spark.ssl.keyStorePassword in plaintext on 'ps -ef' output of executor processes in Standalone mode

Run spark standalone mode, then start a spark-submit requiring at least 1 executor. Do a 'ps -ef' on linux (ie putty terminal) and you will be able to see  spark.ssl.keyStorePassword value in plaintext!

spark.ssl.keyStorePassword and  spark.ssl.keyPassword don't need to be passed to  CoarseGrainedExecutorBackend. Only  spark.ssl.trustStorePassword is used.

Can be resolved if below PR is merged:

[Github] Pull Request #21514 (tooptoop4)