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From "Lars Hofhansl (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-3979) Fix hsync and hflush semantics.
Date Thu, 04 Oct 2012 20:45:47 GMT

    [ https://issues.apache.org/jira/browse/HDFS-3979?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13469671#comment-13469671
] 

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

I've seen that race when I write a test for HDFS-744. I "fixed" it there by updating the metrics
first... Ugh :)

I think I can make a test that fails at least with reasonable probability with the current
semantics.

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