001/* 002 * 003 * Licensed to the Apache Software Foundation (ASF) under one 004 * or more contributor license agreements. See the NOTICE file 005 * distributed with this work for additional information 006 * regarding copyright ownership. The ASF licenses this file 007 * to you under the Apache License, Version 2.0 (the 008 * "License"); you may not use this file except in compliance 009 * with the License. You may obtain a copy of the License at 010 * 011 * http://www.apache.org/licenses/LICENSE-2.0 012 * 013 * Unless required by applicable law or agreed to in writing, software 014 * distributed under the License is distributed on an "AS IS" BASIS, 015 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 016 * See the License for the specific language governing permissions and 017 * limitations under the License. 018 */ 019package org.apache.hadoop.hbase.master.zksyncer; 020 021import java.util.Set; 022import java.util.stream.Collectors; 023import java.util.stream.IntStream; 024import org.apache.hadoop.hbase.Server; 025import org.apache.hadoop.hbase.zookeeper.ZKWatcher; 026import org.apache.yetus.audience.InterfaceAudience; 027 028/** 029 * Tracks the meta region locations on server ZK cluster and synchronize them to client ZK cluster 030 * if changed 031 */ 032@InterfaceAudience.Private 033public class MetaLocationSyncer extends ClientZKSyncer { 034 035 private volatile int metaReplicaCount = 1; 036 037 public MetaLocationSyncer(ZKWatcher watcher, ZKWatcher clientZkWatcher, Server server) { 038 super(watcher, clientZkWatcher, server); 039 } 040 041 @Override 042 protected boolean validate(String path) { 043 return watcher.getZNodePaths().isMetaZNodePath(path); 044 } 045 046 @Override 047 protected Set<String> getPathsToWatch() { 048 return IntStream.range(0, metaReplicaCount) 049 .mapToObj(watcher.getZNodePaths()::getZNodeForReplica).collect(Collectors.toSet()); 050 } 051 052 public void setMetaReplicaCount(int replicaCount) { 053 if (replicaCount != metaReplicaCount) { 054 metaReplicaCount = replicaCount; 055 refreshWatchingList(); 056 } 057 } 058}