HDFS-4339. Persist inode id in fsimage and editlog. Contributed by Brandon Li.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1465835 13f79535-47bb-0310-9956-ffa450edef68
HDFS-3940. Add Gset#clear method and clear the block map when namenode is shutdown. Contributed by Suresh Srinivas.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1465851 13f79535-47bb-0310-9956-ffa450edef68
YARN-99. Modify private distributed cache to localize files such that no local directory hits unix file count limits and thus prevent job failures. Contributed by Omkar Vinit Joshi.


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1465853 13f79535-47bb-0310-9956-ffa450edef68
Merge remote branch 'origin/trunk' into trunk-gd
Merge remote branch 'origin/trunk-gd' into fb-Y-12345-trunk-gd