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Date: Thu, 8 Mar 2012 18:23:58 +0000 (UTC)
From: "Vinod Kumar Vavilapalli (Reopened) (JIRA)" <jira@apache.org>
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Subject: [jira] [Reopened] (MAPREDUCE-3975) Default value not set for
 Configuration parameter mapreduce.job.local.dir
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     [ https://issues.apache.org/jira/browse/MAPREDUCE-3975?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Vinod Kumar Vavilapalli reopened MAPREDUCE-3975:
------------------------------------------------


Sorry for coming late on this:

bq. I think that it is fine to have them in different base directories, if it becomes a problem in practice because tasks are trying to share data with each other, then it can be fixed then.
This is exactly what the job.local.dir is intended for - sharing of data across tasks on the node. If the tasks only need scratch space, they can write in ./tmp directory which is already created by nodemanager. Even our documentation for the 20.**/1.** release lines explicitly says this.

We need to fix it. I am reopening this ticket.
                
> Default value not set for Configuration parameter mapreduce.job.local.dir
> -------------------------------------------------------------------------
>
>                 Key: MAPREDUCE-3975
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-3975
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>          Components: mrv2
>    Affects Versions: 0.23.1, 0.23.2
>            Reporter: Eric Payne
>            Assignee: Eric Payne
>            Priority: Blocker
>             Fix For: 0.23.2
>
>         Attachments: MAPREDUCE-3975-1.txt
>
>
> mapreduce.job.local.dir (formerly job.local.dir in 0.20) is not set by default. This is a regression from 0.20.205.
> In 0.20.205, JobLocalizer.createWorkDir() constructs the "$mapred.local.dir/taskTracker/$user/jobcache/$jobid/work" path based on $user and $jobid, and then sets TaskTracker.JOB_LOCAL_DIR in the job's JobConf.
> So far, I haven't found where this is done in 0.23. It could be that this is what should be done by LocalJobRunner.setupChildMapredLocalDirs(), but I am still investigating.

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