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https://issues.apache.org/jira/browse/HIVE-6939?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13975990#comment-13975990
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Jason Dere commented on HIVE-6939:
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It appears that on hadoop-2 there are multiple output files for this test,
whereas on hadoop-1 there is just a single file. Also the test looks like it
assumes there is just a single file to compare to.
This test for some reason is specifying 5 reducers. I've been told that
hadoop-1 Hive did not obey the number of reducers, while hadoop-2 does. This
could explain why this test works for hadoop-1 since if it only ever used 1
reducer and generated a single output file.
Changing this test to use just a single reducer allows the test to pass with
hadoop-2. Does anyone know the history of this test and why it was set to use
5 reducers?
> TestExecDriver.testMapRedPlan3 fails on hadoop-2
> ------------------------------------------------
>
> Key: HIVE-6939
> URL: https://issues.apache.org/jira/browse/HIVE-6939
> Project: Hive
> Issue Type: Bug
> Components: Tests
> Reporter: Jason Dere
> Assignee: Jason Dere
>
> Passes on hadoop-1, but fails on hadoop-2.
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