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From "John Lee (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-7021) MapWritable NullPointerException
Date Tue, 15 Nov 2011 22:37:52 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-7021?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13150848#comment-13150848
] 

John Lee commented on HADOOP-7021:
----------------------------------

I accidentally changed the status of this issue to "In Progress" and I can not change it back
to "Patch Available" could someone assist me with this?

Also, I have noticed that this issue was submitted more than a year ago (with code to fix
the issue), since then I have updated the patch and test code for formatting and to be compatible
with the update build layout. Is there anything else that need to done to get this patch review
and committed? Thanks.
                
> 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
>            Priority: Minor
>             Fix For: 0.20.1
>
>         Attachments: 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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