If the Integration Service is executing a Session task when you issue the stop command, the Integration Service stops reading data. It continues processing and writing data and committing data to targets. If the Integration Service cannot finish processing and committing data, you can issue the abort command.
The Integration Service handles the abort command for the Session task like the stop command, except it has a timeout period of 60 seconds. If the Integration Service cannot finish processing and committing data within the timeout period, it kills the DTM process and terminates the session.