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Posted to hdfs-issues@hadoop.apache.org by "Lars Hofhansl (JIRA)" <ji...@apache.org> on 2012/09/26 06:54:08 UTC

[jira] [Commented] (HDFS-3979) Fix hsync and hflush semantics.

    [ https://issues.apache.org/jira/browse/HDFS-3979?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13463515#comment-13463515 ] 

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

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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