Examples of org.apache.hadoop.fs.LocalDirAllocator$AllocatorPerContext$PathIterator

org.apache.hadoop.fs.LocalDirAllocator
An implementation of a round-robin scheme for disk allocation for creating files. The way it works is that it is kept track what disk was last allocated for a file write. For the current request, the next disk from the set of disks would be allocated if the free space on the disk is sufficient enough to accommodate the file that is being considered for creation. If the space requirements cannot be met, the next disk in order would be tried and so on till a disk is found with sufficient capacity. Once a disk with sufficient space is identified, a check is done to make sure that the disk is writable. Also, there is an API provided that doesn't take the space requirements into consideration but just checks whether the disk under consideration is writable (this should be used for cases where the file size is not known apriori). An API is provided to read a path that was created earlier. That API works by doing a scan of all the disks for the input pathname. This implementation also provides the functionality of having multiple allocators per JVM (one for each unique functionality or context, like mapred, dfs-client, etc.). It ensures that there is only one instance of an allocator per context per JVM. Note: 1. The contexts referred above are actually the configuration items defined in the Configuration class like "mapred.local.dir" (for which we want to control the dir allocations). The context-strings are exactly those configuration items. 2. This implementation does not take into consideration cases where a disk becomes read-only or goes out of space while a file is being written to (disks are shared between multiple processes, and so the latter situation is probable). 3. In the class implementation, "Disk" is referred to as "Dir", which actually points to the configured directory on the Disk which will be the parent for all file write/read allocations.

    boolean isMap = conf.getBoolean("mapred.task.is.map", true);
    int partition = conf.getInt("mapred.task.partition", 0);
    
    // setup the local and user working directories
    FileSystem local = FileSystem.getLocal(conf);
    LocalDirAllocator lDirAlloc = new LocalDirAllocator("mapred.local.dir");
    File workDirName = new File(lDirAlloc.getLocalPathToRead(
                                  TaskTracker.getJobCacheSubdir() 
                                  + Path.SEPARATOR + taskId.getJobID() 
                                  + Path.SEPARATOR + taskId
                                  + Path.SEPARATOR + "work",
                                  conf). toString());

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      this.conf = (JobConf) conf;
    } else {
      this.conf = new JobConf(conf);
    }
    this.mapOutputFile.setConf(this.conf);
    this.lDirAlloc = new LocalDirAllocator("mapred.local.dir");
    // add the static resolutions (this is required for the junit to
    // work on testcases that simulate multiple nodes on a single physical
    // node.
    String hostToResolved[] = conf.getStrings("hadoop.net.static.resolutions");
    if (hostToResolved != null) {

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    String localDir = conf.get("mapred.temp.dir");
    if (localDir == null) {
      localDir = conf.get("hadoop.tmp.dir");
      conf.set("mapred.temp.dir", localDir);
    }
    dir = new LocalDirAllocator("mapred.temp.dir");


    System.setProperty("test.build.data", localDir);
    System.out.println("Local = " + localDir);
    ChecksumFileSystem checkedLocal = FileSystem.getLocal(conf);
    FileSystem rawLocal = checkedLocal.getRawFileSystem();

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    System.out.println("SEED: " + sharedSeed);


    Map<LocalResource,Future<Path>> pending =
      new HashMap<LocalResource,Future<Path>>();
    ExecutorService exec = Executors.newSingleThreadExecutor();
    LocalDirAllocator dirs =
      new LocalDirAllocator(TestFSDownload.class.getName());
    int size = 512;
    LocalResourceVisibility vis = LocalResourceVisibility.PUBLIC;
    Path path = new Path(basedir, "test-file");
    LocalResource rsrc = createFile(files, path, size, rand, vis);
    rsrcVis.put(rsrc, vis);
    Path destPath = dirs.getLocalPathForWrite(
        basedir.toString(), size, conf);
    destPath = new Path (destPath,
      Long.toString(uniqueNumberGenerator.incrementAndGet()));
    FSDownload fsd =
      new FSDownload(files, UserGroupInformation.getCurrentUser(), conf,

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    System.out.println("SEED: " + sharedSeed);


    Map<LocalResource,Future<Path>> pending =
      new HashMap<LocalResource,Future<Path>>();
    ExecutorService exec = Executors.newSingleThreadExecutor();
    LocalDirAllocator dirs =
      new LocalDirAllocator(TestFSDownload.class.getName());
    int[] sizes = new int[10];
    for (int i = 0; i < 10; ++i) {
      sizes[i] = rand.nextInt(512) + 512;
      LocalResourceVisibility vis = LocalResourceVisibility.PRIVATE;
      if (i%2 == 1) {
        vis = LocalResourceVisibility.APPLICATION;
      }
      Path p = new Path(basedir, "" + i);
      LocalResource rsrc = createFile(files, p, sizes[i], rand, vis);
      rsrcVis.put(rsrc, vis);
      Path destPath = dirs.getLocalPathForWrite(
          basedir.toString(), sizes[i], conf);
      destPath = new Path (destPath,
          Long.toString(uniqueNumberGenerator.incrementAndGet()));
      FSDownload fsd =
          new FSDownload(files, UserGroupInformation.getCurrentUser(), conf,

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    rand.setSeed(sharedSeed);
    System.out.println("SEED: " + sharedSeed);


