[jira] [Created] (HDFS-2825) Add config option to turn off the writer preferring its local DN

["Todd Lipcon (Created) (JIRA)" <ji...@apache.org>]

Add config option to turn off the writer preferring its local DN
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                 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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