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/*
* Licensed to Elasticsearch under one or more contributor
* license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright
* ownership. Elasticsearch 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.elasticsearch.action.resync;
import org.apache.logging.log4j.message.ParameterizedMessage;
import org.elasticsearch.action.ActionListener;
import org.elasticsearch.action.support.ActionFilters;
import org.elasticsearch.action.support.replication.ReplicationOperation;
import org.elasticsearch.action.support.replication.ReplicationResponse;
import org.elasticsearch.action.support.replication.TransportReplicationAction;
import org.elasticsearch.action.support.replication.TransportWriteAction;
import org.elasticsearch.cluster.action.shard.ShardStateAction;
import org.elasticsearch.cluster.block.ClusterBlockLevel;
import org.elasticsearch.cluster.routing.ShardRouting;
import org.elasticsearch.cluster.service.ClusterService;
import org.elasticsearch.common.inject.Inject;
import org.elasticsearch.common.io.stream.StreamInput;
import org.elasticsearch.common.settings.Settings;
import org.elasticsearch.index.engine.Engine;
import org.elasticsearch.index.seqno.SequenceNumbers;
import org.elasticsearch.index.shard.IndexShard;
import org.elasticsearch.index.shard.PrimaryReplicaSyncer;
import org.elasticsearch.index.translog.Translog;
import org.elasticsearch.indices.IndicesService;
import org.elasticsearch.tasks.Task;
import org.elasticsearch.threadpool.ThreadPool;
import org.elasticsearch.transport.TransportException;
import org.elasticsearch.transport.TransportResponseHandler;
import org.elasticsearch.transport.TransportService;
import java.io.IOException;
public class TransportResyncReplicationAction extends TransportWriteAction implements PrimaryReplicaSyncer.SyncAction {
private static String ACTION_NAME = "internal:index/seq_no/resync";
@Inject
public TransportResyncReplicationAction(Settings settings, TransportService transportService,
ClusterService clusterService, IndicesService indicesService, ThreadPool threadPool,
ShardStateAction shardStateAction, ActionFilters actionFilters) {
super(settings, ACTION_NAME, transportService, clusterService, indicesService, threadPool, shardStateAction, actionFilters,
ResyncReplicationRequest::new, ResyncReplicationRequest::new, ThreadPool.Names.WRITE,
true /* we should never reject resync because of thread pool capacity on primary */);
}
@Override
protected ResyncReplicationResponse newResponseInstance(StreamInput in) throws IOException {
return new ResyncReplicationResponse(in);
}
@Override
protected ReplicationOperation.Replicas newReplicasProxy() {
return new ResyncActionReplicasProxy();
}
@Override
protected ClusterBlockLevel globalBlockLevel() {
// resync should never be blocked because it's an internal action
return null;
}
@Override
public ClusterBlockLevel indexBlockLevel() {
// resync should never be blocked because it's an internal action
return null;
}
@Override
protected void shardOperationOnPrimary(ResyncReplicationRequest request, IndexShard primary,
ActionListener> listener) {
ActionListener.completeWith(listener,
() -> new WritePrimaryResult<>(performOnPrimary(request), new ResyncReplicationResponse(), null, null, primary, logger));
}
public static ResyncReplicationRequest performOnPrimary(ResyncReplicationRequest request) {
return request;
}
@Override
protected WriteReplicaResult shardOperationOnReplica(ResyncReplicationRequest request,
IndexShard replica) throws Exception {
Translog.Location location = performOnReplica(request, replica);
return new WriteReplicaResult<>(request, location, null, replica, logger);
}
public static Translog.Location performOnReplica(ResyncReplicationRequest request, IndexShard replica) throws Exception {
Translog.Location location = null;
/*
* Operations received from resync do not have auto_id_timestamp individually, we need to bootstrap this max_seen_timestamp
* (at least the highest timestamp from any of these operations) to make sure that we will disable optimization for the same
* append-only requests with timestamp (sources of these operations) that are replicated; otherwise we may have duplicates.
*/
replica.updateMaxUnsafeAutoIdTimestamp(request.getMaxSeenAutoIdTimestampOnPrimary());
for (Translog.Operation operation : request.getOperations()) {
final Engine.Result operationResult = replica.applyTranslogOperation(operation, Engine.Operation.Origin.REPLICA);
if (operationResult.getResultType() == Engine.Result.Type.MAPPING_UPDATE_REQUIRED) {
throw new TransportReplicationAction.RetryOnReplicaException(replica.shardId(),
"Mappings are not available on the replica yet, triggered update: " + operationResult.getRequiredMappingUpdate());
}
location = syncOperationResultOrThrow(operationResult, location);
}
if (request.getTrimAboveSeqNo() != SequenceNumbers.UNASSIGNED_SEQ_NO) {
replica.trimOperationOfPreviousPrimaryTerms(request.getTrimAboveSeqNo());
}
return location;
}
@Override
public void sync(ResyncReplicationRequest request, Task parentTask, String primaryAllocationId, long primaryTerm,
ActionListener listener) {
// skip reroute phase
transportService.sendChildRequest(
clusterService.localNode(),
transportPrimaryAction,
new ConcreteShardRequest<>(request, primaryAllocationId, primaryTerm),
parentTask,
transportOptions,
new TransportResponseHandler() {
@Override
public ResyncReplicationResponse read(StreamInput in) throws IOException {
return newResponseInstance(in);
}
@Override
public String executor() {
return ThreadPool.Names.SAME;
}
@Override
public void handleResponse(ResyncReplicationResponse response) {
final ReplicationResponse.ShardInfo.Failure[] failures = response.getShardInfo().getFailures();
// noinspection ForLoopReplaceableByForEach
for (int i = 0; i < failures.length; i++) {
final ReplicationResponse.ShardInfo.Failure f = failures[i];
logger.info(
new ParameterizedMessage(
"{} primary-replica resync to replica on node [{}] failed", f.fullShardId(), f.nodeId()),
f.getCause());
}
listener.onResponse(response);
}
@Override
public void handleException(TransportException exp) {
listener.onFailure(exp);
}
});
}
/**
* A proxy for primary-replica resync operations which are performed on replicas when a new primary is promoted.
* Replica shards fail to execute resync operations will be failed but won't be marked as stale.
* This avoids marking shards as stale during cluster restart but enforces primary-replica resync mandatory.
*/
class ResyncActionReplicasProxy extends ReplicasProxy {
@Override
public void failShardIfNeeded(ShardRouting replica, long primaryTerm, String message, Exception exception,
ActionListener listener) {
shardStateAction.remoteShardFailed(
replica.shardId(), replica.allocationId().getId(), primaryTerm, false, message, exception, listener);
}
}
}