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package org.apache.solr.cloud;
/*
* 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.
*/
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.ExecutorService;
import org.apache.http.client.HttpClient;
import org.apache.solr.client.solrj.SolrServerException;
import org.apache.solr.client.solrj.impl.HttpSolrServer;
import org.apache.solr.client.solrj.request.CoreAdminRequest.RequestRecovery;
import org.apache.solr.common.SolrException;
import org.apache.solr.common.SolrException.ErrorCode;
import org.apache.solr.common.cloud.ZkCoreNodeProps;
import org.apache.solr.common.cloud.ZkNodeProps;
import org.apache.solr.common.cloud.ZkStateReader;
import org.apache.solr.common.params.CoreAdminParams.CoreAdminAction;
import org.apache.solr.common.params.ModifiableSolrParams;
import org.apache.solr.common.util.NamedList;
import org.apache.solr.core.CoreContainer;
import org.apache.solr.core.CoreDescriptor;
import org.apache.solr.core.SolrCore;
import org.apache.solr.handler.component.ShardHandler;
import org.apache.solr.handler.component.ShardRequest;
import org.apache.solr.handler.component.ShardResponse;
import org.apache.solr.request.LocalSolrQueryRequest;
import org.apache.solr.request.SolrQueryRequest;
import org.apache.solr.request.SolrRequestInfo;
import org.apache.solr.response.SolrQueryResponse;
import org.apache.solr.update.PeerSync;
import org.apache.solr.update.UpdateShardHandler;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
public class SyncStrategy {
protected final Logger log = LoggerFactory.getLogger(getClass());
private final boolean SKIP_AUTO_RECOVERY = Boolean.getBoolean("solrcloud.skip.autorecovery");
private final ShardHandler shardHandler;
private volatile boolean isClosed;
private final HttpClient client;
private final ExecutorService updateExecutor;
public SyncStrategy(CoreContainer cc) {
UpdateShardHandler updateShardHandler = cc.getUpdateShardHandler();
client = updateShardHandler.getHttpClient();
shardHandler = cc.getShardHandlerFactory().getShardHandler();
updateExecutor = updateShardHandler.getUpdateExecutor();
}
private static class ShardCoreRequest extends ShardRequest {
String coreName;
public String baseUrl;
}
public boolean sync(ZkController zkController, SolrCore core, ZkNodeProps leaderProps) {
return sync(zkController, core, leaderProps, false);
}
public boolean sync(ZkController zkController, SolrCore core, ZkNodeProps leaderProps, boolean peerSyncOnlyWithActive) {
if (SKIP_AUTO_RECOVERY) {
return true;
}
boolean success;
SolrQueryRequest req = new LocalSolrQueryRequest(core, new ModifiableSolrParams());
SolrQueryResponse rsp = new SolrQueryResponse();
SolrRequestInfo.setRequestInfo(new SolrRequestInfo(req, rsp));
try {
if (isClosed) {
log.warn("Closed, skipping sync up.");
return false;
}
log.info("Sync replicas to " + ZkCoreNodeProps.getCoreUrl(leaderProps));
if (core.getUpdateHandler().getUpdateLog() == null) {
log.error("No UpdateLog found - cannot sync");
return false;
}
success = syncReplicas(zkController, core, leaderProps, peerSyncOnlyWithActive);
} finally {
SolrRequestInfo.clearRequestInfo();
}
return success;
}
private boolean syncReplicas(ZkController zkController, SolrCore core,
ZkNodeProps leaderProps, boolean peerSyncOnlyWithActive) {
boolean success = false;
CloudDescriptor cloudDesc = core.getCoreDescriptor().getCloudDescriptor();
String collection = cloudDesc.getCollectionName();
String shardId = cloudDesc.getShardId();
if (isClosed) {
log.info("We have been closed, won't sync with replicas");
return false;
}
// first sync ourselves - we are the potential leader after all
try {
success = syncWithReplicas(zkController, core, leaderProps, collection,
shardId, peerSyncOnlyWithActive);
} catch (Exception e) {
SolrException.log(log, "Sync Failed", e);
}
try {
if (isClosed) {
log.info("We have been closed, won't attempt to sync replicas back to leader");
return false;
}
if (success) {
log.info("Sync Success - now sync replicas to me");
syncToMe(zkController, collection, shardId, leaderProps, core.getCoreDescriptor());
} else {
log.info("Leader's attempt to sync with shard failed, moving to the next candidate");
// lets see who seems ahead...
