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From "Arun C Murthy (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-2825) Add config option to turn off the writer preferring its local DN
Date Mon, 23 Jan 2012 17:56:40 GMT

    [ https://issues.apache.org/jira/browse/HDFS-2825?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13191296#comment-13191296
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Arun C Murthy commented on HDFS-2825:
-------------------------------------

I'm a little leery of adding more such arcane configs, wouldn't it be better to add a notion
of a block-placement policy? Maybe HDFS-1094, maybe some other jira along these lines?
                
> Add config option to turn off the writer preferring its local DN
> ----------------------------------------------------------------
>
>                 Key: HDFS-2825
>                 URL: https://issues.apache.org/jira/browse/HDFS-2825
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: name-node
>    Affects Versions: 0.23.0
>            Reporter: Todd Lipcon
>            Assignee: Todd Lipcon
>            Priority: Minor
>         Attachments: hdfs-2825.txt
>
>
> Currently, the default block placement policy always places the first replica in the
pipeline on the local node if there is a valid DN running there. In some network designs,
within-rack bandwidth is never constrained so this doesn't give much of an advantage. It would
also be really useful to disable this for MiniDFSCluster tests, since currently if you start
a multi-DN cluster and write with replication level 1, all of the replicas go to the same
DN.

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