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Row Key Format
concat(topic, generation, publish_timestamp, seq_id)
topic- String representation of the topic name
generation- 4 bytes int representing the generation of this topic. Generation increase by one when at topic creation time.
publish_timestamp- 8 bytes time in milliseconds
seq_id- 2 bytes sequence ID. It is for uniquely identifying messages published in the same millisecond.
- The 2 bytes gives us 64M messages per second per topic, which is well over the limit we need
...
Row Key Format
concat(topic, generation, transaction_write_pointer, write_timestamp, p_seq_id)
topic- String representation of the topic name
generation- 4 bytes int representing the generation of this topic. Generation increase by one when at topic creation time.
transaction_write_pointer- 8 bytes transaction write pointer of the transaction that the message was published from
write_timestamp- 8 bytes time in milliseconds of the time when the message was persisted
- This is for ordering messages published in the same transaction
p_seq_id- 2 bytes sequence ID. It is for uniquely identifying messages published in the same millisecond.
...