From e935861854deed5d1ca66767fc51d9849201a4dd Mon Sep 17 00:00:00 2001 From: Alex Auvolat Date: Mon, 25 Jul 2022 18:19:35 +0200 Subject: Factor out node request order selection logic & use in manager --- Cargo.lock | 2 +- script/dev-cluster.sh | 2 +- src/block/manager.rs | 2 ++ src/rpc/rpc_helper.rs | 95 ++++++++++++++++++++++++++++++--------------------- 4 files changed, 60 insertions(+), 41 deletions(-) diff --git a/Cargo.lock b/Cargo.lock index 0d00bca1..e3d8373f 100644 --- a/Cargo.lock +++ b/Cargo.lock @@ -2158,7 +2158,7 @@ dependencies = [ [[package]] name = "netapp" version = "0.5.0" -source = "git+https://git.deuxfleurs.fr/lx/netapp?branch=stream-body#fed0542313824df295a7e322a9aebe8ba62f97b9" +source = "git+https://git.deuxfleurs.fr/lx/netapp?branch=stream-body#74e57016f63b6052cf6d539812859c3a46138eee" dependencies = [ "arc-swap", "async-trait", diff --git a/script/dev-cluster.sh b/script/dev-cluster.sh index fa0a950e..c7fbe08d 100755 --- a/script/dev-cluster.sh +++ b/script/dev-cluster.sh @@ -11,7 +11,7 @@ PATH="${GARAGE_DEBUG}:${GARAGE_RELEASE}:${NIX_RELEASE}:$PATH" FANCYCOLORS=("41m" "42m" "44m" "45m" "100m" "104m") export RUST_BACKTRACE=1 -export RUST_LOG=garage=info,garage_api=debug +export RUST_LOG=garage=info,garage_api=debug,netapp=trace MAIN_LABEL="\e[${FANCYCOLORS[0]}[main]\e[49m" WHICH_GARAGE=$(which garage || exit 1) diff --git a/src/block/manager.rs b/src/block/manager.rs index bb01c300..80c52510 100644 --- a/src/block/manager.rs +++ b/src/block/manager.rs @@ -185,6 +185,7 @@ impl BlockManager { hash: &Hash, ) -> Result<(DataBlockHeader, ByteStream), Error> { let who = self.replication.read_nodes(hash); + //let who = self.system.rpc.request_order(&who); for node in who.iter() { let node_id = NodeID::from(*node); @@ -225,6 +226,7 @@ impl BlockManager { /// Return its entire body async fn rpc_get_raw_block(&self, hash: &Hash) -> Result { let who = self.replication.read_nodes(hash); + //let who = self.system.rpc.request_order(&who); for node in who.iter() { let node_id = NodeID::from(*node); diff --git a/src/rpc/rpc_helper.rs b/src/rpc/rpc_helper.rs index 6e098446..ddabd636 100644 --- a/src/rpc/rpc_helper.rs +++ b/src/rpc/rpc_helper.rs @@ -292,47 +292,19 @@ impl RpcHelper { // to reach a quorum, priorizing nodes with the lowest latency. // When there are errors, we start new requests to compensate. - // Retrieve some status variables that we will use to sort requests - let peer_list = self.0.fullmesh.get_peer_list(); - let ring: Arc = self.0.ring.borrow().clone(); - let our_zone = match ring.layout.node_role(&self.0.our_node_id) { - Some(pc) => &pc.zone, - None => "", - }; - - // Augment requests with some information used to sort them. - // The tuples are as follows: - // (is another node?, is another zone?, latency, node ID, request future) - // We store all of these tuples in a vec that we can sort. - // By sorting this vec, we priorize ourself, then nodes in the same zone, - // and within a same zone we priorize nodes with the lowest latency. - let mut requests = requests - .map(|(to, fut)| { - let peer_zone = match ring.layout.node_role(&to) { - Some(pc) => &pc.zone, - None => "", - }; - let peer_avg_ping = peer_list - .iter() - .find(|x| x.id.as_ref() == to.as_slice()) - .and_then(|pi| pi.avg_ping) - .unwrap_or_else(|| Duration::from_secs(1)); - ( - to != self.0.our_node_id, - peer_zone != our_zone, - peer_avg_ping, - to, - fut, - ) - }) + // Reorder requests to priorize closeness / low latency + let request_order = self.request_order(to); + let mut ord_requests = vec![(); request_order.len()] + .into_iter() + .map(|_| None) .collect::>(); - - // Sort requests by (priorize ourself, priorize same zone, priorize low latency) - requests - .sort_by_key(|(diffnode, diffzone, ping, _to, _fut)| (*diffnode, *diffzone, *ping)); + for (to, fut) in requests { + let i = request_order.iter().position(|x| *x == to).unwrap(); + ord_requests[i] = Some((to, fut)); + } // Make an iterator to take requests in their sorted order - let mut requests = requests.into_iter(); + let mut requests = ord_requests.into_iter().map(Option::unwrap); // resp_stream will contain all of the requests that are currently in flight. // (for the moment none, they will be added in the loop below) @@ -343,7 +315,7 @@ impl RpcHelper { // If the current set of requests that are running is not enough to possibly // reach quorum, start some new requests. while successes.len() + resp_stream.len() < quorum { - if let Some((_, _, _, req_to, fut)) = requests.next() { + if let Some((req_to, fut)) = requests.next() { let tracer = opentelemetry::global::tracer("garage"); let span = tracer.start(format!("RPC to {:?}", req_to)); resp_stream.push(tokio::spawn( @@ -413,4 +385,49 @@ impl RpcHelper { Err(Error::Quorum(quorum, successes.len(), to.len(), errors)) } } + + pub fn request_order(&self, nodes: &[Uuid]) -> Vec { + // Retrieve some status variables that we will use to sort requests + let peer_list = self.0.fullmesh.get_peer_list(); + let ring: Arc = self.0.ring.borrow().clone(); + let our_zone = match ring.layout.node_role(&self.0.our_node_id) { + Some(pc) => &pc.zone, + None => "", + }; + + // Augment requests with some information used to sort them. + // The tuples are as follows: + // (is another node?, is another zone?, latency, node ID, request future) + // We store all of these tuples in a vec that we can sort. + // By sorting this vec, we priorize ourself, then nodes in the same zone, + // and within a same zone we priorize nodes with the lowest latency. + let mut nodes = nodes + .iter() + .map(|to| { + let peer_zone = match ring.layout.node_role(&to) { + Some(pc) => &pc.zone, + None => "", + }; + let peer_avg_ping = peer_list + .iter() + .find(|x| x.id.as_ref() == to.as_slice()) + .and_then(|pi| pi.avg_ping) + .unwrap_or_else(|| Duration::from_secs(1)); + ( + *to != self.0.our_node_id, + peer_zone != our_zone, + peer_avg_ping, + *to, + ) + }) + .collect::>(); + + // Sort requests by (priorize ourself, priorize same zone, priorize low latency) + nodes.sort_by_key(|(diffnode, diffzone, ping, _to)| (*diffnode, *diffzone, *ping)); + + nodes + .into_iter() + .map(|(_, _, _, to)| to) + .collect::>() + } } -- cgit v1.2.3