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https://issues.apache.org/jira/browse/HDFS-3721?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13422444#comment-13422444
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Suresh Srinivas commented on HDFS-3721:
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Todd, I will review this in a couple of days. Looking at the issue briefly,
this is only an issue with DataTransferProtocol, due to packet header length.
It should not happen in RPC right? I would be good to review RPC code once more
to confirm it.
In a related note, we should think about what backward/forward compatibility
for an alpha release means and how to handle it when we find issues.
> 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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