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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-7346) Send back nicer error to clients using outdated IPC version
Date Wed, 01 Jun 2011 01:34:47 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-7346?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13041929#comment-13041929
] 

Hadoop QA commented on HADOOP-7346:
-----------------------------------

-1 overall.  Here are the results of testing the latest attachment 
  http://issues.apache.org/jira/secure/attachment/12481025/hadoop-7346.txt
  against trunk revision 1129905.

    +1 @author.  The patch does not contain any @author tags.

    -1 tests included.  The patch doesn't appear to include any new or modified tests.
                        Please justify why no new tests are needed for this patch.
                        Also please list what manual steps were performed to verify this patch.

    +1 javadoc.  The javadoc tool did not generate any warning messages.

    +1 javac.  The applied patch does not increase the total number of javac compiler warnings.

    +1 findbugs.  The patch does not introduce any new Findbugs (version 1.3.9) warnings.

    +1 release audit.  The applied patch does not increase the total number of release audit
warnings.

    +1 core tests.  The patch passed core unit tests.

    +1 system test framework.  The patch passed system test framework compile.

Test results: https://builds.apache.org/hudson/job/PreCommit-HADOOP-Build/550//testReport/
Findbugs warnings: https://builds.apache.org/hudson/job/PreCommit-HADOOP-Build/550//artifact/trunk/build/test/findbugs/newPatchFindbugsWarnings.html
Console output: https://builds.apache.org/hudson/job/PreCommit-HADOOP-Build/550//console

This message is automatically generated.

> Send back nicer error to clients using outdated IPC version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
>
>
> 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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