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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 updated HDFS-3498:
-----------------------------

    Attachment: HDFS-3498.patch

Update to add the refactoring of replica removal policy from BlockManager to 
ReplicaPlacementPolicy for extension in sub-class.
                
> Make ReplicaPlacementPolicyDefault extensible for reuse code in subclass
> ------------------------------------------------------------------------
>
>                 Key: HDFS-3498
>                 URL: https://issues.apache.org/jira/browse/HDFS-3498
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: data-node
>    Affects Versions: 1.0.0, 2.0.0-alpha
>            Reporter: Junping Du
>            Assignee: Junping Du
>         Attachments: HDFS-3498.patch, 
> Hadoop-8471-BlockPlacementDefault-extensible.patch
>
>
> ReplicaPlacementPolicy is already a pluggable component in Hadoop. A user 
> specified ReplicaPlacementPolicy can be specified in the hdfs-site.xml 
> configuration under the key "dfs.block.replicator.classname". However, to 
> make it possible to reuse code in ReplicaPlacementPolicyDefault a few of its 
> methods were changed from private to protected. ReplicaPlacementPolicy and 
> BlockPlacementPolicyDefault are currently annotated with 
> @InterfaceAudience.Private.

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