Java MonitoredTask.setDescription方法代码示例

import org.apache.hadoop.hbase.monitoring.MonitoredTask; //导入方法依赖的package包/类
/**
 * Main processing loop for the HMaster.
 * <ol>
 * <li>Block until becoming active master
 * <li>Finish initialization via finishInitialization(MonitoredTask)
 * <li>Enter loop until we are stopped
 * <li>Stop services and perform cleanup once stopped
 * </ol>
 */
@Override
public void run() {
  MonitoredTask startupStatus =
    TaskMonitor.get().createStatus("Master startup");
  startupStatus.setDescription("Master startup");
  masterStartTime = System.currentTimeMillis();
  try {
    this.registeredZKListenersBeforeRecovery = this.zooKeeper.getListeners();

    // Put up info server.
    int port = this.conf.getInt("hbase.master.info.port", 60010);
    if (port >= 0) {
      String a = this.conf.get("hbase.master.info.bindAddress", "0.0.0.0");
      this.infoServer = new InfoServer(MASTER, a, port, false, this.conf);
      this.infoServer.addServlet("status", "/master-status", MasterStatusServlet.class);
      this.infoServer.addServlet("dump", "/dump", MasterDumpServlet.class);
      this.infoServer.setAttribute(MASTER, this);
      this.infoServer.start();
    }

    /*
     * Block on becoming the active master.
     *
     * We race with other masters to write our address into ZooKeeper.  If we
     * succeed, we are the primary/active master and finish initialization.
     *
     * If we do not succeed, there is another active master and we should
     * now wait until it dies to try and become the next active master.  If we
     * do not succeed on our first attempt, this is no longer a cluster startup.
     */
    becomeActiveMaster(startupStatus);

    // We are either the active master or we were asked to shutdown
    if (!this.stopped) {
      finishInitialization(startupStatus, false);
      loop();
    }
  } catch (Throwable t) {
    // HBASE-5680: Likely hadoop23 vs hadoop 20.x/1.x incompatibility
    if (t instanceof NoClassDefFoundError &&
        t.getMessage().contains("org/apache/hadoop/hdfs/protocol/FSConstants$SafeModeAction")) {
        // improved error message for this special case
        abort("HBase is having a problem with its Hadoop jars.  You may need to "
            + "recompile HBase against Hadoop version "
            +  org.apache.hadoop.util.VersionInfo.getVersion()
            + " or change your hadoop jars to start properly", t);
    } else {
      abort("Unhandled exception. Starting shutdown.", t);
    }
  } finally {
    startupStatus.cleanup();

    stopChores();
    // Wait for all the remaining region servers to report in IFF we were
    // running a cluster shutdown AND we were NOT aborting.
    if (!this.abort && this.serverManager != null &&
        this.serverManager.isClusterShutdown()) {
      this.serverManager.letRegionServersShutdown();
    }
    stopServiceThreads();
    // Stop services started for both backup and active masters
    if (this.activeMasterManager != null) this.activeMasterManager.stop();
    if (this.catalogTracker != null) this.catalogTracker.stop();
    if (this.serverManager != null) this.serverManager.stop();
    if (this.assignmentManager != null) this.assignmentManager.stop();
    if (this.fileSystemManager != null) this.fileSystemManager.stop();
    if (this.snapshotManager != null) this.snapshotManager.stop("server shutting down.");
    this.zooKeeper.close();
  }
  LOG.info("HMaster main thread exiting");
}
 

