Junping Du created HADOOP-8471:
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             Summary: Make ReplicaPlacementPolicyDefault extensible for reuse 
code in subclass
                 Key: HADOOP-8471
                 URL: https://issues.apache.org/jira/browse/HADOOP-8471
             Project: Hadoop Common
          Issue Type: Sub-task
          Components: ha, io
    Affects Versions: 2.0.0-alpha, 1.0.0
            Reporter: Junping Du
            Assignee: Junping Du


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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