Exemple #1
0
  /** Start the JobTracker process, listen on the indicated port */
  JobTracker(Configuration conf) throws IOException {
    //
    // Grab some static constants
    //
    maxCurrentTasks = conf.getInt("mapred.tasktracker.tasks.maximum", 2);
    RETIRE_JOB_INTERVAL = conf.getLong("mapred.jobtracker.retirejob.interval", 24 * 60 * 60 * 1000);
    RETIRE_JOB_CHECK_INTERVAL = conf.getLong("mapred.jobtracker.retirejob.check", 60 * 1000);
    TASK_ALLOC_EPSILON = conf.getFloat("mapred.jobtracker.taskalloc.loadbalance.epsilon", 0.2f);
    PAD_FRACTION = conf.getFloat("mapred.jobtracker.taskalloc.capacitypad", 0.1f);
    MIN_SLOTS_FOR_PADDING = 3 * maxCurrentTasks;

    // This is a directory of temporary submission files.  We delete it
    // on startup, and can delete any files that we're done with
    this.conf = conf;
    JobConf jobConf = new JobConf(conf);
    this.systemDir = jobConf.getSystemDir();
    this.fs = FileSystem.get(conf);
    FileUtil.fullyDelete(fs, systemDir);
    fs.mkdirs(systemDir);

    // Same with 'localDir' except it's always on the local disk.
    jobConf.deleteLocalFiles(SUBDIR);

    // Set ports, start RPC servers, etc.
    InetSocketAddress addr = getAddress(conf);
    this.localMachine = addr.getHostName();
    this.port = addr.getPort();
    this.interTrackerServer = RPC.getServer(this, addr.getPort(), 10, false, conf);
    this.interTrackerServer.start();
    Properties p = System.getProperties();
    for (Iterator it = p.keySet().iterator(); it.hasNext(); ) {
      String key = (String) it.next();
      String val = (String) p.getProperty(key);
      LOG.info("Property '" + key + "' is " + val);
    }

    this.infoPort = conf.getInt("mapred.job.tracker.info.port", 50030);
    this.infoServer = new JobTrackerInfoServer(this, infoPort);
    this.infoServer.start();

    this.startTime = System.currentTimeMillis();

    new Thread(this.expireTrackers).start();
    new Thread(this.retireJobs).start();
    new Thread(this.initJobs).start();
  }
    FSVolume(File currentDir, Configuration conf) throws IOException {
      this.reserved = conf.getLong("dfs.datanode.du.reserved", 0);
      boolean supportAppends = conf.getBoolean("dfs.support.append", false);
      File parent = currentDir.getParentFile();

      this.detachDir = new File(parent, "detach");
      if (detachDir.exists()) {
        recoverDetachedBlocks(currentDir, detachDir);
      }

      // Files that were being written when the datanode was last shutdown
      // are now moved back to the data directory. It is possible that
      // in the future, we might want to do some sort of datanode-local
      // recovery for these blocks. For example, crc validation.
      //
      this.tmpDir = new File(parent, "tmp");
      if (tmpDir.exists()) {
        if (supportAppends) {
          recoverDetachedBlocks(currentDir, tmpDir);
        } else {
          FileUtil.fullyDelete(tmpDir);
        }
      }
      this.dataDir = new FSDir(currentDir);
      if (!tmpDir.mkdirs()) {
        if (!tmpDir.isDirectory()) {
          throw new IOException("Mkdirs failed to create " + tmpDir.toString());
        }
      }
      if (!detachDir.mkdirs()) {
        if (!detachDir.isDirectory()) {
          throw new IOException("Mkdirs failed to create " + detachDir.toString());
        }
      }
      this.usage = new DF(parent, conf);
      this.dfsUsage = new DU(parent, conf);
      this.dfsUsage.start();
    }
  /**
   * Get the locally cached file or archive; it could either be previously cached (and valid) or
   * copy it from the {@link FileSystem} now.
   *
   * @param cache the cache to be localized, this should be specified as new
   *     URI(hdfs://hostname:port/absolute_path_to_file#LINKNAME). If no schema or hostname:port is
   *     provided the file is assumed to be in the filesystem being used in the Configuration
   * @param conf The Confguration file which contains the filesystem
   * @param subDir The sub cache Dir where you want to localize the files/archives
   * @param fileStatus The file status on the dfs.
   * @param isArchive if the cache is an archive or a file. In case it is an archive with a .zip or
   *     .jar or .tar or .tgz or .tar.gz extension it will be unzipped/unjarred/untarred
   *     automatically and the directory where the archive is unzipped/unjarred/untarred is returned
   *     as the Path. In case of a file, the path to the file is returned
   * @param confFileStamp this is the hdfs file modification timestamp to verify that the file to be
   *     cached hasn't changed since the job started
   * @param fileLength this is the length of the cache file
   * @param currentWorkDir this is the directory where you would want to create symlinks for the
   *     locally cached files/archives
   * @param honorSymLinkConf if this is false, then the symlinks are not created even if conf says
   *     so (this is required for an optimization in task launches
   * @param lDirAllocator LocalDirAllocator of the tracker
   * @return the path to directory where the archives are unjarred in case of archives, the path to
   *     the file where the file is copied locally
   * @throws IOException
   */
  private static Path getLocalCache(
      URI cache,
      Configuration conf,
      Path subDir,
      FileStatus fileStatus,
      boolean isArchive,
      long confFileStamp,
      long fileLength,
      Path currentWorkDir,
      boolean honorSymLinkConf,
      MRAsyncDiskService asyncDiskService,
      LocalDirAllocator lDirAllocator)
      throws IOException {
    String key = getKey(cache, conf, confFileStamp);

