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From "Koji Noguchi (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-2735) Setting default tmp directory for java createTempFile (java.io.tmpdir)
Date Tue, 05 Feb 2008 14:38:08 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-2735?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12565757#action_12565757
] 

Koji Noguchi commented on HADOOP-2735:
--------------------------------------

Thanks Amareshwari!

Even though I created this ticket, I don't know what should be done...

The problem I'm having is, 

- heapsize is sometimes set by users
- tmp is set by ops/admins


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

May I ask adding new conf entry?
<name>mapred.child.java.tmp</name>

And if <mapred.child.java.tmp> is set, 
1) Append -Djava.io.tmpdir=<mapred.child.java.tmp>   
2) If mapred.child.java.tmp doesn't exist, create one.



> 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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