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From "Rui Li (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HIVE-9097) Support runtime skew join for more queries [Spark Branch]
Date Mon, 15 Dec 2014 01:55:13 GMT
Rui Li created HIVE-9097:
----------------------------

             Summary: Support runtime skew join for more queries [Spark Branch]
                 Key: HIVE-9097
                 URL: https://issues.apache.org/jira/browse/HIVE-9097
             Project: Hive
          Issue Type: Bug
            Reporter: Rui Li


After HIVE-8913, runtime skew join is enabled for spark. But currently the optimization only
supports the simplest case where join is the leave ReduceWork in a work graph. This is because
the results from the original join and the conditional map join have to be unioned to feed
to downstream works, which can be a little tricky for spark.
This JIRA is to research and find a way to relax the above restriction. A possible solution
is to break the original task into two tasks on the join work, and insert the conditional
task in between.



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