import org.apache.hadoop.hbase.monitoring.MonitoredTask; //导入方法依赖的package包/类
private void startActiveMasterManager(int infoPort) throws KeeperException {
  String backupZNode = ZNodePaths.joinZNode(
    zooKeeper.znodePaths.backupMasterAddressesZNode, serverName.toString());
  /*
  * Add a ZNode for ourselves in the backup master directory since we
  * may not become the active master. If so, we want the actual active
  * master to know we are backup masters, so that it won't assign
  * regions to us if so configured.
  *
  * If we become the active master later, ActiveMasterManager will delete
  * this node explicitly.  If we crash before then, ZooKeeper will delete
  * this node for us since it is ephemeral.
  */
  LOG.info("Adding backup master ZNode " + backupZNode);
  if (!MasterAddressTracker.setMasterAddress(zooKeeper, backupZNode, serverName, infoPort)) {
    LOG.warn("Failed create of " + backupZNode + " by " + serverName);
  }
  this.activeMasterManager.setInfoPort(infoPort);
  int timeout = conf.getInt(HConstants.ZK_SESSION_TIMEOUT, HConstants.DEFAULT_ZK_SESSION_TIMEOUT);
  // If we're a backup master, stall until a primary to write this address
  if (conf.getBoolean(HConstants.MASTER_TYPE_BACKUP, HConstants.DEFAULT_MASTER_TYPE_BACKUP)) {
    LOG.debug("HMaster started in backup mode. Stalling until master znode is written.");
    // This will only be a minute or so while the cluster starts up,
    // so don't worry about setting watches on the parent znode
    while (!activeMasterManager.hasActiveMaster()) {
      LOG.debug("Waiting for master address and cluster state znode to be written.");
      Threads.sleep(timeout);
    }
  }
  MonitoredTask status = TaskMonitor.get().createStatus("Master startup");
  status.setDescription("Master startup");
  try {
    if (activeMasterManager.blockUntilBecomingActiveMaster(timeout, status)) {
      finishActiveMasterInitialization(status);
    }
  } catch (Throwable t) {
    status.setStatus("Failed to become active: " + t.getMessage());
    LOG.error(HBaseMarkers.FATAL, "Failed to become active master", t);
    // HBASE-5680: Likely hadoop23 vs hadoop 20.x/1.x incompatibility
    if (t instanceof NoClassDefFoundError && t.getMessage().
        contains("org/apache/hadoop/hdfs/protocol/HdfsConstants$SafeModeAction")) {
      // improved error message for this special case
      abort("HBase is having a problem with its Hadoop jars.  You may need to recompile " +
        "HBase against Hadoop version " + org.apache.hadoop.util.VersionInfo.getVersion() +
        " or change your hadoop jars to start properly", t);
    } else {
      abort("Unhandled exception. Starting shutdown.", t);
    }
  } finally {
    status.cleanup();
  }
}
 

import org.apache.hadoop.hbase.monitoring.MonitoredTask; //导入方法依赖的package包/类
/**
 * Main processing loop for the HMaster.
 * <ol>
 * <li>Block until becoming active master
 * <li>Finish initialization via finishInitialization(MonitoredTask)
 * <li>Enter loop until we are stopped
 * <li>Stop services and perform cleanup once stopped
 * </ol>
 */
@Override
public void run() {
  MonitoredTask startupStatus =
    TaskMonitor.get().createStatus("Master startup");
  startupStatus.setDescription("Master startup");
  masterStartTime = System.currentTimeMillis();
  try {
    /*
     * Block on becoming the active master.
     *
     * We race with other masters to write our address into ZooKeeper.  If we
     * succeed, we are the primary/active master and finish initialization.
     *
     * If we do not succeed, there is another active master and we should
     * now wait until it dies to try and become the next active master.  If we
     * do not succeed on our first attempt, this is no longer a cluster startup.
     */
    becomeActiveMaster(startupStatus);

    // We are either the active master or we were asked to shutdown
    if (!this.stopped) {
      finishInitialization(startupStatus);
      loop();
    }
  } catch (Throwable t) {
    abort("Unhandled exception. Starting shutdown.", t);
  } finally {
    startupStatus.cleanup();
    
    stopChores();
    // Wait for all the remaining region servers to report in IFF we were
    // running a cluster shutdown AND we were NOT aborting.
    if (!this.abort && this.serverManager != null &&
        this.serverManager.isClusterShutdown()) {
      this.serverManager.letRegionServersShutdown();
    }
    stopServiceThreads();
    // Stop services started for both backup and active masters
    if (this.activeMasterManager != null) this.activeMasterManager.stop();
    if (this.catalogTracker != null) this.catalogTracker.stop();
    if (this.serverManager != null) this.serverManager.stop();
    if (this.assignmentManager != null) this.assignmentManager.stop();
    if (this.fileSystemManager != null) this.fileSystemManager.stop();
    this.zooKeeper.close();
  }
  LOG.info("HMaster main thread exiting");
}