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 }