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From "tom pierce (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-7021) MapWritable NullPointerException
Date Fri, 30 Dec 2011 21:00:31 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-7021?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13177754#comment-13177754
] 

tom pierce commented on HADOOP-7021:
------------------------------------

Any reason this hasn't made it in yet?  Seems like every time John manages to get Hudson to
look at this patch, there's some unrelated (or at least not locally reproducable) problem
that causes a -1... 
                
> 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
>             Fix For: 0.20.1
>
>         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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