| /* |
| * 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.master; |
| |
| import java.util.concurrent.TimeUnit; |
| import org.apache.hadoop.hbase.util.Threads; |
| import org.apache.yetus.audience.InterfaceAudience; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| /** |
| * Protection against zombie master. Started once Master accepts active responsibility and starts |
| * taking over responsibilities. Allows a finite time window before giving up ownership. |
| */ |
| @InterfaceAudience.Private |
| class MasterInitializationMonitor extends Thread { |
| |
| private static final Logger LOG = LoggerFactory.getLogger(MasterInitializationMonitor.class); |
| |
| /** The amount of time in milliseconds to sleep before checking initialization status. */ |
| public static final String TIMEOUT_KEY = "hbase.master.initializationmonitor.timeout"; |
| public static final long TIMEOUT_DEFAULT = TimeUnit.MILLISECONDS.convert(15, TimeUnit.MINUTES); |
| |
| /** |
| * When timeout expired and initialization has not complete, call {@link System#exit(int)} when |
| * true, do nothing otherwise. |
| */ |
| public static final String HALT_KEY = "hbase.master.initializationmonitor.haltontimeout"; |
| public static final boolean HALT_DEFAULT = false; |
| |
| private final HMaster master; |
| private final long timeout; |
| private final boolean haltOnTimeout; |
| |
| /** Creates a Thread that monitors the {@link #isInitialized()} state. */ |
| MasterInitializationMonitor(HMaster master) { |
| super("MasterInitializationMonitor"); |
| this.master = master; |
| this.timeout = master.getConfiguration().getLong(TIMEOUT_KEY, TIMEOUT_DEFAULT); |
| this.haltOnTimeout = master.getConfiguration().getBoolean(HALT_KEY, HALT_DEFAULT); |
| this.setDaemon(true); |
| } |
| |
| @Override |
| public void run() { |
| try { |
| while (!master.isStopped() && master.isActiveMaster()) { |
| Thread.sleep(timeout); |
| if (master.isInitialized()) { |
| LOG.debug("Initialization completed within allotted tolerance. Monitor exiting."); |
| } else { |
| LOG.error("Master failed to complete initialization after " + timeout + "ms. Please" + |
| " consider submitting a bug report including a thread dump of this process."); |
| if (haltOnTimeout) { |
| LOG.error("Zombie Master exiting. Thread dump to stdout"); |
| Threads.printThreadInfo(System.out, "Zombie HMaster"); |
| System.exit(-1); |
| } |
| } |
| } |
| } catch (InterruptedException ie) { |
| LOG.trace("InitMonitor thread interrupted. Existing."); |
| } |
| } |
| } |