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