HBASE-9321 Contention getting the current user in RpcClient.writeRequest

git-svn-id: https://svn.apache.org/repos/asf/hbase/trunk@1518693 13f79535-47bb-0310-9956-ffa450edef68
HBASE-9353 HTable returned by MetaReader#getMetaHTable() is not closed in MetaEditor#addRegionToMeta()

git-svn-id: https://svn.apache.org/repos/asf/hbase/trunk@1518728 13f79535-47bb-0310-9956-ffa450edef68
HBASE-9247 Cleanup Key/KV/Meta/MetaKey Comparators


git-svn-id: https://svn.apache.org/repos/asf/hbase/trunk@1518817 13f79535-47bb-0310-9956-ffa450edef68