HBASE-6110 adding more slow action log in critical write path (Liang Xie via stack)

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1597633 13f79535-47bb-0310-9956-ffa450edef68
HDFS-6227. ShortCircuitCache#unref should purge ShortCircuitReplicas whose streams have been closed by java interrupts. Contributed by Colin Patrick McCabe.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1597829 13f79535-47bb-0310-9956-ffa450edef68
Merge remote-tracking branch: upstream/trunk