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https://issues.apache.org/jira/browse/HDFS-7891?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14366900#comment-14366900
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Walter Su commented on HDFS-7891:
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The previous testresult.txt is wrong. I simply let
maxNodesPerRack=Math.ceil(X/R), If choosing 14 targets from 13 racks,
maxNodesPerRack will be 2, and the number of invocation of random is much less.
It looks fast, but it's wrong.
I test again with {{ HDFS-7891.003.patch}} , and the result is correct, but not
good. So I'm re-considering sorted rack method.
> 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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