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From "Lars Hofhansl (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-3721) hsync support broke wire compatibility
Date Thu, 26 Jul 2012 16:13:34 GMT

    [ https://issues.apache.org/jira/browse/HDFS-3721?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13423180#comment-13423180
] 

Lars Hofhansl commented on HDFS-3721:
-------------------------------------

Saw Todd's comment on HDFS-744 (moving that change to 2.0.x is not an option).
I had assumed that HDFS-744 would be in 2.0.x (in which case there would have been no compatibility
issues).

Had a quick look through the patch here. Looks good as far as I can tell, I'll take more detailed
look later today.

                
> hsync support broke wire compatibility
> --------------------------------------
>
>                 Key: HDFS-3721
>                 URL: https://issues.apache.org/jira/browse/HDFS-3721
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: data-node, hdfs client
>    Affects Versions: 2.1.0-alpha
>            Reporter: Todd Lipcon
>            Assignee: Todd Lipcon
>            Priority: Critical
>         Attachments: hdfs-3721.txt
>
>
> HDFS-744 added support for hsync to the data transfer wire protocol. However, it actually
broke wire compatibility: if the client has hsync support but the server does not, the client
cannot read or write data on the old cluster.

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