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From "Hudson (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-3979) Fix hsync semantics
Date Wed, 07 Nov 2012 10:47:18 GMT

    [ https://issues.apache.org/jira/browse/HDFS-3979?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13492260#comment-13492260
] 

Hudson commented on HDFS-3979:
------------------------------

Integrated in Hadoop-Yarn-trunk #29 (See [https://builds.apache.org/job/Hadoop-Yarn-trunk/29/])
    HDFS-3979. For hsync, datanode should wait for the local sync to complete before sending
ack. Contributed by Lars Hofhansl (Revision 1406382)

     Result = SUCCESS
szetszwo : http://svn.apache.org/viewcvs.cgi/?root=Apache-SVN&view=rev&rev=1406382
Files : 
* /hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt
* /hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/BlockReceiver.java

                
> Fix hsync semantics
> -------------------
>
>                 Key: HDFS-3979
>                 URL: https://issues.apache.org/jira/browse/HDFS-3979
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: data-node
>    Affects Versions: 2.0.2-alpha
>            Reporter: Lars Hofhansl
>            Assignee: Lars Hofhansl
>             Fix For: 2.0.3-alpha
>
>         Attachments: hdfs-3979-sketch.txt, hdfs-3979-v2.txt, hdfs-3979-v3.txt, hdfs-3979-v4.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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