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gossip: do not try to connect if we are not validators (#2786)

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* gossip: do not issue a connection request if we are not a validator

* guide updates

* use all relevant authorities when issuing a request

* use AuthorityDiscoveryApi instead

* update comments to the status quo
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Andronik Ordian
2021-04-01 18:11:43 +02:00
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polkadot/roadmap/implementers-guide/src/node/utility/gossip-support.md
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# Gossip Support
The Gossip Support Subsystem is responsible for keeping track of session changes
and issuing a connection request to all validators in the next, current and a few past sessions
if we are a validator in these sessions.
The request will add all validators to a reserved PeerSet, meaning we will not reject a connection request
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.