1 /** 2 * 3 * Licensed to the Apache Software Foundation (ASF) under one 4 * or more contributor license agreements. See the NOTICE file 5 * distributed with this work for additional information 6 * regarding copyright ownership. The ASF licenses this file 7 * to you under the Apache License, Version 2.0 (the 8 * "License"); you may not use this file except in compliance 9 * with the License. You may obtain a copy of the License at 10 * 11 * http://www.apache.org/licenses/LICENSE-2.0 12 * 13 * Unless required by applicable law or agreed to in writing, software 14 * distributed under the License is distributed on an "AS IS" BASIS, 15 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 16 * See the License for the specific language governing permissions and 17 * limitations under the License. 18 */ 19 package org.apache.hadoop.hbase.zookeeper; 20 21 import org.apache.hadoop.classification.InterfaceAudience; 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 @InterfaceAudience.Private 33 public class MetaNodeTracker extends ZooKeeperNodeTracker { 34 /** 35 * Creates a meta node tracker. 36 * @param watcher 37 * @param abortable 38 */ 39 public MetaNodeTracker(final ZooKeeperWatcher watcher, final Abortable abortable) { 40 super(watcher, ZKUtil.joinZNode(watcher.assignmentZNode, 41 HRegionInfo.FIRST_META_REGIONINFO.getEncodedName()), abortable); 42 } 43 44 @Override 45 public void nodeDeleted(String path) { 46 super.nodeDeleted(path); 47 } 48 }