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https://issues.apache.org/jira/browse/HDFS-4946?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15152905#comment-15152905
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Kihwal Lee commented on HDFS-4946:
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Assigned it to [~nroberts] for now, the credit goes to the both gentlemen.
+1 the patch looks good.
> Allow preferLocalNode in BlockPlacementPolicyDefault to be configurable
> -----------------------------------------------------------------------
>
> Key: HDFS-4946
> URL: https://issues.apache.org/jira/browse/HDFS-4946
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: namenode
> Affects Versions: 2.0.0-alpha, 3.0.0, 2.7.2
> Reporter: James Kinley
> Assignee: Nathan Roberts
> Attachments: HDFS-4946-1.patch, HDFS-4946-2.patch
>
>
> Allow preferLocalNode in BlockPlacementPolicyDefault to be disabled in
> configuration to prevent clients from writing the first replica of every
> block (i.e. the entire file) to the local DataNode.
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