Concurrent "open mapfile reader" limit
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                 Key: HBASE-823
                 URL: https://issues.apache.org/jira/browse/HBASE-823
             Project: Hadoop HBase
          Issue Type: Improvement
            Reporter: stack


Over in HBASE-745, Luo Ning profiling found that the number of open Readers has 
direct impact on memory used.  This issue is about putting an upper bound on 
the number of open Readers doing something like a bounded pool w/ a LRU 
eviction policy.

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