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distribution: handle sqrt peer view updates (#2871)

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* distribution: handle sqrt peer view updates

* someone please put rustc into my brain

* guide updates
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Andronik Ordian
2021-04-10 00:45:25 +02:00
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polkadot/roadmap/implementers-guide/src/node/utility/gossip-support.md
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@@ -9,3 +9,7 @@ from any validator in that set.
Gossiping subsystems will be notified when a new peer connects or disconnects by network bridge.
It is their responsibility to limit the amount of outgoing gossip messages.
At the moment we enforce a cap of `max(sqrt(peers.len()), 25)` message recipients at a time in each gossiping subsystem.
We also flip a coin with the same probability when handling peer view updates in the distribution subsystems.
Over time the probability of not handling a peer view update converges to zero, so it shouldn't be cause much trouble.
This should be considered as a temporary measure until we implement a more robust solution for gossiping.