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From "John Lee (JIRA)" <j...@apache.org>
Subject [jira] Created: (HADOOP-7021) MapWritable NullPointerException
Date Fri, 05 Nov 2010 14:02:45 GMT
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
         Environment: Hadoop 0.20.1, Centos
            Reporter: John Lee
            Priority: Minor
             Fix For: 0.20.1


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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