1 /** 2 * Copyright 2010 The Apache Software Foundation 3 * 4 * Licensed to the Apache Software Foundation (ASF) under one 5 * or more contributor license agreements. See the NOTICE file 6 * distributed with this work for additional information 7 * regarding copyright ownership. The ASF licenses this file 8 * to you under the Apache License, Version 2.0 (the 9 * "License"); you may not use this file except in compliance 10 * with the License. You may obtain a copy of the License at 11 * 12 * http://www.apache.org/licenses/LICENSE-2.0 13 * 14 * Unless required by applicable law or agreed to in writing, software 15 * distributed under the License is distributed on an "AS IS" BASIS, 16 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 17 * See the License for the specific language governing permissions and 18 * limitations under the License. 19 */ 20 package org.apache.hadoop.hbase.zookeeper; 21 22 import org.apache.hadoop.hbase.Abortable; 23 import org.apache.hadoop.hbase.HRegionInfo; 24 25 /** 26 * Tracks the unassigned zookeeper node used by the META table. 27 * <p> 28 * If META is already assigned when instantiating this class, you will not 29 * receive any notification for that assignment. You will receive a 30 * notification after META has been successfully assigned to a new location. 31 */ 32 public class MetaNodeTracker extends ZooKeeperNodeTracker { 33 /** 34 * Creates a meta node tracker. 35 * @param watcher 36 * @param abortable 37 */ 38 public MetaNodeTracker(final ZooKeeperWatcher watcher, final Abortable abortable) { 39 super(watcher, ZKUtil.joinZNode(watcher.assignmentZNode, 40 HRegionInfo.FIRST_META_REGIONINFO.getEncodedName()), abortable); 41 } 42 43 @Override 44 public void nodeDeleted(String path) { 45 super.nodeDeleted(path); 46 } 47 }