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https://issues.apache.org/jira/browse/HADOOP-7346?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13044719#comment-13044719
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Todd Lipcon commented on HADOOP-7346:
-------------------------------------
I checked with Nigel, he said he was cool with adding guava as a dependency in
0.22. So I've committed this to 22 as well.
> Send back nicer error to clients using outdated IPC version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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