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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-7021) MapWritable NullPointerException
Date Wed, 22 Dec 2010 06:44:01 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-7021?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12974081#action_12974081
] 

Hadoop QA commented on HADOOP-7021:
-----------------------------------

-1 overall.  Here are the results of testing the latest attachment 
  http://issues.apache.org/jira/secure/attachment/12466768/HADOOP-7021.patch
  against trunk revision 1051659.

    +1 @author.  The patch does not contain any @author tags.

    +1 tests included.  The patch appears to include 3 new or modified tests.

    +1 javadoc.  The javadoc tool did not generate any warning messages.

    -1 javac.  The applied patch generated 1050 javac compiler warnings (more than the trunk's
current 1048 warnings).

    +1 findbugs.  The patch does not introduce any new Findbugs (version 1.3.9) warnings.

    +1 release audit.  The applied patch does not increase the total number of release audit
warnings.

    +1 core tests.  The patch passed core unit tests.

    +1 contrib tests.  The patch passed contrib unit tests.

    +1 system test framework.  The patch passed system test framework compile.

Test results: https://hudson.apache.org/hudson/job/PreCommit-HADOOP-Build/146//testReport/
Findbugs warnings: https://hudson.apache.org/hudson/job/PreCommit-HADOOP-Build/146//artifact/trunk/build/test/findbugs/newPatchFindbugsWarnings.html
Console output: https://hudson.apache.org/hudson/job/PreCommit-HADOOP-Build/146//console

This message is automatically generated.

> 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: AbstractMapWritable.diff, AbstractMapWritable.java, HADOOP-7021.patch,
TestMapWritableNPE.java
>
>
> 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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