| /** |
| * 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.hdfs.qjournal.server; |
| |
| import java.io.File; |
| import java.io.IOException; |
| import java.net.InetSocketAddress; |
| import java.util.Map; |
| |
| import org.apache.commons.logging.Log; |
| import org.apache.commons.logging.LogFactory; |
| import org.apache.hadoop.classification.InterfaceAudience; |
| import org.apache.hadoop.conf.Configurable; |
| import org.apache.hadoop.conf.Configuration; |
| import org.apache.hadoop.hdfs.DFSConfigKeys; |
| import org.apache.hadoop.hdfs.HdfsConfiguration; |
| import org.apache.hadoop.hdfs.qjournal.client.QuorumJournalManager; |
| import org.apache.hadoop.hdfs.server.common.StorageErrorReporter; |
| import org.apache.hadoop.io.IOUtils; |
| import org.apache.hadoop.metrics2.lib.DefaultMetricsSystem; |
| import org.apache.hadoop.metrics2.source.JvmMetrics; |
| import org.apache.hadoop.security.SecurityUtil; |
| import org.apache.hadoop.util.StringUtils; |
| import org.apache.hadoop.util.Tool; |
| import org.apache.hadoop.util.ToolRunner; |
| |
| import com.google.common.base.Preconditions; |
| import com.google.common.collect.Maps; |
| |
| /** |
| * The JournalNode is a daemon which allows namenodes using |
| * the QuorumJournalManager to log and retrieve edits stored |
| * remotely. It is a thin wrapper around a local edit log |
| * directory with the addition of facilities to participate |
| * in the quorum protocol. |
| */ |
| @InterfaceAudience.Private |
| public class JournalNode implements Tool, Configurable { |
| public static final Log LOG = LogFactory.getLog(JournalNode.class); |
| private Configuration conf; |
| private JournalNodeRpcServer rpcServer; |
| private JournalNodeHttpServer httpServer; |
| private Map<String, Journal> journalsById = Maps.newHashMap(); |
| |
| private File localDir; |
| |
| static { |
| HdfsConfiguration.init(); |
| } |
| |
| /** |
| * When stopped, the daemon will exit with this code. |
| */ |
| private int resultCode = 0; |
| |
| synchronized Journal getOrCreateJournal(String jid) throws IOException { |
| QuorumJournalManager.checkJournalId(jid); |
| |
| Journal journal = journalsById.get(jid); |
| if (journal == null) { |
| File logDir = getLogDir(jid); |
| LOG.info("Initializing journal in directory " + logDir); |
| journal = new Journal(logDir, jid, new ErrorReporter()); |
| journalsById.put(jid, journal); |
| } |
| |
| return journal; |
| } |
| |
| |
| @Override |
| public void setConf(Configuration conf) { |
| this.conf = conf; |
| this.localDir = new File( |
| conf.get(DFSConfigKeys.DFS_JOURNALNODE_EDITS_DIR_KEY, |
| DFSConfigKeys.DFS_JOURNALNODE_EDITS_DIR_DEFAULT).trim()); |
| } |
| |
| private static void validateAndCreateJournalDir(File dir) throws IOException { |
| if (!dir.isAbsolute()) { |
| throw new IllegalArgumentException( |
| "Journal dir '" + dir + "' should be an absolute path"); |
| } |
| |
| if (!dir.exists() && !dir.mkdirs()) { |
| throw new IOException("Could not create journal dir '" + |
| dir + "'"); |
| } else if (!dir.isDirectory()) { |
| throw new IOException("Journal directory '" + dir + "' is not " + |
| "a directory"); |
| } |
| |
| if (!dir.canWrite()) { |
| throw new IOException("Unable to write to journal dir '" + |
| dir + "'"); |
| } |
| } |
| |
| |
| @Override |
| public Configuration getConf() { |
| return conf; |
| } |
| |
| @Override |
| public int run(String[] args) throws Exception { |
| start(); |
| return join(); |
| } |
| |
| /** |
| * Start listening for edits via RPC. |
| */ |
| public void start() throws IOException { |
| Preconditions.checkState(!isStarted(), "JN already running"); |
| |
| validateAndCreateJournalDir(localDir); |
| |
| DefaultMetricsSystem.initialize("JournalNode"); |
| JvmMetrics.create("JournalNode", |
| conf.get(DFSConfigKeys.DFS_METRICS_SESSION_ID_KEY), |
| DefaultMetricsSystem.instance()); |
| |
| InetSocketAddress socAddr = JournalNodeRpcServer.getAddress(conf); |
| SecurityUtil.login(conf, DFSConfigKeys.DFS_JOURNALNODE_KEYTAB_FILE_KEY, |
| DFSConfigKeys.DFS_JOURNALNODE_USER_NAME_KEY, socAddr.getHostName()); |
| |
| httpServer = new JournalNodeHttpServer(conf, this); |
| httpServer.start(); |
| |
| rpcServer = new JournalNodeRpcServer(conf, this); |
| rpcServer.start(); |
| } |
| |
| public boolean isStarted() { |
| return rpcServer != null; |
| } |
| |
| /** |
| * @return the address the IPC server is bound to |
| */ |
| public InetSocketAddress getBoundIpcAddress() { |
| return rpcServer.getAddress(); |
| } |
| |
| |
| public InetSocketAddress getBoundHttpAddress() { |
| return httpServer.getAddress(); |
| } |
| |
| |
| /** |
| * Stop the daemon with the given status code |
| * @param rc the status code with which to exit (non-zero |
| * should indicate an error) |
| */ |
| public void stop(int rc) { |
| this.resultCode = rc; |
| |
| if (rpcServer != null) { |
| rpcServer.stop(); |
| } |
| |
| if (httpServer != null) { |
| try { |
| httpServer.stop(); |
| } catch (IOException ioe) { |
| LOG.warn("Unable to stop HTTP server for " + this, ioe); |
| } |
| } |
| |
| for (Journal j : journalsById.values()) { |
| IOUtils.cleanup(LOG, j); |
| } |
| } |
| |
| /** |
| * Wait for the daemon to exit. |
| * @return the result code (non-zero if error) |
| */ |
| int join() throws InterruptedException { |
| if (rpcServer != null) { |
| rpcServer.join(); |
| } |
| return resultCode; |
| } |
| |
| public void stopAndJoin(int rc) throws InterruptedException { |
| stop(rc); |
| join(); |
| } |
| |
| /** |
| * Return the directory inside our configured storage |
| * dir which corresponds to a given journal. |
| * @param jid the journal identifier |
| * @return the file, which may or may not exist yet |
| */ |
| private File getLogDir(String jid) { |
| String dir = conf.get(DFSConfigKeys.DFS_JOURNALNODE_EDITS_DIR_KEY, |
| DFSConfigKeys.DFS_JOURNALNODE_EDITS_DIR_DEFAULT); |
| Preconditions.checkArgument(jid != null && |
| !jid.isEmpty(), |
| "bad journal identifier: %s", jid); |
| return new File(new File(dir), jid); |
| } |
| |
| |
| private class ErrorReporter implements StorageErrorReporter { |
| @Override |
| public void reportErrorOnFile(File f) { |
| LOG.fatal("Error reported on file " + f + "... exiting", |
| new Exception()); |
| stop(1); |
| } |
| } |
| |
| public static void main(String[] args) throws Exception { |
| StringUtils.startupShutdownMessage(JournalNode.class, args, LOG); |
| System.exit(ToolRunner.run(new JournalNode(), args)); |
| } |
| } |