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From "Olga Natkovich (JIRA)" <j...@apache.org>
Subject [jira] Created: (PIG-1734) Pig needs a more efficient DAG execution
Date Wed, 17 Nov 2010 01:57:13 GMT
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

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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