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From "Suresh Srinivas (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-3979) Fix hsync and hflush semantics.
Date Thu, 27 Sep 2012 03:41:08 GMT

     [ https://issues.apache.org/jira/browse/HDFS-3979?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Suresh Srinivas updated HDFS-3979:
----------------------------------

          Component/s: hdfs client
                       data-node
    Affects Version/s: 0.22.0
                       0.23.0
                       2.0.0-alpha
    
> 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
>
>
> 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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