    CacheStatus lcacheStatus;
    Path localizedPath;
    synchronized (cachedArchives) {
      lcacheStatus = cachedArchives.get(key);
      if (lcacheStatus == null) {
        // was never localized
        Path uniqueParentDir = new Path(subDir, String.valueOf(random.nextLong()));
        String cachePath = new Path(uniqueParentDir, makeRelative(cache, conf)).toString();
        Path localPath = lDirAllocator.getLocalPathForWrite(cachePath, fileLength, conf);
        lcacheStatus =
            new CacheStatus(
                new Path(localPath.toString().replace(cachePath, "")), localPath, uniqueParentDir);
        cachedArchives.put(key, lcacheStatus);
      }
      lcacheStatus.refcount++;
    }
    boolean initSuccessful = false;
    try {
      synchronized (lcacheStatus) {
        if (!lcacheStatus.isInited()) {
          localizedPath = localizeCache(conf, cache, confFileStamp, lcacheStatus, isArchive);
          lcacheStatus.initComplete();
        } else {
          if (fileStatus != null) {
            localizedPath =
                checkCacheStatusValidity(
                    conf, cache, confFileStamp, lcacheStatus, fileStatus, isArchive);
          } else {
            // if fileStatus is null, then the md5 must be correct
            // so there is no need to check for cache validity
            localizedPath = lcacheStatus.localizedLoadPath;
          }
        }
        createSymlink(conf, cache, lcacheStatus, isArchive, currentWorkDir, honorSymLinkConf);
      }

      // try deleting stuff if you can
      long size = 0;
      int numberSubDir = 0;
      synchronized (lcacheStatus) {
        synchronized (baseDirSize) {
          Long get = baseDirSize.get(lcacheStatus.getBaseDir());
          if (get != null) {
            size = get.longValue();
          } else {
            LOG.warn("Cannot find size of baseDir: " + lcacheStatus.getBaseDir());
          }
        }
        synchronized (baseDirNumberSubDir) {
          Integer get = baseDirNumberSubDir.get(lcacheStatus.getBaseDir());
          if (get != null) {
            numberSubDir = get.intValue();
          } else {
            LOG.warn("Cannot find subdirectories limit of baseDir: " + lcacheStatus.getBaseDir());
          }
        }
      }
      // setting the cache size to a default of 10GB
      long allowedSize = conf.getLong("local.cache.size", DEFAULT_CACHE_SIZE);
      long allowedNumberSubDir =
          conf.getLong("local.cache.numbersubdir", DEFAULT_CACHE_SUBDIR_LIMIT);
      if (allowedSize < size || allowedNumberSubDir < numberSubDir) {
        // try some cache deletions
        LOG.debug(
            "Start deleting released cache because"
                + " [size, allowedSize, numberSubDir, allowedNumberSubDir] ="
                + " ["
                + size
                + ", "
                + allowedSize
                + ", "
                + numberSubDir
                + ", "
                + allowedNumberSubDir
                + "]");
        deleteCache(conf, asyncDiskService);
      }
      initSuccessful = true;
      return localizedPath;
    } finally {
      if (!initSuccessful) {
        synchronized (cachedArchives) {
          lcacheStatus.refcount--;
        }
      }
    }
  }