एक offset एक partition के भीतर प्रत्येक event के लिए एक अद्वितीय, क्रमिक ID है — जो इसकी position को चिह्नित करता है। Consumers offsets को track और commit करते हैं ताकि जान सकें कि उन्होंने क्या consume किया है, जो resuming, replay और विश्वसनीय processing को सक्षम बनाता है।
Offsets क्या हैं
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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)
Consumers offsets का उपयोग कैसे करते हैं
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→ 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)