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https://issues.apache.org/jira/browse/PIG-4120?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16176757#comment-16176757
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Satish Subhashrao Saley commented on PIG-4120:
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Updated patch in review board.
> Broadcast the index file in case of POMergeCoGroup and POMergeJoin
> ------------------------------------------------------------------
>
> Key: PIG-4120
> URL: https://issues.apache.org/jira/browse/PIG-4120
> Project: Pig
> Issue Type: Sub-task
> Components: tez
> Reporter: Rohini Palaniswamy
> Assignee: Satish Subhashrao Saley
> Fix For: 0.18.0
>
> Attachments: PIG-4120-1.patch, PIG-4120-2.patch
>
>
> Currently merge join and merge cogroup use two DAGs - the first DAG creates
> the index file in hdfs and second DAG does the merge join. Similar to
> replicate join, we can broadcast the index file and cache it and use it in
> merge join and merge cogroup. This will give better performance and also
> eliminate need for the second DAG.
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