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From "Vinod Kumar Vavilapalli (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MAPREDUCE-3975) Default value not set for Configuration parameter mapreduce.job.local.dir
Date Thu, 08 Mar 2012 19:37:58 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-3975?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13225428#comment-13225428
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Vinod Kumar Vavilapalli commented on MAPREDUCE-3975:
----------------------------------------------------

bq. There are no guarantees that the tasks will run on the same node, so any mapreduce jobs
that use this need to be able to handle a task running by itself.
The feature helps to share resources on a node, whatever tasks run on this node can access
this, more like the private distributed cache.

bq. can we open a new JIRA for this?
Sure, let me close this and open a new 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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