offset हा प्रत्येक partition मधील प्रत्येक event साठी एक अद्वितीय, क्रमिक ID असून त्याची स्थिती दर्शवतो. उपभोक्ते offsets ट्रॅक करतात आणि commit करतात हे जाणून घेण्यासाठी की त्यांनी काय consume केले आहे, जे पुन्हा सुरू करणे, replay करणे आणि विश्वसनीय प्रक्रिया सक्षम करते.
Offsets काय आहेत
text
OFFSET → the position/ID of an event within a PARTITION:
→ each partition is an ordered log; events get incrementing offsets (0, 1, 2, ...)
→ an offset uniquely identifies an event's position in its partition
→ events are RETAINED → the log keeps events (offsets remain valid for the retention period)
उपभोक्ते offsets कसे वापरतात
text
→ a consumer reads events in order and tracks its CURRENT offset (where it has read to)
→ COMMITTING an offset → records "I've processed up to here" → on restart, resume from
the committed offset (don't reprocess everything)
→ consumers can SEEK to any offset → REPLAY old events, skip ahead, reprocess from a point
→ each consumer GROUP tracks its own offsets per partition (independent progress)