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https://issues.apache.org/jira/browse/HDFS-2320?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Suresh Srinivas resolved HDFS-2320.
-----------------------------------

      Resolution: Fixed
    Hadoop Flags: [Reviewed]

I committed this patch. This patch is only relevant to 0.20.205, due to merging 
0.20-append changes and is not relevant to trunk which has a new implementation 
of append.

> Make merged protocol changes from 0.20-append to 0.20-security compatible 
> with previous releases.
> -------------------------------------------------------------------------------------------------
>
>                 Key: HDFS-2320
>                 URL: https://issues.apache.org/jira/browse/HDFS-2320
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: data-node, hdfs client, name-node
>    Affects Versions: 0.20.205.0
>            Reporter: Suresh Srinivas
>            Assignee: Suresh Srinivas
>             Fix For: 0.20.205.0
>
>         Attachments: HDFS-2320.patch, HDFS-2320.patch
>
>
> 0.20-append changes have been merged to 0.20-security. The merge has changes 
> to version numbers in several protocols. This jira makes the protocol changes 
> compatible with older release, allowing clients running older version to talk 
> to server running 205 version and clients running 205 version talk to older 
> servers running 203, 204.

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