[jira] Commented: (PIG-1734) Pig needs a more efficient DAG execution

["Santhosh Srinivasan (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/PIG-1734?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12933104#action_12933104 ] 

Santhosh Srinivasan commented on PIG-1734:
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+1 on the proposal to move to an external workflow execution engine. However note that the use of the workflow execution engine should not be enforced but should be optional.

> 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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