Why does stopping Standalone Spark master fail with "no org.apache.spark.deploy.master.Master to stop"?

Question

Stopping standalone spark master fails with the following message:

$ ./sbin/stop-master.sh 
no org.apache.spark.deploy.master.Master to stop

Why? There is one Spark Standalone master up and running.

Answer 1

Spark master was started under different user.

/tmp/Spark-ec2-user-org.apache.spark.deploy.master.Master-1.pid

Was not accessible.Had to login under different user who actually started the stand alone cluster manager master.