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gossip: choose a random subset on send instead of limiting connections (#2776)

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* gossip: choose random subset on send

* naming bikeshed
This commit is contained in:
Andronik Ordian
2021-03-30 20:59:53 +02:00
committed by GitHub
parent a3115401c3
commit 9ac35d9f2b
10 changed files with 41 additions and 27 deletions
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polkadot/node/network/gossip-support/src/lib.rs
+1 -14
View File
@@ -19,7 +19,6 @@
//! the gossiping subsystems on every new session.
use futures::FutureExt as _;
use rand::seq::SliceRandom as _;
use polkadot_node_subsystem::{
messages::{
GossipSupportMessage,
@@ -103,17 +102,6 @@ async fn determine_relevant_validators(
Ok(validators)
}
// chooses a random subset of sqrt(v.len()), but at least 25 elements
fn choose_random_subset<T>(mut v: Vec<T>) -> Vec<T> {
let mut rng = rand::thread_rng();
v.shuffle(&mut rng);
let sqrt = (v.len() as f64).sqrt() as usize;
let len = std::cmp::max(25, sqrt);
v.truncate(len);
v
}
impl State {
/// 1. Determine if the current session index has changed.
/// 2. If it has, determine relevant validators
@@ -133,8 +121,7 @@ impl State {
if let Some((new_session, relay_parent)) = maybe_new_session {
tracing::debug!(target: LOG_TARGET, %new_session, "New session detected");
let validators = determine_relevant_validators(ctx, relay_parent, new_session).await?;
let validators = choose_random_subset(validators);
tracing::debug!(target: LOG_TARGET, targets = ?validators, "Issuing a connection request");
tracing::debug!(target: LOG_TARGET, num = ?validators.len(), "Issuing a connection request");
let request = validator_discovery::connect_to_validators_in_session(
ctx,