[jira] Commented: (HADOOP-2735) Setting default tmp directory for java createTempFile (java.io.tmpdir)

["Amareshwari Sri Ramadasu (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HADOOP-2735?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12565718#action_12565718 ] 

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

Yes. You can add -Djava.io.tmpdir=./tmp as part of mapred.child.java.opts. Moreover, mapred.child.java.opts can take many values space seperated, like
{noformat}
<property>
  <name>mapred.child.java.opts</name>
  <value>-Xmx200m -Djava.io.tmpdir=./tmp</value>
 </property>
{noformat}

But, the working directory of task doesnot have a 'tmp' directory already. I'm uploading a patch which will create it.

Koji, can you confirm whether this is what you wanted ? I tested this creating a temporary file in ./tmp from the map task.

> 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
>
>
> 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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