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https://issues.apache.org/jira/browse/HADOOP-2116?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12557425#action_12557425
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Devaraj Das commented on HADOOP-2116:
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bq. Does this mean that all the taskdir will again use the same partition ?
No, the taskdir will be on different disks (using the LocalDirAllocator). The
common directories for all tasks of a given job will the
job.local.dir/jobCacheDir and the job_jar_xml (they will be configured/setup
once per job using the LocalDirAllocator).
> Job.local.dir to be exposed to tasks
> ------------------------------------
>
> Key: HADOOP-2116
> URL: https://issues.apache.org/jira/browse/HADOOP-2116
> Project: Hadoop
> Issue Type: Improvement
> Components: mapred
> Affects Versions: 0.14.3
> Environment: All
> Reporter: Milind Bhandarkar
> Assignee: Amareshwari Sri Ramadasu
> Fix For: 0.16.0
>
> Attachments: patch-2116.txt
>
>
> Currently, since all task cwds are created under a jobcache directory, users
> that need a job-specific shared directory for use as scratch space, create
> ../work. This is hacky, and will break when HADOOP-2115 is addressed. For
> such jobs, hadoop mapred should expose job.local.dir via localized
> configuration.
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