    Map<LocalResource, Future<Path>> pending = new HashMap<LocalResource, Future<Path>>();
    ExecutorService exec = Executors.newSingleThreadExecutor();
    LocalDirAllocator dirs = new LocalDirAllocator(
        TestFSDownload.class.getName());


    int size = rand.nextInt(512) + 512;
    LocalResourceVisibility vis = LocalResourceVisibility.PRIVATE;


    Path p = new Path(basedir, "" + 1);
    LocalResource rsrc = null;
    switch (fileType) {
    case TAR:
      rsrc = createTarFile(files, p, size, rand, vis);
      break;
    case JAR:
      rsrc = createJarFile(files, p, size, rand, vis);
      rsrc.setType(LocalResourceType.PATTERN);
      break;
    case ZIP:
      rsrc = createZipFile(files, p, size, rand, vis);
      break;
    case TGZ:
      rsrc = createTgzFile(files, p, size, rand, vis);
      break;
    }
    Path destPath = dirs.getLocalPathForWrite(basedir.toString(), size, conf);
    destPath = new Path (destPath,
        Long.toString(uniqueNumberGenerator.incrementAndGet()));
    FSDownload fsd = new FSDownload(files,
        UserGroupInformation.getCurrentUser(), conf, destPath, rsrc);
    pending.put(rsrc, exec.submit(fsd));

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    System.out.println("SEED: " + sharedSeed);


    Map<LocalResource,Future<Path>> pending =
      new HashMap<LocalResource,Future<Path>>();
    ExecutorService exec = Executors.newSingleThreadExecutor();
    LocalDirAllocator dirs =
      new LocalDirAllocator(TestFSDownload.class.getName());
    for (int i = 0; i < 5; ++i) {
      LocalResourceVisibility vis = LocalResourceVisibility.PRIVATE;
      if (i%2 == 1) {
        vis = LocalResourceVisibility.APPLICATION;
      }


      Path p = new Path(basedir, "dir" + i + ".jar");
      LocalResource rsrc = createJar(files, p, vis);
      rsrcVis.put(rsrc, vis);
      Path destPath = dirs.getLocalPathForWrite(
          basedir.toString(), conf);
      destPath = new Path (destPath,
          Long.toString(uniqueNumberGenerator.incrementAndGet()));
      FSDownload fsd =
          new FSDownload(files, UserGroupInformation.getCurrentUser(), conf,

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    files.mkdir(basedir, null, true);
    conf.setStrings(TestFSDownload.class.getName(), basedir.toString());


    ExecutorService singleThreadedExec = Executors.newSingleThreadExecutor();


    LocalDirAllocator dirs =
        new LocalDirAllocator(TestFSDownload.class.getName());
    Path destPath = dirs.getLocalPathForWrite(basedir.toString(), conf);
    destPath =
        new Path(destPath, Long.toString(uniqueNumberGenerator
            .incrementAndGet()));


    Path p = new Path(basedir, "dir" + 0 + ".jar");

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    TaskAttemptID mapId1 = new TaskAttemptID(
        new TaskID(jobId, TaskType.MAP, 1), 0);
    TaskAttemptID mapId2 = new TaskAttemptID(
        new TaskID(jobId, TaskType.MAP, 2), 0);
    
    LocalDirAllocator lda = new LocalDirAllocator(MRConfig.LOCAL_DIR);
    
    MergeManagerImpl<Text, Text> mergeManager = new MergeManagerImpl<Text, Text>(
        reduceId, jobConf, fs, lda, Reporter.NULL, null, null, null, null, null,
        null, null, new Progress(), new MROutputFiles());

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  private static void configureLocalDirs(Task task, JobConf job) throws IOException {
    String[] localSysDirs = StringUtils.getTrimmedStrings(
        System.getenv(Environment.LOCAL_DIRS.name()));
    job.setStrings(MRConfig.LOCAL_DIR, localSysDirs);
    LOG.info(MRConfig.LOCAL_DIR + " for child: " + job.get(MRConfig.LOCAL_DIR));
    LocalDirAllocator lDirAlloc = new LocalDirAllocator(MRConfig.LOCAL_DIR);
    Path workDir = null;
    // First, try to find the JOB_LOCAL_DIR on this host.
    try {
      workDir = lDirAlloc.getLocalPathToRead("work", job);
    } catch (DiskErrorException e) {
      // DiskErrorException means dir not found. If not found, it will
      // be created below.
    }
    if (workDir == null) {
      // JOB_LOCAL_DIR doesn't exist on this host -- Create it.
      workDir = lDirAlloc.getLocalPathForWrite("work", job);
      FileSystem lfs = FileSystem.getLocal(job).getRaw();
      boolean madeDir = false;
      try {
        madeDir = lfs.mkdirs(workDir);
      } catch (FileAlreadyExistsException e) {
        // Since all tasks will be running in their own JVM, the race condition
        // exists where multiple tasks could be trying to create this directory
        // at the same time. If this task loses the race, it's okay because
        // the directory already exists.
        madeDir = true;
        workDir = lDirAlloc.getLocalPathToRead("work", job);
      }
      if (!madeDir) {
          throw new IOException("Mkdirs failed to create "
              + workDir.toString());
      }

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