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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