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Posted to mapreduce-issues@hadoop.apache.org by "Jerry He (JIRA)" <ji...@apache.org> on 2014/01/18 22:56:19 UTC
[jira] [Commented] (MAPREDUCE-5728) Guide NPE for
serializer/deserializer in MapTask
[ https://issues.apache.org/jira/browse/MAPREDUCE-5728?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13875754#comment-13875754 ]
Jerry He commented on MAPREDUCE-5728:
-------------------------------------
Attached a patch that follows what is being similarly done in org.apache.hadoop.io.SequenceFile
> Guide 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
> Fix For: 2.3.0, 2.2.1
>
>
> 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 guide NPE for serializer/deserializer in MapTask so that we don't get meaningless NPE.
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