Localizer (Hadoop 1.2.1 API)
Date: 2013-07-22

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## org.apache.hadoop.mapreduce.server.tasktracker
Class Localizer

    java.lang.Object
      org.apache.hadoop.mapreduce.server.tasktracker.Localizer

    public class Localizer

extends Object

NOTE: This class is internal only and not intended for users!!

Constructor Summary
`Localizer(FileSystem fileSys, String[] lDirs)` Create a Localizer instance

Method Summary
`void` | `initializeAttemptDirs(String user, String jobId, String attemptId)` Create taskDirs on all the disks.
`void` | `initializeUserDirs(String user)` Initialize the local directories for a particular user on this TT.

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Constructor Detail

### Localizer

    public Localizer(FileSystem fileSys,
                     String[] lDirs)

  Create a Localizer instance

  Parameters:
    `fileSys` -
    `lDirs` -

Method Detail

### initializeUserDirs

    public void initializeUserDirs(String user)
                            throws IOException

  Initialize the local directories for a particular user on this TT. This involves creation and setting permissions of the following directories
  - $mapred.local.dir/taskTracker/$user
  - $mapred.local.dir/taskTracker/$user/jobcache
  - $mapred.local.dir/taskTracker/$user/distcache

  Parameters:
    `user` -
  Throws:
    `IOException`

### initializeAttemptDirs

    public void initializeAttemptDirs(String user,
                                      String jobId,
                                      String attemptId)
                               throws IOException

  Create taskDirs on all the disks. Otherwise, in some cases, like when LinuxTaskController is in use, child might wish to balance load across disks but cannot itself create attempt directory because of the fact that job directory is writable only by the TT.

  Parameters:
    `user` -
    `jobId` -
    `attemptId` -
  Throws:
    `IOException`

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