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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.indices.recovery;
import org.elasticsearch.ExceptionsHelper;
import org.elasticsearch.cluster.ClusterService;
import org.elasticsearch.cluster.routing.RoutingNode;
import org.elasticsearch.cluster.routing.ShardRouting;
import org.elasticsearch.common.Nullable;
import org.elasticsearch.common.component.AbstractComponent;
import org.elasticsearch.common.inject.Inject;
import org.elasticsearch.common.settings.Settings;
import org.elasticsearch.index.IndexService;
import org.elasticsearch.index.shard.IndexEventListener;
import org.elasticsearch.index.shard.IndexShard;
import org.elasticsearch.index.shard.ShardId;
import org.elasticsearch.indices.IndicesService;
import org.elasticsearch.threadpool.ThreadPool;
import org.elasticsearch.transport.TransportChannel;
import org.elasticsearch.transport.TransportRequestHandler;
import org.elasticsearch.transport.TransportService;
import java.util.*;
/**
* The source recovery accepts recovery requests from other peer shards and start the recovery process from this
* source shard to the target shard.
*/
public class RecoverySource extends AbstractComponent implements IndexEventListener{
public static class Actions {
public static final String START_RECOVERY = "internal:index/shard/recovery/start_recovery";
}
private final TransportService transportService;
private final IndicesService indicesService;
private final RecoverySettings recoverySettings;
private final ClusterService clusterService;
private final OngoingRecoveres ongoingRecoveries = new OngoingRecoveres();
@Inject
public RecoverySource(Settings settings, TransportService transportService, IndicesService indicesService,
RecoverySettings recoverySettings, ClusterService clusterService) {
super(settings);
this.transportService = transportService;
this.indicesService = indicesService;
this.clusterService = clusterService;
this.recoverySettings = recoverySettings;
transportService.registerRequestHandler(Actions.START_RECOVERY, StartRecoveryRequest::new, ThreadPool.Names.GENERIC, new StartRecoveryTransportRequestHandler());
}
@Override
public void beforeIndexShardClosed(ShardId shardId, @Nullable IndexShard indexShard,
Settings indexSettings) {
if (indexShard != null) {
ongoingRecoveries.cancel(indexShard, "shard is closed");
}
}
private RecoveryResponse recover(final StartRecoveryRequest request) {
final IndexService indexService = indicesService.indexServiceSafe(request.shardId().index().name());
final IndexShard shard = indexService.getShard(request.shardId().id());
// starting recovery from that our (the source) shard state is marking the shard to be in recovery mode as well, otherwise
// the index operations will not be routed to it properly
RoutingNode node = clusterService.state().getRoutingNodes().node(request.targetNode().id());
if (node == null) {
logger.debug("delaying recovery of {} as source node {} is unknown", request.shardId(), request.targetNode());
throw new DelayRecoveryException("source node does not have the node [" + request.targetNode() + "] in its state yet..");
}
ShardRouting targetShardRouting = null;
for (ShardRouting shardRouting : node) {
if (shardRouting.shardId().equals(request.shardId())) {
targetShardRouting = shardRouting;
break;
}
}
if (targetShardRouting == null) {
logger.debug("delaying recovery of {} as it is not listed as assigned to target node {}", request.shardId(), request.targetNode());
throw new DelayRecoveryException("source node does not have the shard listed in its state as allocated on the node");
}
if (!targetShardRouting.initializing()) {
logger.debug("delaying recovery of {} as it is not listed as initializing on the target node {}. known shards state is [{}]",
request.shardId(), request.targetNode(), targetShardRouting.state());
throw new DelayRecoveryException("source node has the state of the target shard to be [" + targetShardRouting.state() + "], expecting to be [initializing]");
}
logger.trace("[{}][{}] starting recovery to {}, mark_as_relocated {}", request.shardId().index().name(), request.shardId().id(), request.targetNode(), request.markAsRelocated());
final RecoverySourceHandler handler;
if (shard.indexSettings().isOnSharedFilesystem()) {
handler = new SharedFSRecoverySourceHandler(shard, request, recoverySettings, transportService, logger);
} else {
handler = new RecoverySourceHandler(shard, request, recoverySettings, transportService, logger);
}
ongoingRecoveries.add(shard, handler);
try {
return handler.recoverToTarget();
} finally {
ongoingRecoveries.remove(shard, handler);
}
}
class StartRecoveryTransportRequestHandler implements TransportRequestHandler<StartRecoveryRequest> {
@Override
public void messageReceived(final StartRecoveryRequest request, final TransportChannel channel) throws Exception {
RecoveryResponse response = recover(request);
channel.sendResponse(response);
}
}
private static final class OngoingRecoveres {
private final Map<IndexShard, Set<RecoverySourceHandler>> ongoingRecoveries = new HashMap<>();
synchronized void add(IndexShard shard, RecoverySourceHandler handler) {
Set<RecoverySourceHandler> shardRecoveryHandlers = ongoingRecoveries.get(shard);
if (shardRecoveryHandlers == null) {
shardRecoveryHandlers = new HashSet<>();
ongoingRecoveries.put(shard, shardRecoveryHandlers);
}
assert shardRecoveryHandlers.contains(handler) == false : "Handler was already registered [" + handler + "]";
shardRecoveryHandlers.add(handler);
shard.recoveryStats().incCurrentAsSource();
}
synchronized void remove(IndexShard shard, RecoverySourceHandler handler) {
final Set<RecoverySourceHandler> shardRecoveryHandlers = ongoingRecoveries.get(shard);
assert shardRecoveryHandlers != null : "Shard was not registered [" + shard + "]";
boolean remove = shardRecoveryHandlers.remove(handler);
assert remove : "Handler was not registered [" + handler + "]";
if (remove) {
shard.recoveryStats().decCurrentAsSource();
}
if (shardRecoveryHandlers.isEmpty()) {
ongoingRecoveries.remove(shard);
}
}
synchronized void cancel(IndexShard shard, String reason) {
final Set<RecoverySourceHandler> shardRecoveryHandlers = ongoingRecoveries.get(shard);
if (shardRecoveryHandlers != null) {
final List<Exception> failures = new ArrayList<>();
for (RecoverySourceHandler handlers : shardRecoveryHandlers) {
try {
handlers.cancel(reason);
} catch (Exception ex) {
failures.add(ex);
} finally {
shard.recoveryStats().decCurrentAsSource();
}
}
ExceptionsHelper.maybeThrowRuntimeAndSuppress(failures);
}
}
}
}
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