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From "Kan Zhang (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-3979) Fix hsync and hflush semantics.
Date Thu, 04 Oct 2012 21:13:50 GMT

    [ https://issues.apache.org/jira/browse/HDFS-3979?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13469712#comment-13469712
] 

Kan Zhang commented on HDFS-3979:
---------------------------------

bq. The race between ack and write errors should be reduced (eliminated) with this patch.

It should be eliminated with this patch. When there is write error, ack will not be queued.
                
> Fix hsync and hflush semantics.
> -------------------------------
>
>                 Key: HDFS-3979
>                 URL: https://issues.apache.org/jira/browse/HDFS-3979
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: data-node, hdfs client
>    Affects Versions: 0.22.0, 0.23.0, 2.0.0-alpha
>            Reporter: Lars Hofhansl
>            Assignee: Lars Hofhansl
>         Attachments: hdfs-3979-sketch.txt, hdfs-3979-v2.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 a DN loses data that it has
already acknowledged as persisted to a client.
> Edit: Spelling.

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