steveloughran opened a new pull request #2577:
URL: https://github.com/apache/hadoop/pull/2577


   This patch adds to hadoop-common the IOStatistics API
   to query IO object instances (filesystems, streams, remote iterators)
   for statistics on their I/O Usage: operation count and min/max/mean
   durations.
   
   Contributed by Steve Loughran.
   


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