HBASE-10423 Report back the message of split or rollback failure to the master (Harsh J)

git-svn-id: https://svn.apache.org/repos/asf/hbase/branches/0.94@1561749 13f79535-47bb-0310-9956-ffa450edef68
HBASE-10371 Compaction creates empty hfile, then selects this file for compaction and creates empty hfile and over again. (binlijin)

git-svn-id: https://svn.apache.org/repos/asf/hbase/branches/0.94@1561810 13f79535-47bb-0310-9956-ffa450edef68