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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.solr.cloud;
import java.io.IOException;
import java.lang.invoke.MethodHandles;
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.HttpSolrClient;
import org.apache.solr.client.solrj.request.CoreAdminRequest.RequestRecovery;
import org.apache.solr.common.SolrException;
import org.apache.solr.common.cloud.ZkCoreNodeProps;
import org.apache.solr.common.cloud.ZkNodeProps;
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.HttpShardHandlerFactory;
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.update.PeerSync;
import org.apache.solr.update.UpdateShardHandler;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import static org.apache.solr.common.params.CommonParams.DISTRIB;
public class SyncStrategy {
private static final Logger log = LoggerFactory.getLogger(MethodHandles.lookup().lookupClass());
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;
private final List recoveryRequests = new ArrayList<>();
private static class RecoveryRequest {
ZkNodeProps leaderProps;
String baseUrl;
String coreName;
}
public SyncStrategy(CoreContainer cc) {
UpdateShardHandler updateShardHandler = cc.getUpdateShardHandler();
client = updateShardHandler.getDefaultHttpClient();
shardHandler = ((HttpShardHandlerFactory)cc.getShardHandlerFactory()).getShardHandler(cc.getUpdateShardHandler().getDefaultHttpClient());
updateExecutor = updateShardHandler.getUpdateExecutor();
}
private static class ShardCoreRequest extends ShardRequest {
String coreName;
public String baseUrl;
}
public PeerSync.PeerSyncResult sync(ZkController zkController, SolrCore core, ZkNodeProps leaderProps) {
return sync(zkController, core, leaderProps, false);
}
public PeerSync.PeerSyncResult sync(ZkController zkController, SolrCore core, ZkNodeProps leaderProps,
boolean peerSyncOnlyWithActive) {
if (SKIP_AUTO_RECOVERY) {
return PeerSync.PeerSyncResult.success();
}
if (isClosed) {
log.warn("Closed, skipping sync up.");
return PeerSync.PeerSyncResult.failure();
}
recoveryRequests.clear();
if (log.isInfoEnabled()) {
log.info("Sync replicas to {}", ZkCoreNodeProps.getCoreUrl(leaderProps));
}
if (core.getUpdateHandler().getUpdateLog() == null) {
log.error("No UpdateLog found - cannot sync");
return PeerSync.PeerSyncResult.failure();
}
return syncReplicas(zkController, core, leaderProps, peerSyncOnlyWithActive);
}
private PeerSync.PeerSyncResult syncReplicas(ZkController zkController, SolrCore core,
ZkNodeProps leaderProps, boolean peerSyncOnlyWithActive) {
if (isClosed) {
log.info("We have been closed, won't sync with replicas");
return PeerSync.PeerSyncResult.failure();
}
boolean success = false;
PeerSync.PeerSyncResult result = null;
assert core != null;
assert core.getCoreDescriptor() != null;
CloudDescriptor cloudDesc = core.getCoreDescriptor().getCloudDescriptor();
String collection = cloudDesc.getCollectionName();
String shardId = cloudDesc.getShardId();
// first sync ourselves - we are the potential leader after all
try {
result = syncWithReplicas(zkController, core, leaderProps, collection,
shardId, peerSyncOnlyWithActive);
success = result.isSuccess();
} 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 PeerSync.PeerSyncResult.failure();
}
if (success) {
log.info("Sync Success - now sync replicas to me");
syncToMe(zkController, collection, shardId, leaderProps, core.getCoreDescriptor(), core.getUpdateHandler().getUpdateLog().getNumRecordsToKeep());
} 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 result == null ? PeerSync.PeerSyncResult.failure() : result;
}
private PeerSync.PeerSyncResult syncWithReplicas(ZkController zkController, SolrCore core,
ZkNodeProps props, String collection, String shardId, boolean peerSyncOnlyWithActive) throws Exception {
List nodes = zkController.getZkStateReader()
.getReplicaProps(collection, shardId,core.getCoreDescriptor().getCloudDescriptor().getCoreNodeName());
if (isClosed) {
log.info("We have been closed, won't sync with replicas");
return PeerSync.PeerSyncResult.failure();
}
if (nodes == null) {
// I have no replicas
return PeerSync.PeerSyncResult.success();
}
List syncWith = new ArrayList<>(nodes.size());
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?
// Fingerprinting here is off because the we currently rely on having at least one of the nodes return "true", and if replicas are out-of-sync
// we still need to pick one as leader. A followup sync from the replica to the new leader (with fingerprinting on) should then fail and
// initiate recovery-by-replication.
try (PeerSync peerSync = new PeerSync(core, syncWith, core.getUpdateHandler().getUpdateLog().getNumRecordsToKeep(), true, peerSyncOnlyWithActive, false)) {
return peerSync.sync();
}
}
private void syncToMe(ZkController zkController, String collection,
String shardId, ZkNodeProps leaderProps, CoreDescriptor cd,
int nUpdates) {
if (isClosed) {
log.info("We have been closed, won't sync replicas to me.");
return;
}
// sync everyone else
// TODO: we should do this in parallel at least
List nodes = zkController
.getZkStateReader()
.getReplicaProps(collection, shardId,
cd.getCloudDescriptor().getCoreNodeName());
if (nodes == null) {
if (log.isInfoEnabled()) {
log.info("{} has no replicas", ZkCoreNodeProps.getCoreUrl(leaderProps));
}
return;
}
ZkCoreNodeProps zkLeader = new ZkCoreNodeProps(leaderProps);
for (ZkCoreNodeProps node : nodes) {
try {
if (log.isInfoEnabled()) {
log.info("{}: try and ask {} to sync", ZkCoreNodeProps.getCoreUrl(leaderProps), node.getCoreUrl());
}
requestSync(node.getBaseUrl(), node.getCoreUrl(), zkLeader.getCoreUrl(), node.getCoreName(), nUpdates);
} 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) {
if (log.isInfoEnabled()) {
log.info("{}: Sync failed - we will ask replica ({}) to recover."
, ZkCoreNodeProps.getCoreUrl(leaderProps), srsp.getShardAddress());
}
if (isClosed) {
log.info("We have been closed, don't request that a replica recover");
} else {
RecoveryRequest rr = new RecoveryRequest();
rr.leaderProps = leaderProps;
rr.baseUrl = ((ShardCoreRequest) srsp.getShardRequest()).baseUrl;
rr.coreName = ((ShardCoreRequest) srsp.getShardRequest()).coreName;
recoveryRequests.add(rr);
}
} else {
if (log.isInfoEnabled()) {
log.info("{}: sync completed with {}", ZkCoreNodeProps.getCoreUrl(leaderProps), srsp.getShardAddress());
}
}
}
}
private boolean handleResponse(ShardResponse srsp) {
NamedList