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.master.zksyncer; 019 020import java.util.Collections; 021import java.util.Set; 022import org.apache.hadoop.hbase.Server; 023import org.apache.hadoop.hbase.zookeeper.ZKWatcher; 024import org.apache.yetus.audience.InterfaceAudience; 025 026/** 027 * Tracks the active master address on server ZK cluster and synchronize them to client ZK cluster 028 * if changed 029 */ 030@InterfaceAudience.Private 031public class MasterAddressSyncer extends ClientZKSyncer { 032 private final String masterAddressZNode; 033 034 public MasterAddressSyncer(ZKWatcher watcher, ZKWatcher clientZkWatcher, Server server) { 035 super(watcher, clientZkWatcher, server); 036 masterAddressZNode = watcher.getZNodePaths().masterAddressZNode; 037 } 038 039 @Override 040 protected boolean validate(String path) { 041 return path.equals(masterAddressZNode); 042 } 043 044 @Override 045 protected Set<String> getPathsToWatch() { 046 return Collections.singleton(masterAddressZNode); 047 } 048}