Tsuyoshi OZAWA created TEZ-1421:
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Summary: 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
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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