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https://issues.apache.org/jira/browse/TEZ-1421?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14270181#comment-14270181
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Jonathan Eagles commented on TEZ-1421:
--------------------------------------
[~ozawa], can you verify this still exists? I have tried to reproduce this
using the setup you described but am unable get find this NPE. If you are still
able to reproduce, please specify the steps needed for setup.
> 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
> Priority: Blocker
>
> 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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