| /** |
| * |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance |
| * with the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| package org.apache.hadoop.hbase.zookeeper; |
| |
| import org.apache.commons.logging.Log; |
| import org.apache.commons.logging.LogFactory; |
| import org.apache.hadoop.hbase.classification.InterfaceAudience; |
| import org.apache.hadoop.hbase.regionserver.HRegionServer; |
| import org.apache.hadoop.hbase.regionserver.handler.FinishRegionRecoveringHandler; |
| import org.apache.zookeeper.KeeperException; |
| |
| /** |
| * Watcher used to be notified of the recovering region coming out of recovering state |
| */ |
| @InterfaceAudience.Private |
| public class RecoveringRegionWatcher extends ZooKeeperListener { |
| private static final Log LOG = LogFactory.getLog(RecoveringRegionWatcher.class); |
| |
| private HRegionServer server; |
| |
| /** |
| * Construct a ZooKeeper event listener. |
| */ |
| public RecoveringRegionWatcher(ZooKeeperWatcher watcher, HRegionServer server) { |
| super(watcher); |
| watcher.registerListener(this); |
| this.server = server; |
| } |
| |
| /** |
| * Called when a node has been deleted |
| * @param path full path of the deleted node |
| */ |
| @Override |
| public void nodeDeleted(String path) { |
| if (this.server.isStopped() || this.server.isStopping()) { |
| return; |
| } |
| |
| String parentPath = path.substring(0, path.lastIndexOf('/')); |
| if (!this.watcher.recoveringRegionsZNode.equalsIgnoreCase(parentPath)) { |
| return; |
| } |
| |
| String regionName = path.substring(parentPath.length() + 1); |
| |
| server.getExecutorService().submit(new FinishRegionRecoveringHandler(server, regionName, path)); |
| } |
| |
| @Override |
| public void nodeDataChanged(String path) { |
| registerWatcher(path); |
| } |
| |
| @Override |
| public void nodeChildrenChanged(String path) { |
| registerWatcher(path); |
| } |
| |
| /** |
| * Reinstall watcher because watcher only fire once though we're only interested in nodeDeleted |
| * event we need to register the watcher in case other event happens |
| */ |
| private void registerWatcher(String path) { |
| String parentPath = path.substring(0, path.lastIndexOf('/')); |
| if (!this.watcher.recoveringRegionsZNode.equalsIgnoreCase(parentPath)) { |
| return; |
| } |
| |
| try { |
| ZKUtil.getDataAndWatch(watcher, path); |
| } catch (KeeperException e) { |
| LOG.warn("Can't register watcher on znode " + path, e); |
| } |
| } |
| } |