getNameAsString());
// FIXME: remove when we get rid of AbstractType in metadata. Doesn't really belong anywhere.
Schema.instance.getKSMetaData(ut.keyspace).functions.udfs().forEach(f -> f.userTypeUpdated(ut.keyspace, ut.getNameAsString()));
}
public void notifyUpdateFunction(UDFunction udf)
{
for (MigrationListener listener : listeners)
listener.onUpdateFunction(udf.name().keyspace, udf.name().name, udf.argTypes());
}
public void notifyUpdateAggregate(UDAggregate udf)
{
for (MigrationListener listener : listeners)
listener.onUpdateAggregate(udf.name().keyspace, udf.name().name, udf.argTypes());
}
public void notifyDropKeyspace(KeyspaceMetadata 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 notifyDropView(ViewDefinition view)
{
for (MigrationListener listener : listeners)
listener.onDropView(view.ksName, view.viewName);
}
public void notifyDropUserType(UserType ut)
{
for (MigrationListener listener : listeners)
listener.onDropUserType(ut.keyspace, ut.getNameAsString());
}
public void notifyDropFunction(UDFunction udf)
{
for (MigrationListener listener : listeners)
listener.onDropFunction(udf.name().keyspace, udf.name().name, udf.argTypes());
}
public void notifyDropAggregate(UDAggregate udf)
{
for (MigrationListener listener : listeners)
listener.onDropAggregate(udf.name().keyspace, udf.name().name, udf.argTypes());
}
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.getKSMetaData(ksm.name) != null)
throw new AlreadyExistsException(ksm.name);
logger.info("Create new Keyspace: {}", ksm);
announce(SchemaKeyspace.makeCreateKeyspaceMutation(ksm, timestamp), announceLocally);
}
public static void announceNewColumnFamily(CFMetaData cfm) throws ConfigurationException
{
announceNewColumnFamily(cfm, false);
}
public static void announceNewColumnFamily(CFMetaData cfm, boolean announceLocally) throws ConfigurationException
{
announceNewColumnFamily(cfm, announceLocally, true);
}
/**
* Announces the table even if the definition is already know locally.
* This should generally be avoided but is used internally when we want to force the most up to date version of
* a system table schema (Note that we don't know if the schema we force _is_ the most recent version or not, we
* just rely on idempotency to basically ignore that announce if it's not. That's why we can't use announceUpdateColumnFamily,
* it would for instance delete new columns if this is not called with the most up-to-date version)
*
* Note that this is only safe for system tables where we know the cfId is fixed and will be the same whatever version
* of the definition is used.
*/
public static void forceAnnounceNewColumnFamily(CFMetaData cfm) throws ConfigurationException
{
announceNewColumnFamily(cfm, false, false, 0);
}
private static void announceNewColumnFamily(CFMetaData cfm, boolean announceLocally, boolean throwOnDuplicate) throws ConfigurationException
{
announceNewColumnFamily(cfm, announceLocally, throwOnDuplicate, FBUtilities.timestampMicros());
}
private static void announceNewColumnFamily(CFMetaData cfm, boolean announceLocally, boolean throwOnDuplicate, long timestamp) throws ConfigurationException
{
cfm.validate();
KeyspaceMetadata ksm = Schema.instance.getKSMetaData(cfm.ksName);
if (ksm == null)
throw new ConfigurationException(String.format("Cannot add table '%s' to non existing keyspace '%s'.", cfm.cfName, cfm.ksName));
// 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.cfName) != null)
throw new AlreadyExistsException(cfm.ksName, cfm.cfName);
logger.info("Create new table: {}", cfm);
announce(SchemaKeyspace.makeCreateTableMutation(ksm, cfm, timestamp), announceLocally);
}
public static void announceNewView(ViewDefinition view, boolean announceLocally) throws ConfigurationException
{
view.metadata.validate();
