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From "Walter Su (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-7891) A block placement policy with best fault tolerance
Date Wed, 18 Mar 2015 09:21:39 GMT

    [ https://issues.apache.org/jira/browse/HDFS-7891?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14366868#comment-14366868
] 

Walter Su commented on HDFS-7891:
---------------------------------

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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