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From "Amir Youssefi (JIRA)" <j...@apache.org>
Subject [jira] Created: (PIG-138) Support for Multiple tmp directories and clean up
Date Fri, 07 Mar 2008 00:24:58 GMT
Support for Multiple tmp directories and clean up
-------------------------------------------------

                 Key: PIG-138
                 URL: https://issues.apache.org/jira/browse/PIG-138
             Project: Pig
          Issue Type: Improvement
         Environment: Pig Local
            Reporter: Amir Youssefi


This is to separate additional improvements and original requirement on PIG-129 issue.

Pasting comments of Pi Song. 

"I think the concept of multi-dir temp file creator (LocalDirAllocator in Hadoop) should be
adopted to Pig. What it does is:-

    * You can set up a set of tmp file dirs in configuration (They can be on different physical
drives so you can utilize more disk space)
    * When a temp file is being created, the system will probe the given temp dirs in round-robin
fashion
    * For a selected temp dir, if it exists and you have permission to write, temp file will
be created
    * For a selected temp dir, it it doesn't exist or you don't have permission to write,
the temp dir will be kept in the black list, thus not being used later on.
    * For the next temp file, move on to the next temp dir
"

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