content: /*
   * The Alluxio Open Foundation licenses this work under the Apache License, version 2.0
   * (the "License"). You may not use this work except in compliance with the License, which is
   * available at www.apache.org/licenses/LICENSE-2.0
   *
   * This software is distributed on an "AS IS" basis, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND,
   * either express or implied, as more fully set forth in the License.
   *
   * See the NOTICE file distributed with this work for information regarding copyright ownership.
   */
  
  package alluxio.master;
  
  import alluxio.Process;
  import alluxio.ProcessUtils;
  import alluxio.RuntimeConstants;
  import alluxio.conf.Configuration;
  import alluxio.conf.PropertyKey;
  import alluxio.master.journal.JournalSystem;
  import alluxio.master.journal.JournalUtils;
  import alluxio.underfs.MasterUfsManager;
  import alluxio.util.CommonUtils;
  import alluxio.util.CommonUtils.ProcessType;
  import alluxio.util.WaitForOptions;
  
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  import java.util.concurrent.CountDownLatch;
  import java.util.concurrent.TimeoutException;
  import javax.annotation.concurrent.NotThreadSafe;
  
  /**
   * The secondary Alluxio master that replays journal logs and writes checkpoints.
   */
  @NotThreadSafe
  public final class AlluxioSecondaryMaster implements Process {
    private static final Logger LOG = LoggerFactory.getLogger(AlluxioSecondaryMaster.class);
    private final MasterRegistry mRegistry = new MasterRegistry();
    private final JournalSystem mJournalSystem = new JournalSystem.Builder()
        .setLocation(JournalUtils.getJournalLocation()).build(ProcessType.MASTER);
    private final CountDownLatch mLatch = new CountDownLatch(1);
  
    private volatile boolean mRunning = false;
  
    /**
     * Creates a {@link AlluxioSecondaryMaster}.
     */
    AlluxioSecondaryMaster() {
      String baseDir = Configuration.getString(PropertyKey.SECONDARY_MASTER_METASTORE_DIR);
      // Create masters.
      MasterUtils.createMasters(mRegistry, CoreMasterContext.newBuilder()
          .setJournalSystem(mJournalSystem)
          .setPrimarySelector(new AlwaysStandbyPrimarySelector())
          .setSafeModeManager(new DefaultSafeModeManager())
          .setBackupManager(new BackupManager(mRegistry))
          .setBlockStoreFactory(MasterUtils.getBlockStoreFactory(baseDir))
          .setInodeStoreFactory(MasterUtils.getInodeStoreFactory(baseDir))
          .setStartTimeMs(System.currentTimeMillis())
          .setPort(Configuration.getInt(PropertyKey.MASTER_RPC_PORT))
          .setUfsManager(new MasterUfsManager())
          .build());
      // Check that journals of each service have been formatted.
      if (!mJournalSystem.isFormatted()) {
        throw new RuntimeException(
            String.format("Journal %s has not been formatted!", JournalUtils.getJournalLocation()));
      }
    }
  
    @Override
    public void start() throws Exception {
      mJournalSystem.start();
      mRunning = true;
      mLatch.await();
      mJournalSystem.stop();
      mRegistry.close();
      mRunning = false;
    }
  
    @Override
    public void stop() throws Exception {
      mLatch.countDown();
    }
  
    @Override
    public boolean waitForReady(int timeoutMs) {
      try {
        CommonUtils.waitFor("Secondary master to start", () -> mRunning,
            WaitForOptions.defaults().setTimeoutMs(timeoutMs));
        return true;
      } catch (InterruptedException e) {
        Thread.currentThread().interrupt();
        return false;
      } catch (TimeoutException e) {
        return false;
      }
    }
  
    @Override
    public String toString() {
      return "Alluxio secondary master";
    }
  
    /**
     * Starts the secondary Alluxio master.
     *
     * @param args command line arguments, should be empty
     */
    // TODO(peis): Move the non-static methods into AlluxioSecondaryMasterProcess for consistency.
    public static void main(String[] args) {
      if (args.length != 0) {
        LOG.info("java -cp {} {}", RuntimeConstants.ALLUXIO_JAR,
            AlluxioSecondaryMaster.class.getCanonicalName());
        System.exit(-1);
      }
  
      AlluxioSecondaryMaster master = new AlluxioSecondaryMaster();
      ProcessUtils.run(master);
    }
  }
  