cocagne
another two more questions. : )
first, where a value is judged to confirm in your code? and, if one of the servers certain a value is confirmed, how the other servers know? By the listener? Could you tell me where is it in you code? Thx!
A value is confirmed when the Paxos instance associated with that value comes to a resolution. That happens in composable_paxos.Learner.receive_accepted(). As to how the other servers know, they'll either see the same set of acceptance messages and come to the same conclusion via that method call or they'll have to "catch up" in some way by learning the result from a peer. That mechanism is implemented by one of the strategy/mixin classes. There is no official way to do it so you can come up with whatever approach makes sense for your application. The sync_strategy module implements a really simple mechanism that just queries peers every 10 seconds to see if they've fallen behind.
On Wed, Nov 2, 2016 at 10:31 AM, 肖金 [email protected] wrote:
first, where a value is judged to confirm in your code? and, if one of the servers certain a value is confirmed, how the other servers know? By the listener? Could you tell me where is it in you code? Thx!
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