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From "Xuefu Zhang" <xzh...@cloudera.com>
Subject Re: Review Request 27627: Split map-join plan into 2 SparkTasks in 3 stages [Spark Branch]
Date Sat, 08 Nov 2014 15:15:48 GMT

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This is an automatically generated e-mail. To reply, visit:
https://reviews.apache.org/r/27627/#review60482
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ql/src/java/org/apache/hadoop/hive/ql/optimizer/physical/SparkMapJoinResolver.java
<https://reviews.apache.org/r/27627/#comment101882>

    This assumes that result SparkWorks will be linearly dependent on each other, which isn't
true in general.Let's say the are two works (w1 and w2), each having a map join operator.
w1 and w2 are connected to w3 via HTS. w3 also contains map join operator. Dependency in this
scenario will be graphic rather than linear.


- Xuefu Zhang


On Nov. 7, 2014, 6:07 p.m., Chao Sun wrote:
> 
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> This is an automatically generated e-mail. To reply, visit:
> https://reviews.apache.org/r/27627/
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> 
> (Updated Nov. 7, 2014, 6:07 p.m.)
> 
> 
> Review request for hive.
> 
> 
> Bugs: HIVE-8622
>     https://issues.apache.org/jira/browse/HIVE-8622
> 
> 
> Repository: hive-git
> 
> 
> Description
> -------
> 
> This is a sub-task of map-join for spark 
> https://issues.apache.org/jira/browse/HIVE-7613
> This can use the baseline patch for map-join
> https://issues.apache.org/jira/browse/HIVE-8616
> 
> 
> Diffs
> -----
> 
>   ql/src/java/org/apache/hadoop/hive/ql/optimizer/physical/SparkMapJoinResolver.java
PRE-CREATION 
>   ql/src/java/org/apache/hadoop/hive/ql/plan/SparkWork.java 66fd6b6 
> 
> Diff: https://reviews.apache.org/r/27627/diff/
> 
> 
> Testing
> -------
> 
> 
> Thanks,
> 
> Chao Sun
> 
>


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