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https://issues.apache.org/jira/browse/HDFS-3721?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13430818#comment-13430818
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Aaron T. Myers commented on HDFS-3721:
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Thanks a lot for verifying that this patch introduces no performance
regressions, Todd.
Since I've reviewed Todd's original patch and addressed Suresh's feedback, and
since Todd has reviewed the functional difference between his original patch
and the one I posted, I'd like to go ahead and commit this patch. Unless I hear
something in the next day or so, I'm going to go ahead and commit this, so
please post your feedback promptly if you intend to review it.
> 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-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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