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From "Pi Song (JIRA)" <j...@apache.org>
Subject [jira] Commented: (PIG-129) need to create temp files in the task's working directory
Date Tue, 04 Mar 2008 09:57:50 GMT

    [ https://issues.apache.org/jira/browse/PIG-129?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12574903#action_12574903

Pi Song commented on PIG-129:


I agree with you. But don't forget we're in an open source project. What you can also do for
a low priority task is to give a good direction and leave until someone will do it.

Go ahead on Hadoop side and please don't forget to keep implementation generic.

Here I will leave a simple implementation that will give an idea what I expect as a guideline.
If I have time on the weekend, I may come back to complete it.

> need to create temp files in the task's working directory
> ---------------------------------------------------------
>                 Key: PIG-129
>                 URL: https://issues.apache.org/jira/browse/PIG-129
>             Project: Pig
>          Issue Type: Bug
>            Reporter: Olga Natkovich
>            Assignee: Amir Youssefi
> Currently, pig creates temp data such is spilled bags in the directory specified by java.io.tmpdir.
The problem is that this directory is usually shared by all tasks and can easily run out of
> A better approach would be to create this files in the temp dir inside of the taks working
directory as these locations usually have much mor space and also they can be hosted on different
disks so the performance could be better.
> There are 2 parts to this fix:
> (1) in org.apache.pig.data.DataBag to check if the temp directory exists and create it
if not before trying to create the temp file. This is somewhere around line 390 in the code.
> (2) Change the mapred.child.java.opts in hadoop-site.xml to include new value for tmpdir
property to point to ./tmp. For instance: 
> <property>
>         <name>mapred.child.java.opts</name>
>         <value>-Xmx1024M -Djava.io.tmpdir="./tmp"</value>
>         <description>arguments passed to child jvms</description>
> </property>

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