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https://issues.apache.org/jira/browse/HDFS-2825?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13191685#comment-13191685
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Todd Lipcon commented on HDFS-2825:
-----------------------------------
Allen - I agree it would be useful to set on the writer side. But that's not
quite the original patch, which operates DFS-wide.
> 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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