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From "Todd Lipcon (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-7346) Send back nicer error to clients using outdated IPC version
Date Mon, 06 Jun 2011 05:32:47 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-7346?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13044719#comment-13044719
] 

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 Send back nicer error to clients using outdated IPC version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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