Spark Launcher

Spark Launcher 可以帮助开发人员轮询提交的 spark 作业的状态。基本上有八种状态可以被轮询。它们列在下面，含有这些含义::

/** The application has not reported back yet. */
UNKNOWN(false),
/** The application has connected to the handle. */
CONNECTED(false),
/** The application has been submitted to the cluster. */
SUBMITTED(false),
/** The application is running. */
RUNNING(false),
/** The application finished with a successful status. */
FINISHED(true),
/** The application finished with a failed status. */
FAILED(true),
/** The application was killed. */
KILLED(true),
/** The Spark Submit JVM exited with a unknown status. */
LOST(true);