when you build a spark standalone ha cluster, when you submit your app, you should send it to the leader master,
not the standby master, how to decided the status of the two masters?
a simple way, not judge the status which master is the active, you can just add
spark.master spark://master1:port,master2:port
in the $SPARK_HOME/conf/spark-defaults.conf
or else,
you can curl the web-ui for your spark master.
like curl sparkmaster:web-ui-port |grep STANDBY?