Companion PR for adding max notification sizes (#2287)

* Companion PR for adding max notification sizes

* Add TODO

* Missing ;

* =>

* Common limit

* "Update Substrate"

Co-authored-by: parity-processbot <>

polkadot/node/network/protocol/src/peer_set.rs

@@ -36,9 +36,14 @@ impl PeerSet {
 	/// network service.
 	pub fn get_info(self) -> NonDefaultSetConfig {
 		let protocol = self.into_protocol_name();
+		// TODO: lower this limit after https://github.com/paritytech/polkadot/issues/2283 is
+		// done and collations use request-response protocols
+		let max_notification_size = 16 * 1024 * 1024;
+
 		match self {
 			PeerSet::Validation => NonDefaultSetConfig {
 				notifications_protocol: protocol,
+				max_notification_size,
 				set_config: sc_network::config::SetConfig {
 					in_peers: 25,
 					out_peers: 0,
@@ -48,6 +53,7 @@ impl PeerSet {
 			},
 			PeerSet::Collation => NonDefaultSetConfig {
 				notifications_protocol: protocol,
+				max_notification_size,
 				set_config: SetConfig {
 					in_peers: 25,
 					out_peers: 0,