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From "Harsh J (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HADOOP-7328) When a serializer class is missing, return null, not throw an NPE.
Date Sat, 10 Sep 2011 05:49:09 GMT

     [ https://issues.apache.org/jira/browse/HADOOP-7328?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

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

    Attachment: 0.20-security-HADOOP-7328.r7.diff

Ditto patch for 0.20-security.

* No tab/space issues, so those changes are not present.
* CommonConfigurationKeys does not seem populated enough in 0.20-security, so that part of
the patch isn't present either.

Tests pass
{code}

    [junit] Running org.apache.hadoop.io.serializer.TestSerializationFactory
    [junit] Tests run: 1, Failures: 0, Errors: 0, Time elapsed: 0.252 sec
{code}

Will upload complementing patch to MAPREDUCE-2584 since it is on the mapred/ side.

> 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: 0.20-security-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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