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https://issues.apache.org/jira/browse/HDFS-3979?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13463515#comment-13463515
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Lars Hofhansl commented on HDFS-3979:
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Also see my comment here:
https://issues.apache.org/jira/browse/HDFS-744?focusedCommentId=13279619&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-13279619
> 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
>
> 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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