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From "Owen O'Malley (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-7328) Give more information about a missing Serializer class
Date Thu, 16 Jun 2011 16:17:47 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-7328?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13050533#comment-13050533
] 

Owen O'Malley commented on HADOOP-7328:
---------------------------------------

Ugh. I hate the messages from review board.

This is a completely incompatible change. I'd propose adding a new method to SerializationFactory
that is about explaining why it wasn't found.

I need to get back to HADOOP-6685 and move that forward.

> 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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