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https://issues.apache.org/jira/browse/HADOOP-7151?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12999227#comment-12999227
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Hudson commented on HADOOP-7151:
--------------------------------
Integrated in Hadoop-Common-trunk-Commit #511 (See
[https://hudson.apache.org/hudson/job/Hadoop-Common-trunk-Commit/511/])
HADOOP-7151. Document need for stable hashCode() in WritableComparable.
Contributed by Dmitriy V. Ryaboy.
> Document need for stable hashCode() in WritableComparable
> ---------------------------------------------------------
>
> Key: HADOOP-7151
> URL: https://issues.apache.org/jira/browse/HADOOP-7151
> Project: Hadoop Common
> Issue Type: Bug
> Reporter: Dmitriy V. Ryaboy
> Assignee: Dmitriy V. Ryaboy
> Priority: Minor
> Fix For: 0.23.0
>
> Attachments: HADOOP-7151.patch, HADOOP-7151.patch
>
>
> When a Writable is used as a key, HashPartitioner implicitly assumes that
> hashCode() will return the same value across different instances of the JVM.
> This is not a guaranteed behavior in Java, and Object's default hashCode()
> does not in fact do this, which can lead to subtle bugs. This requirement
> should be explicitly called out.
> In addition the sample MyWritable in the javadoc for WritableComparable does
> not implement hashCode() and thus has a bug. That should be fixed.
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