[jira] [Commented] (HIVE-2732) Reduce Sink deduplication fails if the child reduce sink is followed by a join

["Namit Jain (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HIVE-2732?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13274797#comment-13274797 ] 

Namit Jain commented on HIVE-2732:
----------------------------------

+1

Running tests
                
> Reduce Sink deduplication fails if the child reduce sink is followed by a join
> ------------------------------------------------------------------------------
>
>                 Key: HIVE-2732
>                 URL: https://issues.apache.org/jira/browse/HIVE-2732
>             Project: Hive
>          Issue Type: Bug
>            Reporter: Kevin Wilfong
>            Assignee: Navis
>         Attachments: HIVE-2732.D1809.1.patch, HIVE-2732.D1809.2.patch
>
>
> set hive.optimize.reducededuplication=true;
> set hive.auto.convert.join=true;
> explain select * from (select * from src distribute by key sort by key) a join src b on a.key = b.key;
> fails with the following exception
> java.lang.ClassCastException: org.apache.hadoop.hive.ql.exec.SelectOperator cannot be cast to org.apache.hadoop.hive.ql.exec.ReduceSinkOperator
> 	at org.apache.hadoop.hive.ql.optimizer.MapJoinProcessor.convertMapJoin(MapJoinProcessor.java:313)
> 	at org.apache.hadoop.hive.ql.optimizer.MapJoinProcessor.genMapJoinOpAndLocalWork(MapJoinProcessor.java:226)
> 	at org.apache.hadoop.hive.ql.optimizer.physical.CommonJoinResolver$CommonJoinTaskDispatcher.processCurrentTask(CommonJoinResolver.java:174)
> 	at org.apache.hadoop.hive.ql.optimizer.physical.CommonJoinResolver$CommonJoinTaskDispatcher.dispatch(CommonJoinResolver.java:287)
> 	at org.apache.hadoop.hive.ql.lib.TaskGraphWalker.dispatch(TaskGraphWalker.java:111)
> 	at org.apache.hadoop.hive.ql.lib.TaskGraphWalker.walk(TaskGraphWalker.java:194)
> 	at org.apache.hadoop.hive.ql.lib.TaskGraphWalker.startWalking(TaskGraphWalker.java:139)
> 	at org.apache.hadoop.hive.ql.optimizer.physical.CommonJoinResolver.resolve(CommonJoinResolver.java:68)
> 	at org.apache.hadoop.hive.ql.optimizer.physical.PhysicalOptimizer.optimize(PhysicalOptimizer.java:72)
> 	at org.apache.hadoop.hive.ql.parse.SemanticAnalyzer.genMapRedTasks(SemanticAnalyzer.java:7019)
> 	at org.apache.hadoop.hive.ql.parse.SemanticAnalyzer.analyzeInternal(SemanticAnalyzer.java:7312)
> 	at org.apache.hadoop.hive.ql.parse.BaseSemanticAnalyzer.analyze(BaseSemanticAnalyzer.java:243)
> 	at org.apache.hadoop.hive.ql.parse.ExplainSemanticAnalyzer.analyzeInternal(ExplainSemanticAnalyzer.java:48)
> 	at org.apache.hadoop.hive.ql.parse.BaseSemanticAnalyzer.analyze(BaseSemanticAnalyzer.java:243)
> 	at org.apache.hadoop.hive.ql.Driver.compile(Driver.java:430)
> 	at org.apache.hadoop.hive.ql.Driver.compile(Driver.java:337)
> 	at org.apache.hadoop.hive.ql.Driver.run(Driver.java:889)
> 	at org.apache.hadoop.hive.cli.CliDriver.processLocalCmd(CliDriver.java:255)
> 	at org.apache.hadoop.hive.cli.CliDriver.processCmd(CliDriver.java:212)
> 	at org.apache.hadoop.hive.cli.CliDriver.processLine(CliDriver.java:403)
> 	at org.apache.hadoop.hive.cli.CliDriver.run(CliDriver.java:671)
> 	at org.apache.hadoop.hive.cli.CliDriver.main(CliDriver.java:554)
> 	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
> 	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
> 	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
> 	at java.lang.reflect.Method.invoke(Method.java:597)
> 	at org.apache.hadoop.util.RunJar.main(RunJar.java:156)
> If hive.auto.convert.join is set to false, it produces an incorrect plan where the two halves of the join are processed in two separate map reduce tasks, and the reducers of these two tasks both contain the join operator resulting in an exception.

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