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com.hazelcast.partition.impl.PromoteFromBackupOperation Maven / Gradle / Ivy
/*
* Copyright (c) 2008-2016, Hazelcast, Inc. All Rights Reserved.
*
* 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.
*/
package com.hazelcast.partition.impl;
import com.hazelcast.core.Member;
import com.hazelcast.core.MigrationEvent;
import com.hazelcast.core.MigrationEvent.MigrationStatus;
import com.hazelcast.instance.MemberImpl;
import com.hazelcast.logging.ILogger;
import com.hazelcast.nio.Address;
import com.hazelcast.nio.ObjectDataInput;
import com.hazelcast.nio.ObjectDataOutput;
import com.hazelcast.partition.InternalPartition;
import com.hazelcast.partition.InternalPartitionLostEvent;
import com.hazelcast.partition.InternalPartitionService;
import com.hazelcast.partition.MigrationCycleOperation;
import com.hazelcast.spi.AbstractOperation;
import com.hazelcast.spi.EventRegistration;
import com.hazelcast.spi.EventService;
import com.hazelcast.spi.MigrationAwareService;
import com.hazelcast.spi.NodeEngine;
import com.hazelcast.spi.PartitionAwareOperation;
import com.hazelcast.spi.PartitionAwareService;
import com.hazelcast.spi.PartitionMigrationEvent;
import com.hazelcast.spi.impl.NodeEngineImpl;
import java.io.IOException;
import java.util.Arrays;
import java.util.Collection;
import static com.hazelcast.core.MigrationEvent.MigrationStatus.COMPLETED;
import static com.hazelcast.core.MigrationEvent.MigrationStatus.STARTED;
import static com.hazelcast.partition.InternalPartitionService.MIGRATION_EVENT_TOPIC;
import static com.hazelcast.partition.InternalPartitionService.SERVICE_NAME;
import static com.hazelcast.partition.MigrationEndpoint.DESTINATION;
import static com.hazelcast.partition.impl.PartitionReplicaChangeReason.MEMBER_REMOVED;
import static com.hazelcast.spi.ExecutionService.SYSTEM_EXECUTOR;
// Runs locally when the node becomes owner of a partition
//
// Finds the replica indices that are on the sync-waiting state. Those indices represents the lost backups of the partition.
// Therefore, it publishes InternalPartitionLostEvent objects to notify related services. It also updates the version for the
// lost replicas to the first available version value after the lost backups, or 0 if N/A
final class PromoteFromBackupOperation
extends AbstractOperation
implements PartitionAwareOperation, MigrationCycleOperation {
private final PartitionReplicaChangeReason reason;
private final Address oldAddress;
private ILogger logger;
public PromoteFromBackupOperation(PartitionReplicaChangeReason reason, Address oldAddress) {
this.reason = reason;
this.oldAddress = oldAddress;
}
void initLogger() {
logger = getLogger();
}
@Override
public void beforeRun()
throws Exception {
initLogger();
sendMigrationEvent(STARTED);
}
@Override
public void run()
throws Exception {
handleLostBackups();
promoteFromBackups();
}
@Override
public void afterRun()
throws Exception {
sendMigrationEvent(COMPLETED);
}
private void sendMigrationEvent(final MigrationStatus status) {
if (reason != MEMBER_REMOVED) {
return;
}
final int partitionId = getPartitionId();
final NodeEngine nodeEngine = getNodeEngine();
final Member localMember = nodeEngine.getLocalMember();
final MemberImpl deadMember = new MemberImpl(oldAddress, false);
final MigrationEvent event = new MigrationEvent(partitionId, deadMember, localMember, status);
final EventService eventService = nodeEngine.getEventService();
final Collection registrations = eventService.getRegistrations(SERVICE_NAME, MIGRATION_EVENT_TOPIC);
eventService.publishEvent(SERVICE_NAME, registrations, event, partitionId);
}
void handleLostBackups() {
final int partitionId = getPartitionId();
try {
final InternalPartitionService partitionService = getService();
// returns the internal array itself, not the copy
final long[] versions = partitionService.getPartitionReplicaVersions(partitionId);
if (reason == MEMBER_REMOVED) {
final int lostReplicaIndex = getLostReplicaIndex(versions);
if (lostReplicaIndex > 0) {
overwriteLostReplicaVersionsWithFirstAvailableVersion(partitionId, versions, lostReplicaIndex);
}
sendPartitionLostEvent(partitionId, lostReplicaIndex);
} else {
