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From "Tsuyoshi Ozawa (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (TEZ-1421) MRCombiner throws NPE in MapredWordCount on master branch
Date Tue, 07 Jul 2015 13:13:04 GMT

    [ https://issues.apache.org/jira/browse/TEZ-1421?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14616670#comment-14616670
] 

Tsuyoshi Ozawa commented on TEZ-1421:
-------------------------------------

Sorry for the delay. I met this bug again. Starting to work this.

> MRCombiner throws NPE in MapredWordCount on master branch
> ---------------------------------------------------------
>
>                 Key: TEZ-1421
>                 URL: https://issues.apache.org/jira/browse/TEZ-1421
>             Project: Apache Tez
>          Issue Type: Bug
>            Reporter: Tsuyoshi Ozawa
>            Assignee: Tsuyoshi Ozawa
>            Priority: Critical
>
> I tested MapredWordCount against 70GB generated by RandowTextWriter. When a Combiner
runs, it throws NPE. It looks setCombinerClass doesn't work correctly.
> {quote}
> Caused by: java.lang.RuntimeException: java.lang.NullPointerException
> at org.apache.hadoop.util.ReflectionUtils.newInstance(ReflectionUtils.java:131)
> at org.apache.tez.mapreduce.combine.MRCombiner.runOldCombiner(MRCombiner.java:122)
> at org.apache.tez.mapreduce.combine.MRCombiner.combine(MRCombiner.java:112)
> at org.apache.tez.runtime.library.common.shuffle.impl.MergeManager.runCombineProcessor(MergeManager.java:472)
> at org.apache.tez.runtime.library.common.shuffle.impl.MergeManager$InMemoryMerger.merge(MergeManager.java:605)
> at org.apache.tez.runtime.library.common.shuffle.impl.MergeThread.run(MergeThread.java:89)
> {quote}



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