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From "Hairong Kuang (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HDFS-589) Change block write protocol to support pipeline recovery
Date Mon, 14 Sep 2009 20:44:57 GMT

    [ https://issues.apache.org/jira/browse/HDFS-589?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12755184#action_12755184
] 

Hairong Kuang commented on HDFS-589:
------------------------------------

     [exec] +1 overall.  
     [exec] 
     [exec]     +1 @author.  The patch does not contain any @author tags.
     [exec] 
     [exec]     +1 tests included.  The patch appears to include 6 new or modified tests.
     [exec] 
     [exec]     +1 javadoc.  The javadoc tool did not generate any warning messages.
     [exec] 
     [exec]     +1 javac.  The applied patch does not increase the total number of javac compiler
warnings.
     [exec] 
     [exec]     +1 findbugs.  The patch does not introduce any new Findbugs warnings.
     [exec] 
     [exec]     +1 release audit.  The applied patch does not increase the total number of
release audit warnings.

> Change block write protocol to support pipeline recovery
> --------------------------------------------------------
>
>                 Key: HDFS-589
>                 URL: https://issues.apache.org/jira/browse/HDFS-589
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>    Affects Versions: Append Branch
>            Reporter: Hairong Kuang
>            Assignee: Hairong Kuang
>             Fix For: Append Branch
>
>         Attachments: opWriteProtocol.patch, opWriteProtocol1.patch
>
>
> Current block write operation's header has the following fields:
> blockId blockGS pipelineSize isRecovery clientName hasSource source #datanodesInDownStreamPipeline
downstreamDatanodes
> I'd like to change the header to be
> blockId blockGS pipelineSize clientName  flags blockMinLen blockMaxLen newGS hasSource
source #datanodesInDownStreamPipeline downstreamDatanodes
> With this protocol change, pipeline recovery will be performed when a mew pipeline is
set up.

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