public int getActiveHandlerCount() {
    return activeHandlerCount.get();
  }
Comparator used by the "normal callQueue" if DEADLINE_CALL_QUEUE_CONF_KEY is set to true. It
uses the calculated "deadline" e.g. to deprioritize long-running job If multiple requests have
the same deadline BoundedPriorityBlockingQueue will order them in FIFO (first-in-first-out)
manner.
hbase-server/src/main/java/org/apache/hadoop/hbase/ipc/RpcExecutor.java