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MaxTimestamp from int64 (8 bytes) to 2 ~ 3 bytes. Suppose the max timestamp delta has a long 30 seconds, which only need 3 bytes for varlong. The offset delta save from int32 (4 bytes) to 1~2 bytes (the biggest value for 1 byte2 bytes of varint can be 16383).

About the length, we use int32(4 bytes) for now. But as analyzed above, we should have many small batches in the log. Even if it’s the default batch.size 16384, we only need 3 bytes to store by using varint. 

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