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https://issues.apache.org/jira/browse/HDFS-14220?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16856173#comment-16856173
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Íñigo Goiri commented on HDFS-14220:
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Filed HDFS-14546 to improve the documentation.
> Enable Replica Placement Value Per Rack
> ---------------------------------------
>
> Key: HDFS-14220
> URL: https://issues.apache.org/jira/browse/HDFS-14220
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: datanode
> Affects Versions: 2.7.1
> Reporter: Amithsha
> Assignee: Ayush Saxena
> Priority: Major
> Attachments: HDFS-14220-01.patch, HDFS-14220-02.patch
>
>
> By default, Replica placement per rack will be taken care by
> BlockPlacementPolicyDefault.java .
> With 2 if conditions
> # numOfRacks <1
> # numOfRacks > 1
> and the placement will happen as 1 on localrack, 2 on remote rack.
> If a user needs max of 1 replica per rack then
> BlockPlacementPolicyDefault.java modification is needed instead we can add a
> property to specify the placement policy and replica value per rack.
>
>
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