Implementations are provided herein for executive streaming data writes without duplication or loss. A client application and a pravega node can work to track where write data is, how much data has been written, and what specific data has been acknowledged by the pravega node as successfully written. In the event of an error or connection disruption, the client application can reconnect and determine how much data has been written and resend what data still needs to be written. The data can be written exactly once, and once written and acknowledged, will no longer be subject to data loss.