HDFS-4698. Provide client-side metrics for remote reads, local reads, and short-circuit reads. Contributed by Colin Patrick McCabe.


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1481121 13f79535-47bb-0310-9956-ffa450edef68
HDFS-4751. TestLeaseRenewer#testThreadName flakes. Contributed by Andrew Wang.


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1481160 13f79535-47bb-0310-9956-ffa450edef68
Merge remote branch 'origin/trunk' into trunk-gd
Merge remote branch 'origin/trunk-gd' into fb-HDFS-4312-trunk-gd