CloudSweeper is a internal cron process that checks for lost nodes on the target platform. Lost nodes refer to instances that exist on the platform originating from the current Stream Manager but are not registered in the Stream Manager database. Suspected lost nodes are initially added to a blacklist and then removed from the platform using the platform API. You can configure the cloudsweeper runtime via the instancecontroller.cloudCleanupInterval property in the red5-web.properties file.