[performance] Try doctoring a dfsclient so it shortcircuits hdfs when blocks
are local
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Key: HBASE-1012
URL: https://issues.apache.org/jira/browse/HBASE-1012
Project: Hadoop HBase
Issue Type: Task
Reporter: stack
Ning Li up on list has stated that getting blocks using hdfs though the block
is local takes almost the same amount of time as accesing the block over the
network. See if can do something smarter when the data is known to be local
short-circuiting hdfs if we can in a subclass of DFSClient (George Porter
suggestion).
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