MAPREDUCE-5222. Bring back some methods and constants in Jobclient for binary compatibility with mapred in 1.x. Contributed by Karthik Kambatla.


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1482208 13f79535-47bb-0310-9956-ffa450edef68
HADOOP-9459. ActiveStandbyElector can join election even before Service HEALTHY, and results in null data at ActiveBreadCrumb. Contributed by Vinay and Todd Lipcon.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1482227 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