resetSyncWaitingVersions(partitionId, versions);
}
} catch (Throwable e) {
logger.warning("Partition lost detection failed. partitionId=" + partitionId, e);
}
}
void promoteFromBackups() {
if (reason != MEMBER_REMOVED) {
return;
}
if (logger.isFinestEnabled()) {
logger.finest("Promoting partitionId=" + getPartitionId());
}
try {
sendToAllMigrationAwareServices(new PartitionMigrationEvent(DESTINATION, getPartitionId()));
} finally {
clearPartitionMigratingFlag();
}
}
private int getLostReplicaIndex(final long[] versions) {
int biggestLostReplicaIndex = 0;
for (int replicaIndex = 1; replicaIndex <= versions.length; replicaIndex++) {
if (versions[replicaIndex - 1] == InternalPartition.SYNC_WAITING) {
biggestLostReplicaIndex = replicaIndex;
}
}
return biggestLostReplicaIndex;
}
private void overwriteLostReplicaVersionsWithFirstAvailableVersion(final int partitionId, final long[] versions,
final int lostReplicaIndex) {
if (logger.isFinestEnabled()) {
logger.finest("Partition replica is lost! partitionId=" + partitionId + " lost-replicaIndex=" + lostReplicaIndex
+ " replicaVersions=" + Arrays.toString(versions));
}
final long forcedVersion = lostReplicaIndex < versions.length ? versions[lostReplicaIndex] : 0;
for (int replicaIndex = lostReplicaIndex; replicaIndex > 0; replicaIndex--) {
versions[replicaIndex - 1] = forcedVersion;
}
}
private void resetSyncWaitingVersions(int partitionId, long[] versions) {
long[] versionsBeforeReset = null;
for (int replicaIndex = 1; replicaIndex <= versions.length; replicaIndex++) {
if (versions[replicaIndex - 1] == InternalPartition.SYNC_WAITING) {
if (versionsBeforeReset == null) {
versionsBeforeReset = Arrays.copyOf(versions, versions.length);
}
versions[replicaIndex - 1] = 0;
}
}
if (logger.isFinestEnabled() && versionsBeforeReset != null) {
logger.finest("Resetting all SYNC_WAITING Versions. partitionId=" + partitionId + " versionsBeforeReset=" + Arrays
.toString(versionsBeforeReset));
}
}
private void sendPartitionLostEvent(int partitionId, int lostReplicaIndex) {
final InternalPartitionLostEvent event = new InternalPartitionLostEvent(partitionId, lostReplicaIndex,
getNodeEngine().getThisAddress());
final NodeEngineImpl nodeEngine = (NodeEngineImpl) getNodeEngine();
final InternalPartitionLostEventPublisher publisher = new InternalPartitionLostEventPublisher(nodeEngine, event);
nodeEngine.getExecutionService().execute(SYSTEM_EXECUTOR, publisher);
}
private void sendToAllMigrationAwareServices(PartitionMigrationEvent event) {
final NodeEngineImpl nodeEngine = (NodeEngineImpl) getNodeEngine();
for (MigrationAwareService service : nodeEngine.getServices(MigrationAwareService.class)) {
try {
service.beforeMigration(event);
service.commitMigration(event);
} catch (Throwable e) {
getLogger().warning("While promoting partitionId=" + getPartitionId(), e);
}
}
}
private void clearPartitionMigratingFlag() {
final InternalPartitionServiceImpl service = getService();
final InternalPartitionImpl partition = service.getPartition(getPartitionId());
partition.setMigrating(false);
}
@Override
public boolean returnsResponse() {
return false;
}
@Override
public boolean validatesTarget() {
return false;
}
@Override
protected void readInternal(ObjectDataInput in)
throws IOException {
throw new UnsupportedOperationException();
}
@Override
protected void writeInternal(ObjectDataOutput out)
throws IOException {
throw new UnsupportedOperationException();
}
static class InternalPartitionLostEventPublisher
implements Runnable {
private final NodeEngineImpl nodeEngine;
private final InternalPartitionLostEvent event;
public InternalPartitionLostEventPublisher(NodeEngineImpl nodeEngine, InternalPartitionLostEvent event) {
this.nodeEngine = nodeEngine;
this.event = event;
}
@Override
public void run() {
for (PartitionAwareService service : nodeEngine.getServices(PartitionAwareService.class)) {
try {
service.onPartitionLost(event);
} catch (Exception e) {
final ILogger logger = nodeEngine.getLogger(InternalPartitionLostEventPublisher.class);
logger.warning("Handling partitionLostEvent failed. Service: " + service.getClass() + " Event: " + event, e);
}
}
}
public InternalPartitionLostEvent getEvent() {
return event;
}
}
}
