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From "Olga Natkovich (JIRA)" <j...@apache.org>
Subject [jira] Updated: (PIG-1734) Pig needs a more efficient DAG execution
Date Thu, 03 Mar 2011 01:11:37 GMT

     [ https://issues.apache.org/jira/browse/PIG-1734?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

Olga Natkovich updated PIG-1734:

    Fix Version/s: 0.10

> Pig needs a more efficient DAG execution
> ----------------------------------------
>                 Key: PIG-1734
>                 URL: https://issues.apache.org/jira/browse/PIG-1734
>             Project: Pig
>          Issue Type: Improvement
>            Reporter: Olga Natkovich
>             Fix For: 0.10
> The current code uses Hadoop's Job control to execute one stage at a time. The first
stage includes all jobs with no dependencies, the second stage jobs that depend only on jobs
completed in the first stage, the third stage contains the jobs that depend on jobs from stage
1 and 2, etc.
> The problem with this simplistic approach is that each next stages only starts when the
previous stage is over which means means that some branches of the DAG are unnecessarily blocked.
> We would need to do our own DAG management to solve this issue which would be a pretty
significant undertaking. Something we should look at in the future.

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