HBASE-8755 A new write thread model for HLog to improve the overall HBase write throughput

git-svn-id: https://svn.apache.org/repos/asf/hbase/trunk@1550778 13f79535-47bb-0310-9956-ffa450edef68
HBASE-9829 make the compaction logging less confusing

git-svn-id: https://svn.apache.org/repos/asf/hbase/trunk@1550866 13f79535-47bb-0310-9956-ffa450edef68
HBASE-10151 No-op HeapMemoryTuner

git-svn-id: https://svn.apache.org/repos/asf/hbase/trunk@1550871 13f79535-47bb-0310-9956-ffa450edef68
HBASE-10155 HRegion isRecovering state is wrongly coming in postOpen hook

git-svn-id: https://svn.apache.org/repos/asf/hbase/trunk@1550880 13f79535-47bb-0310-9956-ffa450edef68