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From "Lars Hofhansl (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-3979) Fix hsync and hflush semantics.
Date Wed, 26 Sep 2012 18:25:07 GMT

    [ https://issues.apache.org/jira/browse/HDFS-3979?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13464020#comment-13464020
] 

Lars Hofhansl commented on HDFS-3979:
-------------------------------------

More good discussion on HDFS-744.

Looks like we can just enqueu the seqno for the packet after the sync/flush is finished. (Khan's
idea)
                
> 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
>
> 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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