org.apache.solr.cloud.ReplicateFromLeader Maven / Gradle / Ivy
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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,
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* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.solr.cloud;
import java.lang.invoke.MethodHandles;
import org.apache.lucene.index.IndexCommit;
import org.apache.solr.common.SolrException;
import org.apache.solr.common.cloud.Replica;
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.SolrConfig;
import org.apache.solr.core.SolrCore;
import org.apache.solr.handler.IndexFetcher;
import org.apache.solr.handler.ReplicationHandler;
import org.apache.solr.request.LocalSolrQueryRequest;
import org.apache.solr.request.SolrQueryRequest;
import org.apache.solr.update.CommitUpdateCommand;
import org.apache.solr.update.SolrIndexWriter;
import org.apache.solr.update.UpdateLog;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
public class ReplicateFromLeader {
private static final Logger log = LoggerFactory.getLogger(MethodHandles.lookup().lookupClass());
private final CoreContainer cc;
private final String coreName;
private volatile ReplicationHandler replicationProcess;
private volatile long lastVersion = 0;
public ReplicateFromLeader(CoreContainer cc, String coreName) {
this.cc = cc;
this.coreName = coreName;
}
/**
* Start a replication handler thread that will periodically pull indices from the shard leader
*
* This is separate from the ReplicationHandler that listens at /replication, used for recovery
* and leader actions. It is simpler to discard the entire polling ReplicationHandler rather then
* worrying about disabling polling and correctly setting all of the leader bits if we need to
* reset.
*
*
TODO: It may be cleaner to extract the polling logic use that directly instead of creating
* what might be a fairly heavyweight instance here.
*
* @param switchTransactionLog if true, ReplicationHandler will rotate the transaction log once
* the replication is done
*/
public void startReplication(boolean switchTransactionLog) {
try (SolrCore core = cc.getCore(coreName)) {
if (core == null) {
if (cc.isShutDown()) {
return;
} else {
throw new SolrException(
SolrException.ErrorCode.SERVER_ERROR,
"SolrCore not found:" + coreName + " in " + CloudUtil.getLoadedCoreNamesAsString(cc));
}
}
SolrConfig.UpdateHandlerInfo uinfo = core.getSolrConfig().getUpdateHandlerInfo();
String pollIntervalStr = "00:00:03";
if (System.getProperty("jetty.testMode") != null) {
pollIntervalStr = "00:00:01";
}
String calculatedPollIntervalString = determinePollInterval(uinfo);
if (calculatedPollIntervalString != null) {
pollIntervalStr = calculatedPollIntervalString;
}
log.info("Will start replication from leader with poll interval: {}", pollIntervalStr);
NamedList