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Date: Sun, 26 Jun 2011 18:25:47 +0000 (UTC)
From: "Harsh J (JIRA)" <jira@apache.org>
To: common-issues@hadoop.apache.org
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Subject: [jira] [Updated] (HADOOP-7328) Give more information about a
 missing Serializer class
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     [ https://issues.apache.org/jira/browse/HADOOP-7328?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Harsh J updated HADOOP-7328:
----------------------------

    Status: Open  (was: Patch Available)

> 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, HADOOP-7328.r4.diff, HADOOP-7328.r4.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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