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https://issues.apache.org/jira/browse/HIVE-3086?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13457754#comment-13457754
]
Hudson commented on HIVE-3086:
------------------------------
Integrated in Hive-trunk-h0.21 #1679 (See
[https://builds.apache.org/job/Hive-trunk-h0.21/1679/])
HIVE-3086. Skewed Join Optimization. njain via kevinwilfong (Revision
1386996)
Result = FAILURE
kevinwilfong :
http://svn.apache.org/viewcvs.cgi/?root=Apache-SVN&view=rev&rev=1386996
Files :
* /hive/trunk/common/src/java/org/apache/hadoop/hive/conf/HiveConf.java
* /hive/trunk/conf/hive-default.xml.template
* /hive/trunk/ql/src/java/org/apache/hadoop/hive/ql/exec/FilterOperator.java
* /hive/trunk/ql/src/java/org/apache/hadoop/hive/ql/exec/JoinOperator.java
* /hive/trunk/ql/src/java/org/apache/hadoop/hive/ql/exec/Operator.java
* /hive/trunk/ql/src/java/org/apache/hadoop/hive/ql/exec/ReduceSinkOperator.java
* /hive/trunk/ql/src/java/org/apache/hadoop/hive/ql/exec/SelectOperator.java
* /hive/trunk/ql/src/java/org/apache/hadoop/hive/ql/exec/TableScanOperator.java
* /hive/trunk/ql/src/java/org/apache/hadoop/hive/ql/optimizer/Optimizer.java
*
/hive/trunk/ql/src/java/org/apache/hadoop/hive/ql/optimizer/SkewJoinOptimizer.java
* /hive/trunk/ql/src/java/org/apache/hadoop/hive/ql/parse/SemanticAnalyzer.java
* /hive/trunk/ql/src/java/org/apache/hadoop/hive/ql/plan/ExprNodeColumnDesc.java
*
/hive/trunk/ql/src/java/org/apache/hadoop/hive/ql/plan/ExprNodeConstantDesc.java
* /hive/trunk/ql/src/java/org/apache/hadoop/hive/ql/plan/ExprNodeDesc.java
* /hive/trunk/ql/src/java/org/apache/hadoop/hive/ql/plan/ExprNodeFieldDesc.java
*
/hive/trunk/ql/src/java/org/apache/hadoop/hive/ql/plan/ExprNodeGenericFuncDesc.java
* /hive/trunk/ql/src/test/queries/clientpositive/skewjoinopt1.q
* /hive/trunk/ql/src/test/queries/clientpositive/skewjoinopt10.q
* /hive/trunk/ql/src/test/queries/clientpositive/skewjoinopt11.q
* /hive/trunk/ql/src/test/queries/clientpositive/skewjoinopt12.q
* /hive/trunk/ql/src/test/queries/clientpositive/skewjoinopt13.q
* /hive/trunk/ql/src/test/queries/clientpositive/skewjoinopt14.q
* /hive/trunk/ql/src/test/queries/clientpositive/skewjoinopt15.q
* /hive/trunk/ql/src/test/queries/clientpositive/skewjoinopt16.q
* /hive/trunk/ql/src/test/queries/clientpositive/skewjoinopt17.q
* /hive/trunk/ql/src/test/queries/clientpositive/skewjoinopt18.q
* /hive/trunk/ql/src/test/queries/clientpositive/skewjoinopt19.q
* /hive/trunk/ql/src/test/queries/clientpositive/skewjoinopt2.q
* /hive/trunk/ql/src/test/queries/clientpositive/skewjoinopt20.q
* /hive/trunk/ql/src/test/queries/clientpositive/skewjoinopt3.q
* /hive/trunk/ql/src/test/queries/clientpositive/skewjoinopt4.q
* /hive/trunk/ql/src/test/queries/clientpositive/skewjoinopt5.q
* /hive/trunk/ql/src/test/queries/clientpositive/skewjoinopt6.q
* /hive/trunk/ql/src/test/queries/clientpositive/skewjoinopt7.q
* /hive/trunk/ql/src/test/queries/clientpositive/skewjoinopt8.q
* /hive/trunk/ql/src/test/queries/clientpositive/skewjoinopt9.q
* /hive/trunk/ql/src/test/results/clientpositive/skewjoinopt1.q.out
* /hive/trunk/ql/src/test/results/clientpositive/skewjoinopt10.q.out
* /hive/trunk/ql/src/test/results/clientpositive/skewjoinopt11.q.out
* /hive/trunk/ql/src/test/results/clientpositive/skewjoinopt12.q.out
* /hive/trunk/ql/src/test/results/clientpositive/skewjoinopt13.q.out
* /hive/trunk/ql/src/test/results/clientpositive/skewjoinopt14.q.out
* /hive/trunk/ql/src/test/results/clientpositive/skewjoinopt15.q.out
* /hive/trunk/ql/src/test/results/clientpositive/skewjoinopt16.q.out
* /hive/trunk/ql/src/test/results/clientpositive/skewjoinopt17.q.out
* /hive/trunk/ql/src/test/results/clientpositive/skewjoinopt18.q.out
* /hive/trunk/ql/src/test/results/clientpositive/skewjoinopt19.q.out
* /hive/trunk/ql/src/test/results/clientpositive/skewjoinopt2.q.out
* /hive/trunk/ql/src/test/results/clientpositive/skewjoinopt20.q.out
* /hive/trunk/ql/src/test/results/clientpositive/skewjoinopt3.q.out
* /hive/trunk/ql/src/test/results/clientpositive/skewjoinopt4.q.out
* /hive/trunk/ql/src/test/results/clientpositive/skewjoinopt5.q.out
* /hive/trunk/ql/src/test/results/clientpositive/skewjoinopt6.q.out
* /hive/trunk/ql/src/test/results/clientpositive/skewjoinopt7.q.out
* /hive/trunk/ql/src/test/results/clientpositive/skewjoinopt8.q.out
* /hive/trunk/ql/src/test/results/clientpositive/skewjoinopt9.q.out
> Skewed Join Optimization
> ------------------------
>
> Key: HIVE-3086
> URL: https://issues.apache.org/jira/browse/HIVE-3086
> Project: Hive
> Issue Type: New Feature
> Components: Query Processor
> Reporter: Nadeem Moidu
> Assignee: Namit Jain
> Fix For: 0.10.0
>
> Attachments: hive.3086.1.patch, hive.3086.2.patch, hive.3086.3.patch,
> hive.3086.4.patch, hive.3086.5.patch, hive.3086.6.patch
>
>
> During a join operation, if one of the columns has a skewed key, it can cause
> that particular reducer to become the bottleneck. The following feature will
> address it:
> https://cwiki.apache.org/confluence/display/Hive/Skewed+Join+Optimization
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