KeyspaceMetadata ksm = Schema.instance.getKSMetaData(view.ksName);
if (ksm == null)
throw new ConfigurationException(String.format("Cannot add table '%s' to non existing keyspace '%s'.", view.viewName, view.ksName));
else if (ksm.getTableOrViewNullable(view.viewName) != null)
throw new AlreadyExistsException(view.ksName, view.viewName);
logger.info("Create new view: {}", view);
announce(SchemaKeyspace.makeCreateViewMutation(ksm, view, FBUtilities.timestampMicros()), announceLocally);
}
public static void announceNewType(UserType newType, boolean announceLocally)
{
KeyspaceMetadata ksm = Schema.instance.getKSMetaData(newType.keyspace);
announce(SchemaKeyspace.makeCreateTypeMutation(ksm, newType, FBUtilities.timestampMicros()), announceLocally);
}
public static void announceNewFunction(UDFunction udf, boolean announceLocally)
{
logger.info("Create scalar function '{}'", udf.name());
KeyspaceMetadata ksm = Schema.instance.getKSMetaData(udf.name().keyspace);
announce(SchemaKeyspace.makeCreateFunctionMutation(ksm, udf, FBUtilities.timestampMicros()), announceLocally);
}
public static void announceNewAggregate(UDAggregate udf, boolean announceLocally)
{
logger.info("Create aggregate function '{}'", udf.name());
KeyspaceMetadata ksm = Schema.instance.getKSMetaData(udf.name().keyspace);
announce(SchemaKeyspace.makeCreateAggregateMutation(ksm, udf, FBUtilities.timestampMicros()), announceLocally);
}
public static void announceKeyspaceUpdate(KeyspaceMetadata ksm) throws ConfigurationException
{
announceKeyspaceUpdate(ksm, false);
}
public static void announceKeyspaceUpdate(KeyspaceMetadata ksm, boolean announceLocally) throws ConfigurationException
{
ksm.validate();
KeyspaceMetadata oldKsm = Schema.instance.getKSMetaData(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()), announceLocally);
}
public static void announceColumnFamilyUpdate(CFMetaData cfm) throws ConfigurationException
{
announceColumnFamilyUpdate(cfm, false);
}
public static void announceColumnFamilyUpdate(CFMetaData cfm, boolean announceLocally) throws ConfigurationException
{
announceColumnFamilyUpdate(cfm, null, announceLocally);
}
public static void announceColumnFamilyUpdate(CFMetaData cfm, Collection views, 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 table '%s' in keyspace '%s'.", cfm.cfName, cfm.ksName));
KeyspaceMetadata ksm = Schema.instance.getKSMetaData(cfm.ksName);
oldCfm.validateCompatibility(cfm);
long timestamp = FBUtilities.timestampMicros();
logger.info("Update table '{}/{}' From {} To {}", cfm.ksName, cfm.cfName, oldCfm, cfm);
Mutation.SimpleBuilder builder = SchemaKeyspace.makeUpdateTableMutation(ksm, oldCfm, cfm, timestamp);
if (views != null)
views.forEach(view -> addViewUpdateToMutationBuilder(view, builder));
announce(builder, announceLocally);
}
public static void announceViewUpdate(ViewDefinition view, boolean announceLocally) throws ConfigurationException
{
KeyspaceMetadata ksm = Schema.instance.getKSMetaData(view.ksName);
long timestamp = FBUtilities.timestampMicros();
Mutation.SimpleBuilder builder = SchemaKeyspace.makeCreateKeyspaceMutation(ksm.name, ksm.params, timestamp);
addViewUpdateToMutationBuilder(view, builder);
announce(builder, announceLocally);
}
private static void addViewUpdateToMutationBuilder(ViewDefinition view, Mutation.SimpleBuilder builder)
{
view.metadata.validate();
ViewDefinition oldView = Schema.instance.getView(view.ksName, view.viewName);
if (oldView == null)
throw new ConfigurationException(String.format("Cannot update non existing materialized view '%s' in keyspace '%s'.", view.viewName, view.ksName));
oldView.metadata.validateCompatibility(view.metadata);
logger.info("Update view '{}/{}' From {} To {}", view.ksName, view.viewName, oldView, view);
SchemaKeyspace.makeUpdateViewMutation(builder, oldView, view);
}
