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https://issues.apache.org/jira/browse/HADOOP-7328?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13101588#comment-13101588
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Hudson commented on HADOOP-7328:
--------------------------------
Integrated in Hadoop-Mapreduce-trunk-Commit #873 (See
[https://builds.apache.org/job/Hadoop-Mapreduce-trunk-Commit/873/])
HADOOP-7328. When a serializer class is missing, return null, not throw an
NPE. Contributed by Harsh J Chouraria.
todd : http://svn.apache.org/viewcvs.cgi/?root=Apache-SVN&view=rev&rev=1167363
Files :
* /hadoop/common/trunk/hadoop-common-project/hadoop-common/CHANGES.txt
*
/hadoop/common/trunk/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/io/serializer/SerializationFactory.java
*
/hadoop/common/trunk/hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/io/serializer/TestSerializationFactory.java
> When a serializer class is missing, return null, not throw an NPE.
> ------------------------------------------------------------------
>
> Key: HADOOP-7328
> URL: https://issues.apache.org/jira/browse/HADOOP-7328
> Project: Hadoop Common
> Issue Type: Improvement
> Components: io
> Affects Versions: 0.20.2
> Reporter: Harsh J
> Assignee: Harsh J
> Labels: io, serialization
> Fix For: 0.23.0, 0.24.0
>
> Attachments: 0.22-HADOOP-7328.r7.diff, 0.23-HADOOP-7328.r7.diff,
> HADOOP-7328.r1.diff, HADOOP-7328.r2.diff, HADOOP-7328.r3.diff,
> HADOOP-7328.r4.diff, HADOOP-7328.r4.diff, HADOOP-7328.r5.diff,
> HADOOP-7328.r6.diff, HADOOP-7328.r7.diff
>
>
> When you have a key/value class that's non Writable and you forget to attach
> io.serializers for the same, an NPE is thrown by the tasks with no
> information on why or what's missing and what led to it. I think a better
> exception can be thrown by SerializationFactory instead of an NPE when a
> class is not found accepted by any of the loaded ones.
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