@edu.umd.cs.findbugs.annotations.SuppressWarnings(value = "WA_AWAIT_NOT_IN_LOOP",
            justification = "Loop is in the caller method")
        @Override
        public void await() {
          if (cond == null) {
            cond = lock.newCondition();
          }
          cond.awaitUninterruptibly();
        }
Normal lock, will set the current thread as owner. Typically you should use try...finally to
call unlock in the finally block.
hbase-server/src/main/java/org/apache/hadoop/hbase/master/assignment/RegionStateNodeLock.java