Sunday, February 8, 2009

guaranteed delivery (GD) vs NGD

i think GD stipulates exactly one delivery for each message, in expected sequence. Basic expectation in most async transactional environments. For trade booking, that's the only acceptable delivery. NGD can deliver 0, 1 or many times for the same message. GD requirements include, but is not limited to

* persistent store
* (in the case of pub/sub) durable subscription, so a subscriber can safely go offline
* acknowledgments

Q: if client is offline and comes online, does GD and NGD behave any different?
A: i guess NGD may not deliver all the missed messages.

Q: if volume is high, does GD vs NGD offer any advantage?
A: multicast is most efficient and is usually NGD.

Q: I feel GD is too expensive for broadcast when volume and subscriber counts are high, right?
A: i think so.

Q: what about messages containing other people's trades executed on the open market?
A: If you are following a particular security and want to track a particular investor's position, then you need GD. Like a poker game.

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