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.Collections; 022import java.util.Set; 023import org.apache.hadoop.hbase.Server; 024import org.apache.hadoop.hbase.zookeeper.ZKWatcher; 025import org.apache.yetus.audience.InterfaceAudience; 026 027/** 028 * Tracks the active master address on server ZK cluster and synchronize them to client ZK cluster 029 * if changed 030 */ 031@InterfaceAudience.Private 032public class MasterAddressSyncer extends ClientZKSyncer { 033 private final String masterAddressZNode; 034 035 public MasterAddressSyncer(ZKWatcher watcher, ZKWatcher clientZkWatcher, Server server) { 036 super(watcher, clientZkWatcher, server); 037 masterAddressZNode = watcher.getZNodePaths().masterAddressZNode; 038 } 039 040 @Override 041 protected boolean validate(String path) { 042 return path.equals(masterAddressZNode); 043 } 044 045 @Override 046 protected Set<String> getPathsToWatch() { 047 return Collections.singleton(masterAddressZNode); 048 } 049}