public static void announceTypeUpdate(UserType updatedType, boolean announceLocally)
{
logger.info("Update type '{}.{}' to {}", updatedType.keyspace, updatedType.getNameAsString(), updatedType);
announceNewType(updatedType, announceLocally);
}
public static void announceKeyspaceDrop(String ksName) throws ConfigurationException
{
announceKeyspaceDrop(ksName, false);
}
public static void announceKeyspaceDrop(String ksName, boolean announceLocally) throws ConfigurationException
{
KeyspaceMetadata oldKsm = Schema.instance.getKSMetaData(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()), 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 table '%s' in keyspace '%s'.", cfName, ksName));
KeyspaceMetadata ksm = Schema.instance.getKSMetaData(ksName);
logger.info("Drop table '{}/{}'", oldCfm.ksName, oldCfm.cfName);
announce(SchemaKeyspace.makeDropTableMutation(ksm, oldCfm, FBUtilities.timestampMicros()), announceLocally);
}
public static void announceViewDrop(String ksName, String viewName, boolean announceLocally) throws ConfigurationException
{
ViewDefinition view = Schema.instance.getView(ksName, viewName);
if (view == null)
throw new ConfigurationException(String.format("Cannot drop non existing materialized view '%s' in keyspace '%s'.", viewName, ksName));
KeyspaceMetadata ksm = Schema.instance.getKSMetaData(ksName);
logger.info("Drop table '{}/{}'", view.ksName, view.viewName);
announce(SchemaKeyspace.makeDropViewMutation(ksm, view, FBUtilities.timestampMicros()), announceLocally);
}
public static void announceTypeDrop(UserType droppedType)
{
announceTypeDrop(droppedType, false);
}
public static void announceTypeDrop(UserType droppedType, boolean announceLocally)
{
KeyspaceMetadata ksm = Schema.instance.getKSMetaData(droppedType.keyspace);
announce(SchemaKeyspace.dropTypeFromSchemaMutation(ksm, droppedType, FBUtilities.timestampMicros()), announceLocally);
}
public static void announceFunctionDrop(UDFunction udf, boolean announceLocally)
{
logger.info("Drop scalar function overload '{}' args '{}'", udf.name(), udf.argTypes());
KeyspaceMetadata ksm = Schema.instance.getKSMetaData(udf.name().keyspace);
announce(SchemaKeyspace.makeDropFunctionMutation(ksm, udf, FBUtilities.timestampMicros()), announceLocally);
}
public static void announceAggregateDrop(UDAggregate udf, boolean announceLocally)
{
logger.info("Drop aggregate function overload '{}' args '{}'", udf.name(), udf.argTypes());
KeyspaceMetadata ksm = Schema.instance.getKSMetaData(udf.name().keyspace);
announce(SchemaKeyspace.makeDropAggregateMutation(ksm, udf, 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)
SchemaKeyspace.mergeSchema(mutations);
else
FBUtilities.waitOnFuture(announce(mutations));
}
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 ConfigurationException
{
SchemaKeyspace.mergeSchemaAndAnnounceVersion(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) &&
is30Compatible(MessagingService.instance().getRawVersion(endpoint)))
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
* @param compatible flag whether {@code version} is a 3.0 compatible version
*/
public static void passiveAnnounce(UUID version, boolean compatible)
{
Gossiper.instance.addLocalApplicationState(ApplicationState.SCHEMA, StorageService.instance.valueFactory.schema(version));
logger.debug("Gossiping my {} schema version {}",
compatible ? "3.0 compatible" : "3.11",
Schema.schemaVersionToString(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.
*/
public static void resetLocalSchema()
{
logger.info("Starting local schema reset...");
logger.debug("Truncating schema tables...");
SchemaKeyspace.truncate();
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(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.serializer.serializedSize(mutation, version);
return size;
}
}
}