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https://issues.apache.org/jira/browse/TEZ-1421?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14342730#comment-14342730
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Jonathan Eagles commented on TEZ-1421:
--------------------------------------
[~ozawa], feel free. Been busy as of late and this has unfortunately taken a
back seat.
> 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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