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Apache Solr (module: core)
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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.lang.invoke.MethodHandles;

import org.apache.lucene.index.IndexCommit;
import org.apache.solr.common.SolrException;
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
   * @param switchTransactionLog if true, ReplicationHandler will rotate the transaction log once
   * the replication is done
   */
  public void startReplication(boolean switchTransactionLog) throws InterruptedException {
    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 " + cc.getLoadedCoreNames());
        }
      }
      SolrConfig.UpdateHandlerInfo uinfo = core.getSolrConfig().getUpdateHandlerInfo();
      String pollIntervalStr = "00:00:03";
      if (System.getProperty("jetty.testMode") != null) {
        pollIntervalStr = "00:00:01";
      }
      if (uinfo.autoCommmitMaxTime != -1) {
        pollIntervalStr = toPollIntervalStr(uinfo.autoCommmitMaxTime/2);
      } else if (uinfo.autoSoftCommmitMaxTime != -1) {
        pollIntervalStr = toPollIntervalStr(uinfo.autoSoftCommmitMaxTime/2);
      }
      log.info("Will start replication from leader with poll interval: {}", pollIntervalStr );

      NamedList