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https://issues.apache.org/jira/browse/MAPREDUCE-5728?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15454829#comment-15454829
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Ying Zhang commented on MAPREDUCE-5728:
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Hi [~jinghe], we've encountered the same issue. The NPE really didn't provide
any information/hint on the problem here. Do we still intend to get this in?
> Check NPE for serializer/deserializer in MapTask
> ------------------------------------------------
>
> Key: MAPREDUCE-5728
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-5728
> Project: Hadoop Map/Reduce
> Issue Type: Improvement
> Components: client
> Affects Versions: 2.2.0
> Reporter: Jerry He
> Assignee: Jerry He
> Priority: Minor
> Labels: BB2015-05-TBR
> Attachments: MAPREDUCE-5728-trunk.patch
>
>
> Currently we will get NPE if the serializer/deserializer is not configured
> correctly.
> {code}
> 14/01/14 11:52:35 INFO mapred.JobClient: Task Id :
> attempt_201401072154_0027_m_000002_2, Status : FAILED
> java.lang.NullPointerException
> at
> org.apache.hadoop.mapred.MapTask$MapOutputBuffer.<init>(MapTask.java:944)
> at
> org.apache.hadoop.mapred.MapTask$NewOutputCollector.<init>(MapTask.java:672)
> at org.apache.hadoop.mapred.MapTask.runNewMapper(MapTask.java:740)
> at org.apache.hadoop.mapred.MapTask.run(MapTask.java:368)
> at org.apache.hadoop.mapred.Child$4.run(Child.java:255)
> at
> java.security.AccessController.doPrivileged(AccessController.java:362)
> at javax.security.auth.Subject.doAs(Subject.java:573)
> at
> org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1502)
> at org.apache.hadoop.mapred.Child.main(Child.java:249)
> {code}
> serializationFactory.getSerializer and serializationFactory.getDeserializer
> returns NULL in this case.
> Let's check NPE for serializer/deserializer in MapTask so that we don't get
> meaningless NPE.
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