You can use the Slider status CLI command to verify the application launch:

/usr/hdp/current/slider-client/bin/./slider status <application_name>

You can also verify the successful launch of the application with the YARN Resource Manager Web UI. In most instances, this UI is accessible via a web browser at port 8088 of the Resource Manager Host:

The specific information for the running application is accessible via the “ApplicationMaster” link that can be seen in the far right column of the row associated with the running application (probably the top row):