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Date: Sat, 4 Jun 2011 11:15:48 +0000 (UTC)
From: "Hudson (JIRA)" <jira@apache.org>
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Subject: [jira] [Commented] (HADOOP-7346) Send back nicer error to clients
 using outdated IPC version
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    [ https://issues.apache.org/jira/browse/HADOOP-7346?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13044275#comment-13044275 ] 

Hudson commented on HADOOP-7346:
--------------------------------

Integrated in Hadoop-Common-trunk #709 (See [https://builds.apache.org/hudson/job/Hadoop-Common-trunk/709/])
    HADOOP-7346. Send back nicer error message to clients using outdated IPC version. Contributed by Todd Lipcon.

todd : http://svn.apache.org/viewcvs.cgi/?root=Apache-SVN&view=rev&rev=1131254
Files : 
* /hadoop/common/trunk/CHANGES.txt
* /hadoop/common/trunk/src/java/org/apache/hadoop/ipc/Server.java
* /hadoop/common/trunk/src/test/core/org/apache/hadoop/ipc/TestIPC.java


> Send back nicer error to clients using outdated IPC version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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