deps: replace lru with schnellru (#1217)

* deps: replace lru with schnellru

* bring the peace to the galaxy

polkadot/node/service/Cargo.toml

@@ -86,7 +86,7 @@ parity-db = { version = "0.4.8", optional = true }
 codec = { package = "parity-scale-codec", version = "3.6.1" }
 
 async-trait = "0.1.57"
-lru = "0.11.0"
+schnellru = "0.2.1"
 log = "0.4.17"
 is_executable = "1.0.1"
 

polkadot/node/service/src/overseer.rs

@@ -19,7 +19,6 @@ use polkadot_node_subsystem_types::DefaultSubsystemClient;
 use sc_transaction_pool_api::OffchainTransactionPoolFactory;
 use sp_core::traits::SpawnNamed;
 
-use lru::LruCache;
 use polkadot_availability_distribution::IncomingRequestReceivers;
 use polkadot_node_core_approval_voting::Config as ApprovalVotingConfig;
 use polkadot_node_core_av_store::Config as AvailabilityConfig;
@@ -41,6 +40,7 @@ use polkadot_overseer::{
 	metrics::Metrics as OverseerMetrics, InitializedOverseerBuilder, MetricsTrait, Overseer,
 	OverseerConnector, OverseerHandle, SpawnGlue,
 };
+use schnellru::{ByLength, LruMap};
 
 use polkadot_primitives::runtime_api::ParachainHost;
 use sc_authority_discovery::Service as AuthorityDiscoveryService;
@@ -344,7 +344,7 @@ where
 		.span_per_active_leaf(Default::default())
 		.active_leaves(Default::default())
 		.supports_parachains(runtime_api_client)
-		.known_leaves(LruCache::new(KNOWN_LEAVES_CACHE_SIZE))
+		.known_leaves(LruMap::new(ByLength::new(KNOWN_LEAVES_CACHE_SIZE)))
 		.metrics(metrics)
 		.spawner(spawner);