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From: "Jerry He (JIRA)" <jira@apache.org>
To: mapreduce-issues@hadoop.apache.org
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Subject: [jira] [Commented] (MAPREDUCE-5728) Check NPE for
 serializer/deserializer in MapTask
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    [ https://issues.apache.org/jira/browse/MAPREDUCE-5728?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13876671#comment-13876671 ] 

Jerry He commented on MAPREDUCE-5728:
-------------------------------------

Thanks, [~qwertymaniac]
I will take a look.

> 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
>             Fix For: 2.3.0, 2.2.1
>
>         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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