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From "Zhe Zhang (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-7891) A block placement policy with best fault tolerance
Date Thu, 26 Mar 2015 18:39:53 GMT

    [ https://issues.apache.org/jira/browse/HDFS-7891?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14382417#comment-14382417
] 

Zhe Zhang commented on HDFS-7891:
---------------------------------

Thanks for the analysis Nicholas.

I guess you are assuming a placement policy of LN+LR+RR_1+RR_2...? The current {{BlockPlacementPolicyDefault}}
looks like LN+RR_1+RR_1

> 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-7891.004.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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