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https://issues.apache.org/jira/browse/HADOOP-2735?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12566476#action_12566476
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Owen O'Malley commented on HADOOP-2735:
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This sounds way too complicated.
I propose java.io.tmp with a default of "./tmp". What ever the value is, it is
made absolute in localizeTask. So, if the user sets it to something absolute,
it is left alone. But the default will be made absolute before the
application's Task gets control.
> Setting default tmp directory for java createTempFile (java.io.tmpdir)
> ----------------------------------------------------------------------
>
> Key: HADOOP-2735
> URL: https://issues.apache.org/jira/browse/HADOOP-2735
> Project: Hadoop Core
> Issue Type: New Feature
> Components: mapred
> Reporter: Koji Noguchi
> Assignee: Amareshwari Sri Ramadasu
> Priority: Critical
> Fix For: 0.16.1
>
> Attachments: patch-2735.txt
>
>
> On our cluster, we've seen Pig(http://incubator.apache.org/pig/) filling up
> the /tmp and failing.
> (also inefficient since all the local tasks were spilling to the same disk)
> Pig is simply using java api createTempFile,
> http://java.sun.com/j2se/1.5.0/docs/api/java/io/File.html#createTempFile(java.lang.String,%20java.lang.String,%20java.io.File
> Can we add -Djava.io.tmpdir="./tmp" somewhere ?
> so that,
> 1) Tasks can utilize all disks when using tmp
> 2) Any undeleted tmp files will be deleted by the tasktracker when task(job?)
> is done.
> The easiest way is to set it inside mapred.child.java.opts in the config, but
> this can be overwritten if the users set their own task heapsize.
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