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https://issues.apache.org/jira/browse/HADOOP-7328?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13050632#comment-13050632
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Owen O'Malley commented on HADOOP-7328:
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{quote}
The audience for SerializationFactory is private to HDFS and MR.
{quote}
The annotations claiming it is limited private is *NOT* license to change it
without severe need. There *are* other users and this change will break them.
> Give more information about a missing Serializer class
> ------------------------------------------------------
>
> 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
>
> Attachments: HADOOP-7328.r1.diff, HADOOP-7328.r2.diff,
> HADOOP-7328.r3.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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