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https://issues.apache.org/jira/browse/HDFS-3564?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Sumadhur Reddy Bolli updated HDFS-3564:
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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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