public List<EventHandler> getQueuedEvents() {
      return queuedEvents;
    }
A snapshot of the status of a particular executor. This includes the contents of the executor's
pending queue, as well as the threads and events currently being processed. This is a
consistent snapshot that is immutable once constructed.
hbase-server/src/main/java/org/apache/hadoop/hbase/executor/ExecutorService.java