I found another bug:
I want my users to use the resource as their hostname.
I changed in spark-core-2.9.3.jar>default.properties
# Force using hostname or version as a resource (both are "false" by default; only one can be # "true" at a time; if both are "true", then hostname will be used as a resource) HOSTNAME_AS_RESOURCE = false VERSION_AS_RESOURCE = true USE_HOSTNAME_AS_RESOURCE = true USE_VERSION_AS_RESOURCE = false
and change in the %AppData%\Roaming\Spark\spark.properties file:
And on the first run I see that everything is working fine, but if you use the close and reopen Spark 2.9.3, then the hostname will be the name of the computer.