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https://issues.apache.org/jira/browse/HDFS-7891?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14366868#comment-14366868
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Walter Su commented on HDFS-7891:
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4th. Another reason I prefer random policy with {{maxNodesPerRack}} is that I
don't have to worry about balance. The random algorithm chooses node from all
nodes. It doesn't chooses rack from all racks. If the distribution of nodes on
racks is skew, the policy will keep space balance.
> A block placement policy with best fault tolerance
> --------------------------------------------------
>
> Key: HDFS-7891
> URL: https://issues.apache.org/jira/browse/HDFS-7891
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Reporter: Walter Su
> Assignee: Walter Su
> Attachments: HDFS-7891.002.patch, HDFS-7891.003.patch,
> HDFS-7891.patch, PlacementPolicyBenchmark.txt, testresult.txt
>
>
> a block placement policy tries its best to place replicas to most racks.
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