执行程序阶段在收到事件时触发任务。执行者不会写入或存储事件。
将执行程序用作事件流中数据流触发器的一部分，以执行事件驱动的与管道相关的任务，例如在目标关闭时移动完全写入的文件。
可以使用的executors
- Amazon S3 - Creates new Amazon S3 objects for the specified content, copies objects within a bucket, or adds tags to existing Amazon S3 objects.
- Email - Sends custom email to the configured recipients upon receiving an event.
- HDFS File Metadata - Changes file metadata, creates an empty file, or removes a file or directory in HDFS or a local file system upon receiving an event record.
- Hive Query - Runs user-defined Hive or Impala queries upon receiving an event record.
- JDBC Query - Runs a user-defined SQL query upon receiving an event record.
- MapR FS File Metadata - Changes file metadata, creates an empty file, or removes a file or directory in MapR FS upon receiving an event record.
- MapReduce - Starts the specified MapReduce job upon receiving an event record.
- Pipeline Finisher - Stops and transitions the pipeline to a Finished state upon receiving an event record.
- Shell - Executes a shell script upon receiving an event record.
- Spark - Starts the specified Spark application upon receiving an event record.