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