| /** |
| * |
| * 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 java.io.IOException; |
| import java.io.InterruptedIOException; |
| import java.util.ArrayList; |
| import java.util.List; |
| import java.util.NavigableMap; |
| import java.util.TreeMap; |
| |
| import org.apache.commons.logging.Log; |
| import org.apache.commons.logging.LogFactory; |
| import org.apache.hadoop.hbase.Server; |
| import org.apache.hadoop.hbase.ServerName; |
| import org.apache.hadoop.hbase.classification.InterfaceAudience; |
| import org.apache.hadoop.hbase.master.ServerManager; |
| import org.apache.hadoop.hbase.protobuf.ProtobufUtil; |
| import org.apache.hadoop.hbase.protobuf.generated.HBaseProtos.RegionServerInfo; |
| import org.apache.zookeeper.KeeperException; |
| |
| /** |
| * Tracks the online region servers via ZK. |
| * |
| * <p>Handling of new RSs checking in is done via RPC. This class |
| * is only responsible for watching for expired nodes. It handles |
| * listening for changes in the RS node list and watching each node. |
| * |
| * <p>If an RS node gets deleted, this automatically handles calling of |
| * {@link ServerManager#expireServer(ServerName)} |
| */ |
| @InterfaceAudience.Private |
| public class RegionServerTracker extends ZooKeeperListener { |
| private static final Log LOG = LogFactory.getLog(RegionServerTracker.class); |
| private NavigableMap<ServerName, RegionServerInfo> regionServers = |
| new TreeMap<ServerName, RegionServerInfo>(); |
| private ServerManager serverManager; |
| private Server server; |
| |
| public RegionServerTracker(ZooKeeperWatcher watcher, |
| Server server, ServerManager serverManager) { |
| super(watcher); |
| this.server = server; |
| this.serverManager = serverManager; |
| } |
| |
| /** |
| * Starts the tracking of online RegionServers. |
| * |
| * <p>All RSs will be tracked after this method is called. |
| * |
| * @throws KeeperException |
| * @throws IOException |
| */ |
| public void start() throws KeeperException, IOException { |
| watcher.registerListener(this); |
| List<String> servers = |
| ZKUtil.listChildrenAndWatchThem(watcher, watcher.rsZNode); |
| add(servers); |
| } |
| |
| private void add(final List<String> servers) throws IOException { |
| synchronized(this.regionServers) { |
| this.regionServers.clear(); |
| for (String n: servers) { |
| ServerName sn = ServerName.parseServerName(ZKUtil.getNodeName(n)); |
| if (regionServers.get(sn) == null) { |
| RegionServerInfo.Builder rsInfoBuilder = RegionServerInfo.newBuilder(); |
| try { |
| String nodePath = ZKUtil.joinZNode(watcher.rsZNode, n); |
| byte[] data = ZKUtil.getData(watcher, nodePath); |
| if (data != null && data.length > 0 && ProtobufUtil.isPBMagicPrefix(data)) { |
| int magicLen = ProtobufUtil.lengthOfPBMagic(); |
| ProtobufUtil.mergeFrom(rsInfoBuilder, data, magicLen, data.length - magicLen); |
| } |
| if (LOG.isDebugEnabled()) { |
| LOG.debug("Added tracking of RS " + nodePath); |
| } |
| } catch (KeeperException e) { |
| LOG.warn("Get Rs info port from ephemeral node", e); |
| } catch (IOException e) { |
| LOG.warn("Illegal data from ephemeral node", e); |
| } catch (InterruptedException e) { |
| throw new InterruptedIOException(); |
| } |
| this.regionServers.put(sn, rsInfoBuilder.build()); |
| } |
| } |
| } |
| } |
| |
| private void remove(final ServerName sn) { |
| synchronized(this.regionServers) { |
| this.regionServers.remove(sn); |
| } |
| } |
| |
| @Override |
| public void nodeDeleted(String path) { |
| if (path.startsWith(watcher.rsZNode)) { |
| String serverName = ZKUtil.getNodeName(path); |
| LOG.info("RegionServer ephemeral node deleted, processing expiration [" + |
| serverName + "]"); |
| ServerName sn = ServerName.parseServerName(serverName); |
| if (!serverManager.isServerOnline(sn)) { |
| LOG.warn(serverName.toString() + " is not online or isn't known to the master."+ |
| "The latter could be caused by a DNS misconfiguration."); |
| return; |
| } |
| remove(sn); |
| this.serverManager.expireServer(sn); |
| } |
| } |
| |
| @Override |
| public void nodeChildrenChanged(String path) { |
| if (path.equals(watcher.rsZNode) |
| && !server.isAborted() && !server.isStopped()) { |
| try { |
| List<String> servers = |
| ZKUtil.listChildrenAndWatchThem(watcher, watcher.rsZNode); |
| add(servers); |
| } catch (IOException e) { |
| server.abort("Unexpected zk exception getting RS nodes", e); |
| } catch (KeeperException e) { |
| server.abort("Unexpected zk exception getting RS nodes", e); |
| } |
| } |
| } |
| |
| public RegionServerInfo getRegionServerInfo(final ServerName sn) { |
| return regionServers.get(sn); |
| } |
| |
| /** |
| * Gets the online servers. |
| * @return list of online servers |
| */ |
| public List<ServerName> getOnlineServers() { |
| synchronized (this.regionServers) { |
| return new ArrayList<ServerName>(this.regionServers.keySet()); |
| } |
| } |
| } |