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https://issues.apache.org/jira/browse/HADOOP-1775?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12522626
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Doug Cutting commented on HADOOP-1775:
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I assume the Thread.dumpStack() in MapWritable.clear() is unintentional?
> MapWritable and SortedMapWritable - Writable problems
> -----------------------------------------------------
>
> Key: HADOOP-1775
> URL: https://issues.apache.org/jira/browse/HADOOP-1775
> Project: Hadoop
> Issue Type: Bug
> Components: io
> Affects Versions: 0.15.0
> Reporter: Jim Kellerman
> Assignee: Jim Kellerman
> Fix For: 0.15.0
>
> Attachments: patch.txt
>
>
> When using the Writable interface for MapWritable and SortedMapWritable there
> are two errors:
> - in readFields, if there are a number of entries of a class that is not one
> of the "predefined" classes, the following exception is thrown:
> java.lang.IllegalArgumentException: Class <not predefined class name> already
> registered
> - readFields did not set the number of non-predefined classes. Consequently,
> making a copy of a copy that had entries of non-predefined classes would
> fail because the second copy would not receive the mapping from id to class
> and a NullPointerException would be thrown
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