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From "Suresh Srinivas (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-3564) Design enhancements to the pluggable blockplacementpolicy
Date Tue, 10 Sep 2013 02:03:52 GMT

    [ https://issues.apache.org/jira/browse/HDFS-3564?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13762622#comment-13762622
] 

Suresh Srinivas commented on HDFS-3564:
---------------------------------------

bq. Looks like this change went in branch-1-win but not trunk or branch-1. Why is that? This
means the Windows code base is diverging from the other platforms, preventing this is why
changes are supposed to go through trunk first. IMO this needs to be done in trunk or we should
revert this change.

branch-1-win is for feature development. When and if it goes in to branch-1, before that it
will also go into trunk. I am not sure why a change from branch-1-win must go into trunk or
branch-1.
                
> 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: namenode
>            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
factor
> 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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