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From "Suresh Srinivas (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 18:08:40 GMT

    [ https://issues.apache.org/jira/browse/HDFS-2825?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13191305#comment-13191305
] 

Suresh Srinivas commented on HDFS-2825:
---------------------------------------

Why are we adding another configuration to change the default behavior? 

If this is not required, using a different block placement policy, which is already pluggable
is the right way to go.
                
> 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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