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From "Todd Lipcon (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-2825) Add test hook to turn off the writer preferring its local DN
Date Fri, 27 Jan 2012 04:15:42 GMT

    [ https://issues.apache.org/jira/browse/HDFS-2825?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13194436#comment-13194436
] 

Todd Lipcon commented on HDFS-2825:
-----------------------------------

Maybe we should open a new JIRA to do this as a client-side config, where the client would
pass a new flag when asking the NN for a pipeline?
                
> Add test hook 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
>             Fix For: 0.24.0, 0.23.1
>
>         Attachments: hdfs-2825.txt, 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.
> _[per discussion below, this was changed to not add a config, but only to add a hook
for testing]_

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