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Date: Tue, 18 Sep 2012 05:29:07 +1100 (NCT)
From: "Sumadhur Reddy Bolli (JIRA)" <jira@apache.org>
To: hdfs-issues@hadoop.apache.org
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Subject: [jira] [Updated] (HDFS-3564) Design enhancements to the pluggable
 blockplacementpolicy
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     [ https://issues.apache.org/jira/browse/HDFS-3564?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Sumadhur Reddy Bolli updated HDFS-3564:
---------------------------------------

    Description: 
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

  was:
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 that can be used by the balancer for balancing
c) Let the placment policy decide the minimum no of racks give


> 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 factor

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