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https://issues.apache.org/jira/browse/HDFS-3979?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13464133#comment-13464133
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Lars Hofhansl commented on HDFS-3979:
-------------------------------------

(and sorry for misspelling you name)
                
> Fix hsync and hflush semantics.
> -------------------------------
>
>                 Key: HDFS-3979
>                 URL: https://issues.apache.org/jira/browse/HDFS-3979
>             Project: Hadoop HDFS
>          Issue Type: Bug
>            Reporter: Lars Hofhansl
>            Assignee: Lars Hofhansl
>         Attachments: hdfs-3979-sketch.txt
>
>
> See discussion in HDFS-744. The actual sync/flush operation in BlockReceiver 
> is not on a synchronous path from the DFSClient, hence it is possible that DN 
> loses data that is has already acknowledged as persisted to a client.

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