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https://issues.apache.org/jira/browse/HIVE-2732?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Navis updated HIVE-2732:
------------------------
Component/s: Query Processor
Affects Version/s: 0.10.0
Fix Version/s: 0.10.0
> 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
> Components: Query Processor
> Affects Versions: 0.10.0
> Reporter: Kevin Wilfong
> Assignee: Navis
> Fix For: 0.10.0
>
> Attachments: ASF.LICENSE.NOT.GRANTED--HIVE-2732.D1809.1.patch,
> ASF.LICENSE.NOT.GRANTED--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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