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2. maxTimestamp: change the semantic to maxTimestampDelta, and change type from int64 to varint. In most case, the timestamp for each record inside the batch should be very close. So, changing to varint will save space. The maxTimestamp can be calculated via [baseTimestamp + maxTimestampDelta]

3. lastOffsetDelta: change the type from int32 to varint. Same as above, In most case, the offset delta should be small. So, changing to varint will save space.

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