Hi, In order to obtain an exactly-once semantics, we are thinking of doing at-least-once processing, and then have a compensation mechanism to fix the results in few minutes by correcting them by substracting the effects of the duplicates. However, in order to do that, it seems that at least this compensation mechanism needs to read from a topic and commit offsets every message, so that when failover happens, it would not interpret as duplicates the events from the latest commit until present. What are the performance implications of this, and what advice would you have for exactly-once behavior (at least with controllable error)? Thank you, Nicu Marasoiu Geschäftsanschrift/Business address: METRO SYSTEMS GmbH, Metro-Straße 12, 40235 Düsseldorf, Germany Aufsichtsrat/Supervisory Board: Heiko Hutmacher (Vorsitzender/ Chairman) Geschäftsführung/Management Board: Dr. Dirk Toepfer (Vorsitzender/CEO), Wim van Herwijnen Sitz Düsseldorf, Amtsgericht Düsseldorf, HRB 18232/Registered Office Düsseldorf, Commercial Register of the Düsseldorf Local Court, HRB 18232
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