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https://issues.apache.org/jira/browse/HADOOP-7346?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13044078#comment-13044078
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Todd Lipcon commented on HADOOP-7346:
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I'd like to commit this to 0.22 branch, since it really helps with version
transitions, and I think 0.22 should see more uptake than 0.21 did.
It applies cleanly, the only issue is that it requires guava as a dependency in
the tests. Anyone have an issue with my adding it to ivy? The other option is
to not include the tests in the commit (or reimplement the two methods we
need). Adding guava seems easiest and will also make it easier to backport
other patches from trunk which might use it, so that' my preference.
> Send back nicer error to clients using outdated IPC version
> -----------------------------------------------------------
>
> Key: HADOOP-7346
> URL: https://issues.apache.org/jira/browse/HADOOP-7346
> Project: Hadoop Common
> Issue Type: Improvement
> Components: ipc
> Affects Versions: 0.22.0
> Reporter: Todd Lipcon
> Assignee: Todd Lipcon
> Fix For: 0.22.0
>
> Attachments: hadoop-7346.txt, hadoop-7346.txt, hadoop-7346.txt
>
>
> When an older Hadoop version tries to contact a newer Hadoop version across
> an IPC protocol version bump, the client currently just gets a non-useful
> error message like "EOFException".
> Instead, the IPC server code can speak just enough of prior IPC protocols to
> send back a "fatal" message indicating the version mismatch.
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