001/*
002 * Licensed to the Apache Software Foundation (ASF) under one
003 * or more contributor license agreements.  See the NOTICE file
004 * distributed with this work for additional information
005 * regarding copyright ownership.  The ASF licenses this file
006 * to you under the Apache License, Version 2.0 (the
007 * "License"); you may not use this file except in compliance
008 * with the License.  You may obtain a copy of the License at
009 *
010 *     http://www.apache.org/licenses/LICENSE-2.0
011 *
012 * Unless required by applicable law or agreed to in writing, software
013 * distributed under the License is distributed on an "AS IS" BASIS,
014 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
015 * See the License for the specific language governing permissions and
016 * limitations under the License.
017 */
018package org.apache.hadoop.hbase.replication.regionserver;
019
020import org.apache.yetus.audience.InterfaceAudience;
021
022/**
023 * Class that handles the recovered source of a replication stream, which is transfered from another
024 * dead region server. This will be closed when all logs are pushed to peer cluster.
025 */
026@InterfaceAudience.Private
027public class RecoveredReplicationSource extends ReplicationSource {
028
029  @Override
030  protected void startShippers() {
031    for (String walGroupId : logQueue.getQueues().keySet()) {
032      workerThreads.put(walGroupId, createNewShipper(walGroupId));
033    }
034    // start shippers after initializing the workerThreads, as in the below postFinish logic, if
035    // workerThreads is empty, we will mark the RecoveredReplicationSource as finished. So if we
036    // start the worker on the fly, it is possible that a shipper has already finished its work and
037    // called postFinish, and find out the workerThreads is empty and then mark the
038    // RecoveredReplicationSource as finish, while the next shipper has not been added to
039    // workerThreads yet. See HBASE-28155 for more details.
040    for (ReplicationSourceShipper shipper : workerThreads.values()) {
041      startShipper(shipper);
042    }
043  }
044
045  @Override
046  protected RecoveredReplicationSourceShipper createNewShipper(String walGroupId,
047    ReplicationSourceWALReader walReader) {
048    return new RecoveredReplicationSourceShipper(conf, walGroupId, this, walReader, queueStorage,
049      () -> {
050        if (workerThreads.isEmpty()) {
051          this.getSourceMetrics().clear();
052          manager.finishRecoveredSource(this);
053        }
054      });
055  }
056}