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https://issues.apache.org/jira/browse/HADOOP-4276?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12642273#action_12642273
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Chris Douglas commented on HADOOP-4276:
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+1
> The mapred.*ID classes are inefficient for hashCode and serialization
> ---------------------------------------------------------------------
>
> Key: HADOOP-4276
> URL: https://issues.apache.org/jira/browse/HADOOP-4276
> Project: Hadoop Core
> Issue Type: Improvement
> Reporter: Owen O'Malley
> Assignee: Owen O'Malley
> Fix For: 0.20.0
>
> Attachments: h4276.patch, h4276.patch
>
>
> Currently the ID classes call toString and hash the resulting string rather
> than computing a hash directly.
> The ID classes also create new instances of the higher level object in
> readFields (via read) rather than re-using the object via readFields.
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