Database Internals by Alex Petrov

Database Internals by Alex Petrov

Author:Alex Petrov
Language: eng
Format: epub, pdf
Publisher: O'Reilly Media
Published: 2019-05-14T16:00:00+00:00


Message order

Unreliable networks present us with two problems: messages can arrive out of order and, because of retransmits, some messages may arrive more than once. We have already introduced sequence numbers, and we can use these message identifiers on the recipient side to ensure first-in, first-out (FIFO) ordering. Since every message has a sequence number, the receiver can track:

nconsecutive, specifying the highest sequence number, up to which it has seen all messages. Messages up to this number can be put back in order.



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