[Azkaban] No active executors found分析

启动AzkabanWebServer报如下错误：

点击进入 ActiveExecutors.setupExecutors发现调用的是

loadExecutors（）继续深入

private ImmutableSet loadExecutors() throws ExecutorManagerException {
  logger.info("Initializing executors from database.");
  return ImmutableSet.copyOf(this.executorLoader.fetchActiveExecutors());
}

继续深入调用JdbcExecutorLoader的fetchActiveExecutors方法

public List fetchActiveExecutors() throws ExecutorManagerException {
  return this.executorDao.fetchActiveExecutors();
}

继续深入调用DAO方法

List fetchActiveExecutors() throws ExecutorManagerException {
  try {
    return this.dbOperator
        .query(FetchExecutorHandler.FETCH_ACTIVE_EXECUTORS, new FetchExecutorHandler());