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From "Amareshwari Sri Ramadasu (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-2735) Setting default tmp directory for java createTempFile (java.io.tmpdir)
Date Wed, 06 Feb 2008 08:51:07 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-2735?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12566054#action_12566054
] 

Amareshwari Sri Ramadasu commented on HADOOP-2735:
--------------------------------------------------

bq. And when users set the heapsize, this tmp entry would be overwritten. Also, on Windows,
I'm not sure which tmp to set.

Shall we create tmp directory in task's working directory and make java.io.tmpdir=./tmp always?
This will remove setting a config item assuming tasks always use ./tmp for java.io.tmpdir.


> 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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