[PIG-129] need to create temp files in the task's working directory

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 0.1.0
• Assignee: Amir Youssefi
• Reporter: Olga Natkovich
• Created: 29/Feb/08 20:08
• Updated: 24/Mar/10 22:01
• Resolved: 07/Mar/08 01:09

Description

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 space.

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>