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https://issues.apache.org/jira/browse/HDFS-3498?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Junping Du reopened HDFS-3498:
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Reopen jira for backport to branch-2
> Make Replica Removal Policy pluggable and ReplicaPlacementPolicyDefault
> extensible for reusing code in subclass
> ---------------------------------------------------------------------------------------------------------------
>
> Key: HDFS-3498
> URL: https://issues.apache.org/jira/browse/HDFS-3498
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: namenode
> Affects Versions: 1.0.0, 2.0.0-alpha
> Reporter: Junping Du
> Assignee: Junping Du
> Fix For: 3.0.0
>
> Attachments: Hadoop-8471-BlockPlacementDefault-extensible.patch,
> HDFS-3498-branch-2.patch, HDFS-3498.patch, HDFS-3498-v2.patch,
> HDFS-3498-v3.patch, HDFS-3498-v4.patch, HDFS-3498-v5.patch
>
>
> ReplicaPlacementPolicy is already a pluggable component in Hadoop. However,
> the Replica Removal Policy is still nested in BlockManager that need to be
> separated out into a ReplicaPlacementPolicy then can be override later. Also
> it looks like hadoop unit test lack the testing on replica removal policy, so
> we add it here.
> On the other hand, as a implementation of ReplicaPlacementPolicy,
> ReplicaPlacementDefault still show lots of generic for other topology cases
> like: virtualization, and we want to make code in
> ReplicaPlacementPolicyDefault can be reused as much as possible so a few of
> its methods were changed from private to protected.
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