}
} catch (Exception e) {
SolrException.log(log, "Sync Failed", e);
}
return success;
}
private boolean syncWithReplicas(ZkController zkController, SolrCore core,
ZkNodeProps props, String collection, String shardId, boolean peerSyncOnlyWithActive) {
List nodes = zkController.getZkStateReader()
.getReplicaProps(collection, shardId,core.getCoreDescriptor().getCloudDescriptor().getCoreNodeName(),
props.getStr(ZkStateReader.CORE_NAME_PROP));
if (nodes == null) {
// I have no replicas
return true;
}
List syncWith = new ArrayList();
for (ZkCoreNodeProps node : nodes) {
syncWith.add(node.getCoreUrl());
}
// if we can't reach a replica for sync, we still consider the overall sync a success
// TODO: as an assurance, we should still try and tell the sync nodes that we couldn't reach
// to recover once more?
PeerSync peerSync = new PeerSync(core, syncWith, core.getUpdateHandler().getUpdateLog().numRecordsToKeep, true, true, peerSyncOnlyWithActive);
return peerSync.sync();
}
private void syncToMe(ZkController zkController, String collection,
String shardId, ZkNodeProps leaderProps, CoreDescriptor cd) {
// sync everyone else
// TODO: we should do this in parallel at least
List nodes = zkController
.getZkStateReader()
.getReplicaProps(collection, shardId,
cd.getCloudDescriptor().getCoreNodeName(),
leaderProps.getStr(ZkStateReader.CORE_NAME_PROP));
if (nodes == null) {
log.info(ZkCoreNodeProps.getCoreUrl(leaderProps) + " has no replicas");
return;
}
ZkCoreNodeProps zkLeader = new ZkCoreNodeProps(leaderProps);
for (ZkCoreNodeProps node : nodes) {
try {
log.info(ZkCoreNodeProps.getCoreUrl(leaderProps) + ": try and ask " + node.getCoreUrl() + " to sync");
requestSync(node.getBaseUrl(), node.getCoreUrl(), zkLeader.getCoreUrl(), node.getCoreName());
} catch (Exception e) {
SolrException.log(log, "Error syncing replica to leader", e);
}
}
for(;;) {
ShardResponse srsp = shardHandler.takeCompletedOrError();
if (srsp == null) break;
boolean success = handleResponse(srsp);
if (srsp.getException() != null) {
SolrException.log(log, "Sync request error: " + srsp.getException());
}
if (!success) {
try {
log.info(ZkCoreNodeProps.getCoreUrl(leaderProps) + ": Sync failed - asking replica (" + srsp.getShardAddress() + ") to recover.");
if (isClosed) {
log.info("We have been closed, don't request that a replica recover");
} else {
requestRecovery(leaderProps, ((ShardCoreRequest)srsp.getShardRequest()).baseUrl, ((ShardCoreRequest)srsp.getShardRequest()).coreName);
}
} catch (Exception e) {
SolrException.log(log, ZkCoreNodeProps.getCoreUrl(leaderProps) + ": Could not tell a replica to recover", e);
}
} else {
log.info(ZkCoreNodeProps.getCoreUrl(leaderProps) + ": " + " sync completed with " + srsp.getShardAddress());
}
}
}
private boolean handleResponse(ShardResponse srsp) {
NamedList
