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https://issues.apache.org/jira/browse/HADOOP-10898?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15633919#comment-15633919
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Vinicius Maciel Sant' Ana commented on HADOOP-10898:
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Hey there, Eli Acherkan.
Your issue is a duplicate from https://issues.apache.org/jira/browse/HADOOP-9295
The author there had the same problem and proposed a similar solution, maybe
you can help there.
> MapWritable instances cannot be reused when containing different custom
> Writable classes.
> -----------------------------------------------------------------------------------------
>
> Key: HADOOP-10898
> URL: https://issues.apache.org/jira/browse/HADOOP-10898
> Project: Hadoop Common
> Issue Type: Bug
> Components: io
> Reporter: Eli Acherkan
> Priority: Minor
> Attachments: HADOOP-10898.patch
>
>
> When a data stream contains several MapWritable instances, which contain
> instances of several different custom classes (implementing Writable),
> attempting to reuse a single MapWritable instance for reading the data stream
> results in an IllegalArgumentException. This happens because
> AbstractMapWritable.readFields doesn't reset the classToIdMap/idToClassMap
> data structures.
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