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From "Chao Sun" <chao....@cloudera.com>
Subject Re: Review Request 25394: HIVE-7503: Support Hive's multi-table insert query with Spark [Spark Branch]
Date Fri, 05 Sep 2014 20:35:46 GMT

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This is an automatically generated e-mail. To reply, visit:
https://reviews.apache.org/r/25394/
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(Updated Sept. 5, 2014, 8:35 p.m.)


Review request for hive, Brock Noland and Xuefu Zhang.


Bugs: HIVE-7503
    https://issues.apache.org/jira/browse/HIVE-7503


Repository: hive-git


Description
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For Hive's multi insert query (https://cwiki.apache.org/confluence/display/Hive/LanguageManual+DML),
there may be an MR job for each insert. When we achieve this with Spark, it would be nice
if all the inserts can happen concurrently.
It seems that this functionality isn't available in Spark. To make things worse, the source
of the insert may be re-computed unless it's staged. Even with this, the inserts will happen
sequentially, making the performance suffer.
This task is to find out what takes in Spark to enable this without requiring staging the
source and sequential insertion. If this has to be solved in Hive, find out an optimum way
to do this.


Diffs (updated)
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  ql/src/java/org/apache/hadoop/hive/ql/optimizer/GenMapRedUtils.java 9c808d4 
  ql/src/java/org/apache/hadoop/hive/ql/parse/spark/GenSparkProcContext.java 5ddc16d 
  ql/src/java/org/apache/hadoop/hive/ql/parse/spark/GenSparkUtils.java 379a39c 
  ql/src/java/org/apache/hadoop/hive/ql/parse/spark/GenSparkWork.java 864965e 
  ql/src/java/org/apache/hadoop/hive/ql/parse/spark/SparkCompiler.java 76fc290 
  ql/src/java/org/apache/hadoop/hive/ql/parse/spark/SparkMultiInsertionProcessor.java PRE-CREATION

  ql/src/java/org/apache/hadoop/hive/ql/parse/spark/SparkTableScanProcessor.java PRE-CREATION


Diff: https://reviews.apache.org/r/25394/diff/


Testing
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Thanks,

Chao Sun


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