[jira] [Created] (HDFS-2260) Refactor BlockReader into an interface and implementation

[Todd Lipcon (JIRA)]

Refactor BlockReader into an interface and implementation
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                 Key: HDFS-2260
                 URL: https://issues.apache.org/jira/browse/HDFS-2260
             Project: Hadoop HDFS
          Issue Type: Improvement
          Components: hdfs client
    Affects Versions: 0.23.0
            Reporter: Todd Lipcon
            Assignee: Todd Lipcon


For the new block reader in HDFS-2129, or the local block reader in HDFS-347, 
we need to be able to support different implementations. This JIRA is to simply 
refactor the current BlockReader into an interface and an implementation.

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