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From "Sumadhur Reddy Bolli (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-3564) Design enhancements to the pluggable blockplacementpolicy
Date Mon, 17 Sep 2012 18:33:12 GMT

    [ https://issues.apache.org/jira/browse/HDFS-3564?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13457211#comment-13457211

Sumadhur Reddy Bolli commented on HDFS-3564:

Thanks Nicholas! I updated the description as per your suggestion.
> Design enhancements to the pluggable blockplacementpolicy
> ---------------------------------------------------------
>                 Key: HDFS-3564
>                 URL: https://issues.apache.org/jira/browse/HDFS-3564
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: name-node
>            Reporter: Sumadhur Reddy Bolli
>            Assignee: Sumadhur Reddy Bolli
>             Fix For: 1-win
>         Attachments: blockPlacementPolicy enhancements.pdf, policyenhancements-branch-1-win.patch
> Currently, it is assumed that no placement policy other than the default can work with
the balancer and that the minimum racks required for any placement policy is always 2. The
attached pdf suggests enhancements to the existing block placement policy abstraction to enable
the following
> a) Let placement policies decide if they are compatible with balancer
> b) Provide an api to move blocks for balancing
> c) Let the placement policy decide the minimum number of racks given the replication
> d) Also, the private methods in the default policy are made protected, similar to the
way its done in trunk, to enable easy derivation of custom policies.
> Please refer the pdf and the patch for details.

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