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From "Allen Wittenauer (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-7021) MapWritable NullPointerException
Date Fri, 08 May 2015 18:09:01 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-7021?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14535130#comment-14535130
] 

Allen Wittenauer commented on HADOOP-7021:
------------------------------------------

I don't know why jenkins thinks this doesn't apply.  Let's fire it off.

> MapWritable NullPointerException
> --------------------------------
>
>                 Key: HADOOP-7021
>                 URL: https://issues.apache.org/jira/browse/HADOOP-7021
>             Project: Hadoop Common
>          Issue Type: Bug
>          Components: io
>    Affects Versions: 0.20.1, 0.21.0
>         Environment: Hadoop 0.20.1, Centos
>            Reporter: John Lee
>            Assignee: John Lee
>            Priority: Minor
>              Labels: BB2015-05-RFC
>         Attachments: HADOOP-7021.patch, HADOOP-7021.patch, HADOOP-7021.patch, HADOOP-7021.patch
>
>
> We have encountered a NullPointerException when we use MapWritable with custom Writable
objects.
> The root cause is the counter newClasses in AbstractMapWritable is allowed to get out
of sync with the id to class mapping tables when addToMap(Class) is called.  We have a patch
to AbstractMapWritable.addToMap(Class) that handles the case when newClasses gets out of sync
with the id to class mapping tables and adds a serialization optimization to minimize the
number of class names to write out per MapWritable object.



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