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Posted to issues@drill.apache.org by "Aman Sinha (JIRA)" <ji...@apache.org> on 2016/05/11 16:05:12 UTC

[jira] [Created] (DRILL-4667) Improve memory footprint of broadcast joins

Aman Sinha created DRILL-4667:
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             Summary: Improve memory footprint of broadcast joins
                 Key: DRILL-4667
                 URL: https://issues.apache.org/jira/browse/DRILL-4667
             Project: Apache Drill
          Issue Type: Improvement
          Components: Execution - Relational Operators
    Affects Versions: 1.6.0
            Reporter: Aman Sinha


For broadcast joins, currently Drill optimizes the data transfer across the network for broadcast table by sending a single copy to the receiving node which then distributes it to all minor fragments running on that particular node.  However, each minor fragment builds its own hash table (for a hash join) using this broadcast table.  We can substantially improve the memory footprint by having a shared copy of the hash table among multiple minor fragments on a node.  



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