[jira] [Commented] (HADOOP-7021) MapWritable NullPointerException

["tom pierce (Commented) (JIRA)" <ji...@apache.org>]

    [ 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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