HADOOP-9560. metrics2#JvmMetrics should have max memory size of JVM. Contributed by Tsuyoshi Ozawa.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1482372 13f79535-47bb-0310-9956-ffa450edef68
HADOOP-9307. BufferedFSInputStream.read returns wrong results after certain seeks. Contributed by Todd Lipcon.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1482377 13f79535-47bb-0310-9956-ffa450edef68
HADOOP-9220. Unnecessary transition to standby in ActiveStandbyElector. Contributed by Tom White and Todd Lipcon.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1482401 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