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keep failed finalized chains to avoid retries (#3142)

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## Issue Addressed

In very rare occasions we've seen most if not all our peers in a chain with which we don't agree. Purging these peers can take a very long time: number of retries of the chain. Meanwhile sync is caught in a loop trying the chain again and again. This makes it so that we fast track purging peers via registering the failed chain to prevent retrying for some time (30 seconds). Longer times could be dangerous since a chain can fail if a batch fails to download for example. In this case, I think it's still acceptable to fast track purging peers since they are nor providing the required info anyway 

Co-authored-by: Divma <26765164+divagant-martian@users.noreply.github.com>
This commit is contained in:
Divma
2022-04-13 01:10:55 +00:00
parent aa72088f8f
commit 7366266bd1
6 changed files with 114 additions and 148 deletions
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29
beacon_node/network/src/sync/range_sync/range.rs
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@@ -49,13 +49,18 @@ use crate::sync::manager::Id;
use crate::sync::network_context::SyncNetworkContext;
use crate::sync::BatchProcessResult;
use beacon_chain::{BeaconChain, BeaconChainTypes};
use lighthouse_network::rpc::GoodbyeReason;
use lighthouse_network::PeerId;
use lighthouse_network::SyncInfo;
use slog::{crit, debug, error, trace};
use lru_cache::LRUTimeCache;
use slog::{crit, debug, error, trace, warn};
use std::collections::HashMap;
use std::sync::Arc;
use tokio::sync::mpsc;
use types::{Epoch, EthSpec, SignedBeaconBlock, Slot};
use types::{Epoch, EthSpec, Hash256, SignedBeaconBlock, Slot};
/// For how long we store failed finalized chains to prevent retries.
const FAILED_CHAINS_EXPIRY_SECONDS: u64 = 30;
/// The primary object dealing with long range/batch syncing. This contains all the active and
/// non-active chains that need to be processed before the syncing is considered complete. This
@@ -69,6 +74,8 @@ pub struct RangeSync<T: BeaconChainTypes, C = BeaconChain<T>> {
/// A collection of chains that need to be downloaded. This stores any head or finalized chains
/// that need to be downloaded.
chains: ChainCollection<T, C>,
/// Chains that have failed and are stored to prevent being retried.
failed_chains: LRUTimeCache<Hash256>,
/// A multi-threaded, non-blocking processor for applying messages to the beacon chain.
beacon_processor_send: mpsc::Sender<BeaconWorkEvent<T>>,
/// The syncing logger.
@@ -88,6 +95,9 @@ where
RangeSync {
beacon_chain: beacon_chain.clone(),
chains: ChainCollection::new(beacon_chain, log.clone()),
failed_chains: LRUTimeCache::new(std::time::Duration::from_secs(
FAILED_CHAINS_EXPIRY_SECONDS,
)),
awaiting_head_peers: HashMap::new(),
beacon_processor_send,
log,
@@ -128,6 +138,14 @@ where
// determine which kind of sync to perform and set up the chains
match RangeSyncType::new(self.beacon_chain.as_ref(), &local_info, &remote_info) {
RangeSyncType::Finalized => {
// Make sure we have not recently tried this chain
if self.failed_chains.contains(&remote_info.finalized_root) {
debug!(self.log, "Disconnecting peer that belongs to previously failed chain";
"failed_root" => %remote_info.finalized_root, "peer_id" => %peer_id);
network.goodbye_peer(peer_id, GoodbyeReason::IrrelevantNetwork);
return;
}
// Finalized chain search
debug!(self.log, "Finalization sync peer joined"; "peer_id" => %peer_id);
self.awaiting_head_peers.remove(&peer_id);
@@ -338,6 +356,13 @@ where
debug!(self.log, "Chain removed"; "sync_type" => ?sync_type, &chain, "reason" => ?remove_reason, "op" => op);
}
if let RemoveChain::ChainFailed(_) = remove_reason {
if RangeSyncType::Finalized == sync_type {
warn!(self.log, "Chain failed! Syncing to its head won't be retried for at least the next {} seconds", FAILED_CHAINS_EXPIRY_SECONDS; &chain);
self.failed_chains.insert(chain.target_head_root);
}
}
network.status_peers(self.beacon_chain.as_ref(), chain.peers());
let local = match self.beacon_chain.status_message() {