HBASE-8634 Fix potential null pointer dereference in HRegionServer and TableLockChecker (Ted Yu)



git-svn-id: https://svn.apache.org/repos/asf/hbase/trunk@1487533 13f79535-47bb-0310-9956-ffa450edef68
HBASE-8643 Do not log full classnames in logs, just the last two levels

git-svn-id: https://svn.apache.org/repos/asf/hbase/trunk@1487571 13f79535-47bb-0310-9956-ffa450edef68
HBASE-8639 very poor performance of htable#getscanner in multithreaded environment (Ted Yu)



git-svn-id: https://svn.apache.org/repos/asf/hbase/trunk@1487572 13f79535-47bb-0310-9956-ffa450edef68