public Map<String, ExecutorStatus> getAllExecutorStatuses() {
    Map<String, ExecutorStatus> ret = Maps.newHashMap();
    for (Map.Entry<String, Executor> e : executorMap.entrySet()) {
      ret.put(e.getKey(), e.getValue().getStatus());
    }
    return ret;
  }
Initialize the executor lazily, Note if an executor need to be initialized lazily, then all
paths should use this method to get the executor, should not start executor by using
{@link ExecutorService#startExecutorService(ExecutorConfig)}
hbase-server/src/main/java/org/apache/hadoop/hbase/executor/ExecutorService.java