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Date: Fri, 16 Oct 2009 10:04:31 -0700 (PDT)
From: "Hadoop QA (JIRA)" <jira@apache.org>
To: hdfs-issues@hadoop.apache.org
Subject: [jira] Commented: (HDFS-630) In
 DFSOutputStream.nextBlockOutputStream(), the client can exclude specific
 datanodes when locating the next block.
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    [ https://issues.apache.org/jira/browse/HDFS-630?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12766606#action_12766606 ] 

Hadoop QA commented on HDFS-630:
--------------------------------

-1 overall.  Here are the results of testing the latest attachment 
  http://issues.apache.org/jira/secure/attachment/12422242/0001-Fix-HDFS-630-for-0.21.patch
  against trunk revision 825689.

    +1 @author.  The patch does not contain any @author tags.

    +1 tests included.  The patch appears to include 9 new or modified tests.

    -1 patch.  The patch command could not apply the patch.

Console output: http://hudson.zones.apache.org/hudson/job/Hdfs-Patch-h5.grid.sp2.yahoo.net/69/console

This message is automatically generated.

> In DFSOutputStream.nextBlockOutputStream(), the client can exclude specific datanodes when locating the next block.
> -------------------------------------------------------------------------------------------------------------------
>
>                 Key: HDFS-630
>                 URL: https://issues.apache.org/jira/browse/HDFS-630
>             Project: Hadoop HDFS
>          Issue Type: New Feature
>          Components: hdfs client
>    Affects Versions: 0.21.0
>            Reporter: Ruyue Ma
>            Assignee: Ruyue Ma
>            Priority: Minor
>             Fix For: 0.21.0
>
>         Attachments: 0001-Fix-HDFS-630-for-0.21.patch, HDFS-630.patch
>
>
> created from hdfs-200.
> If during a write, the dfsclient sees that a block replica location for a newly allocated block is not-connectable, it re-requests the NN to get a fresh set of replica locations of the block. It tries this dfs.client.block.write.retries times (default 3), sleeping 6 seconds between each retry ( see DFSClient.nextBlockOutputStream).
> This setting works well when you have a reasonable size cluster; if u have few datanodes in the cluster, every retry maybe pick the dead-datanode and the above logic bails out.
> Our solution: when getting block location from namenode, we give nn the excluded datanodes. The list of dead datanodes is only for one block allocation.

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