Xuefu Zhang created HIVE-7384:
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Summary: Research into reduce-side join
Key: HIVE-7384
URL: https://issues.apache.org/jira/browse/HIVE-7384
Project: Hive
Issue Type: Sub-task
Components: Spark
Reporter: Xuefu Zhang
Hive's join operator is very sophisticated, especially for reduce-side join.
While we expect that other types of join, such as map-side join and SMB
map-side join, will work out of the box with our design, there may be some
complication in reduce-side join, which extensively utilizes key tag and
shuffle behavior. Our design principle prefer to make Hive implementation work
out of box also, which might requires new functionality from Spark. The tasks
is to research into this area, identifying requirements for Spark community and
work to be done on Hive to make reduce-side join work.
A design doc might be needed for this. For more information, please refer to
the overall design doc on wiki.
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