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https://issues.apache.org/jira/browse/HDFS-4946?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Nathan Roberts updated HDFS-4946:
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Attachment: HDFS-4946-2.patch
Uploaded a new version of this patch for trunk. We have found this config to be
extremely useful across many large clusters. It avoids hot-spots for large
files that can be quite problematic during localization and/or task scheduling.
Hopefully folks will be agreeable to this simple config option.
> 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
> Reporter: James Kinley
> Assignee: James Kinley
> Attachments: HDFS-4946-1.patch, HDFS-4946-2.patch
>
>
> Allow preferLocalNode in BlockPlacementPolicyDefault to be disabled in
> configuration to prevent a client from writing the first replica of every
> block (i.e. the entire file) to the local DataNode.
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