Examples of LocalDirAllocator

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.

Examples of org.apache.hadoop.fs.LocalDirAllocator

    }
    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 = TaskRunner.formWorkDir(lDirAlloc, taskId, false, conf);
    local.setWorkingDirectory(new Path(workDirName.toString()));
    FileSystem.get(conf).setWorkingDirectory(conf.getWorkingDirectory());
    
    // set up a classloader with the right classpath
    ClassLoader classLoader =
        makeClassLoader(conf, new File(workDirName.toString()));
    Thread.currentThread().setContextClassLoader(classLoader);
    conf.setClassLoader(classLoader);
    
    // split.dta file is used only by IsolationRunner. The file can now be in
    // any of the configured local disks, so use LocalDirAllocator to find out
    // where it is.
    Path localMetaSplit = 
        new LocalDirAllocator("mapred.local.dir").getLocalPathToRead(
            TaskTracker.getLocalSplitFile(conf.getUser(), taskId.getJobID()
                .toString(), taskId.toString()), conf);
    DataInputStream splitFile = FileSystem.getLocal(conf).open(localMetaSplit);
    TaskSplitIndex splitIndex = new TaskSplitIndex();
    splitIndex.readFields(splitFile);

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Examples of org.apache.hadoop.fs.LocalDirAllocator

        shuffleMetrics.serverHandlerBusy();
        if(ClientTraceLog.isInfoEnabled())
          startTime = System.nanoTime();
        outStream = response.getOutputStream();
        JobConf conf = (JobConf) context.getAttribute("conf");
        LocalDirAllocator lDirAlloc = 
          (LocalDirAllocator)context.getAttribute("localDirAllocator");
        FileSystem rfs = ((LocalFileSystem)
            context.getAttribute("local.file.system")).getRaw();


      String userName = null;
      String runAsUserName = null;
      synchronized (tracker.runningJobs) {
        RunningJob rjob = tracker.runningJobs.get(JobID.forName(jobId));
        if (rjob == null) {
          throw new IOException("Unknown job " + jobId + "!!");
        }
        userName = rjob.jobConf.getUser();
        runAsUserName = tracker.getTaskController().getRunAsUser(rjob.jobConf);
      }
      // Index file
      Path indexFileName =
          lDirAlloc.getLocalPathToRead(TaskTracker.getIntermediateOutputDir(
              userName, jobId, mapId)
              + "/file.out.index", conf);


      // Map-output file
      Path mapOutputFileName =
          lDirAlloc.getLocalPathToRead(TaskTracker.getIntermediateOutputDir(
              userName, jobId, mapId)
              + "/file.out", conf);


        /**
         * Read the index file to get the information about where

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Examples of org.apache.hadoop.fs.LocalDirAllocator

      this.trackerDistributerdCacheManager =
        new TrackerDistributedCacheManager(conf, new DefaultTaskController());
      this.taskDistributedCacheManager =
        trackerDistributerdCacheManager.newTaskDistributedCacheManager(conf);
      taskDistributedCacheManager.setup(
          new LocalDirAllocator("mapred.local.dir"),
          new File(systemJobDir.toString()),
          "archive", "archive");
      
      if (DistributedCache.getSymlink(conf)) {
        // This is not supported largely because,

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Examples of org.apache.hadoop.fs.LocalDirAllocator

      ServletContext context = getServletContext();
      int reduce = Integer.parseInt(reduceId);
      byte[] buffer = new byte[MAX_BYTES_TO_READ];
      OutputStream outStream = response.getOutputStream();
      JobConf conf = (JobConf) context.getAttribute("conf");
      LocalDirAllocator lDirAlloc = 
        (LocalDirAllocator)context.getAttribute("localDirAllocator");
      FileSystem fileSys = 
        (FileSystem) context.getAttribute("local.file.system");


      // Index file
      Path indexFileName = lDirAlloc.getLocalPathToRead(
                                            mapId+"/file.out.index", conf);
      FSDataInputStream indexIn = null;
         
      // Map-output file
      Path mapOutputFileName = lDirAlloc.getLocalPathToRead(
                                            mapId+"/file.out", conf);
      FSDataInputStream mapOutputIn = null;
        
      // true iff IOException was caused by attempt to access input
      boolean isInputException = true;

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Examples of org.apache.hadoop.fs.LocalDirAllocator

    int workerThreads = conf.getInt("tasktracker.http.threads", 40);
    server.setThreads(1, workerThreads);
    // let the jsp pages get to the task tracker, config, and other relevant
    // objects
    FileSystem local = FileSystem.getLocal(conf);
    this.localDirAllocator = new LocalDirAllocator("mapred.local.dir");
    server.setAttribute("task.tracker", this);
    server.setAttribute("local.file.system", local);
    server.setAttribute("conf", conf);
    server.setAttribute("log", LOG);
    server.setAttribute("localDirAllocator", localDirAllocator);

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Examples of org.apache.hadoop.fs.LocalDirAllocator

      }
    } else {
      this.conf = new JobConf(conf);
    }
    this.mapOutputFile.setConf(this.conf);
    this.lDirAlloc = new LocalDirAllocator("mapred.local.dir");
  }

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Examples of org.apache.hadoop.fs.LocalDirAllocator

                                      context.getAttribute("shuffleServerMetrics");
      try {
        shuffleMetrics.serverHandlerBusy();
        outStream = response.getOutputStream();
        JobConf conf = (JobConf) context.getAttribute("conf");
        LocalDirAllocator lDirAlloc = 
          (LocalDirAllocator)context.getAttribute("localDirAllocator");
        FileSystem fileSys = 
          (FileSystem) context.getAttribute("local.file.system");


        // Index file
        Path indexFileName = lDirAlloc.getLocalPathToRead(
            mapId+"/file.out.index", conf);
        
        // Map-output file
        Path mapOutputFileName = lDirAlloc.getLocalPathToRead(
            mapId+"/file.out", conf);


        /**
         * Read the index file to get the information about where
         * the map-output for the given reducer is available.

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Examples of org.apache.hadoop.fs.LocalDirAllocator

    this.shuffleServerMetrics = new ShuffleServerMetrics(fConf);
    server.setThreads(1, workerThreads);
    // let the jsp pages get to the task tracker, config, and other relevant
    // objects
    FileSystem local = FileSystem.getLocal(conf);
    this.localDirAllocator = new LocalDirAllocator("mapred.local.dir");
    server.setAttribute("task.tracker", this);
    server.setAttribute("local.file.system", local);
    server.setAttribute("conf", conf);
    server.setAttribute("log", LOG);
    server.setAttribute("localDirAllocator", localDirAllocator);

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Examples of org.apache.hadoop.fs.LocalDirAllocator

      this.conf = (JobConf) conf;
    } else {
      this.conf = new JobConf(conf);
    }
    this.mapOutputFile.setConf(this.conf);
    this.lDirAlloc = new LocalDirAllocator("mapred.local.dir");
    loadStaticResolutions(conf);
  }

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Examples of org.apache.hadoop.fs.LocalDirAllocator

      ArrayList<URL> urllist = new ArrayList<URL>();
      
      // add the jars and directories to the classpath
      String jar = conf.getJar();
      if (jar != null) {      
        LocalDirAllocator lDirAlloc = 
                            new LocalDirAllocator("mapred.local.dir");
        File jobCacheDir = new File(lDirAlloc.getLocalPathToRead(
                                      TaskTracker.getJobCacheSubdir() 
                                      + Path.SEPARATOR + getJobId() 
                                      + Path.SEPARATOR  
                                      + "work", conf).toString());

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