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From "Todd Lipcon (Created) (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-2825) Add config option to turn off the writer preferring its local DN
Date Mon, 23 Jan 2012 02:39:40 GMT
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

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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