Simplify BlockReader to not inherit from FSInputChecker
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Key: HDFS-2129
URL: https://issues.apache.org/jira/browse/HDFS-2129
Project: Hadoop HDFS
Issue Type: Sub-task
Components: hdfs client
Reporter: Todd Lipcon
Assignee: Todd Lipcon
BlockReader is currently quite complicated since it has to conform to the
FSInputChecker inheritance structure. It would be much simpler to implement it
standalone. Benchmarking indicates it's slightly faster, as well.
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