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Date: Thu, 7 Feb 2008 02:53:07 -0800 (PST)
From: "Amareshwari Sri Ramadasu (JIRA)" <jira@apache.org>
To: core-dev@hadoop.apache.org
Subject: [jira] Updated: (HADOOP-2735) Setting default tmp directory for
 java createTempFile (java.io.tmpdir)
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     [ https://issues.apache.org/jira/browse/HADOOP-2735?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Amareshwari Sri Ramadasu updated HADOOP-2735:
---------------------------------------------

    Status: Patch Available  (was: Open)

Here is the patch with config item "mapred.child.tmp", with default value ./tmp. 
If the value of mapred.child.tmp is not absolute path, it is prepended with task's working directory.
And task is run with option -Djava.io.tmpdir=<the absolute path of tmp dir>.

> 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, 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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