| /** |
| * |
| * 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.io.IOException; |
| import java.lang.Thread.UncaughtExceptionHandler; |
| import java.util.concurrent.Executors; |
| |
| import org.apache.hadoop.hbase.classification.InterfaceAudience; |
| import org.apache.hadoop.hbase.Server; |
| |
| import com.google.common.util.concurrent.ThreadFactoryBuilder; |
| |
| /** |
| * Base class used bulk assigning and unassigning regions. |
| * Encapsulates a fixed size thread pool of executors to run assignment/unassignment. |
| * Implement {@link #populatePool(java.util.concurrent.ExecutorService)} and |
| * {@link #waitUntilDone(long)}. The default implementation of |
| * the {@link #getUncaughtExceptionHandler()} is to abort the hosting |
| * Server. |
| */ |
| @InterfaceAudience.Private |
| public abstract class BulkAssigner { |
| protected final Server server; |
| |
| /** |
| * @param server An instance of Server |
| */ |
| public BulkAssigner(final Server server) { |
| this.server = server; |
| } |
| |
| /** |
| * @return What to use for a thread prefix when executor runs. |
| */ |
| protected String getThreadNamePrefix() { |
| return this.server.getServerName() + "-" + this.getClass().getName(); |
| } |
| |
| protected UncaughtExceptionHandler getUncaughtExceptionHandler() { |
| return new UncaughtExceptionHandler() { |
| @Override |
| public void uncaughtException(Thread t, Throwable e) { |
| // Abort if exception of any kind. |
| server.abort("Uncaught exception in " + t.getName(), e); |
| } |
| }; |
| } |
| |
| protected int getThreadCount() { |
| return this.server.getConfiguration(). |
| getInt("hbase.bulk.assignment.threadpool.size", 20); |
| } |
| |
| protected long getTimeoutOnRIT() { |
| return this.server.getConfiguration(). |
| getLong("hbase.bulk.assignment.waiton.empty.rit", 5 * 60 * 1000); |
| } |
| |
| protected abstract void populatePool( |
| final java.util.concurrent.ExecutorService pool) throws IOException; |
| |
| public boolean bulkAssign() throws InterruptedException, IOException { |
| return bulkAssign(true); |
| } |
| |
| /** |
| * Run the bulk assign. |
| * |
| * @param sync |
| * Whether to assign synchronously. |
| * @throws InterruptedException |
| * @return True if done. |
| * @throws IOException |
| */ |
| public boolean bulkAssign(boolean sync) throws InterruptedException, |
| IOException { |
| boolean result = false; |
| ThreadFactoryBuilder builder = new ThreadFactoryBuilder(); |
| builder.setDaemon(true); |
| builder.setNameFormat(getThreadNamePrefix() + "-%1$d"); |
| builder.setUncaughtExceptionHandler(getUncaughtExceptionHandler()); |
| int threadCount = getThreadCount(); |
| java.util.concurrent.ExecutorService pool = |
| Executors.newFixedThreadPool(threadCount, builder.build()); |
| try { |
| populatePool(pool); |
| // How long to wait on empty regions-in-transition. If we timeout, the |
| // RIT monitor should do fixup. |
| if (sync) result = waitUntilDone(getTimeoutOnRIT()); |
| } finally { |
| // We're done with the pool. It'll exit when its done all in queue. |
| pool.shutdown(); |
| } |
| return result; |
| } |
| |
| /** |
| * Wait until bulk assign is done. |
| * @param timeout How long to wait. |
| * @throws InterruptedException |
| * @return True if the condition we were waiting on happened. |
| */ |
| protected abstract boolean waitUntilDone(final long timeout) |
| throws InterruptedException; |
| } |