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Better concurrency:

Browse source 
Use Notify instead of stupid sleep in background worker
Use Semaphore to limit concurrent requests in rpc_client
Make more background tasks cancellable
This commit is contained in:
Alex Auvolat 2020-04-22 16:51:52 +00:00
parent c0335ac690
commit e8214cb180
10 changed files with 153 additions and 120 deletions
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171
Cargo.lock generated
View file

@ -10,7 +10,7 @@ dependencies = [
[[package]]
name = "arc-swap"
version = "0.4.5"
version = "0.4.6"
source = "registry+https://github.com/rust-lang/crates.io-index"
[[package]]
@ -28,8 +28,8 @@ name = "atty"
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@ -98,7 +98,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
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@ -178,10 +178,10 @@ dependencies = [
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@ -204,7 +204,7 @@ name = "fs2"
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@ -316,17 +316,17 @@ dependencies = [
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@ -338,8 +338,8 @@ dependencies = [
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@ -358,7 +358,7 @@ name = "gethostname"
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@ -386,7 +386,7 @@ dependencies = [
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@ -400,10 +400,10 @@ dependencies = [
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@ -445,7 +445,7 @@ dependencies = [
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@ -494,7 +494,7 @@ name = "iovec"
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@ -526,12 +526,12 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
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@ -573,7 +573,7 @@ dependencies = [
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@ -587,7 +587,7 @@ version = "0.6.7"
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@ -608,7 +608,7 @@ version = "0.2.33"
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@ -700,10 +700,10 @@ dependencies = [
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@ -712,7 +712,7 @@ dependencies = [
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9
src/background.rs
View file

@ -3,9 +3,8 @@ use std::pin::Pin;
use futures::future::join_all;
use std::sync::Arc;
use std::time::Duration;
use tokio::sync::Mutex;
use tokio::sync::{mpsc, watch};
use tokio::sync::{mpsc, watch, Notify};
use crate::error::Error;
@ -18,6 +17,7 @@ pub struct BackgroundRunner {
queue_in: mpsc::UnboundedSender<(Job, bool)>,
queue_out: Mutex<mpsc::UnboundedReceiver<(Job, bool)>>,
job_notify: Notify,
workers: Mutex<Vec<tokio::task::JoinHandle<()>>>,
}
@ -30,6 +30,7 @@ impl BackgroundRunner {
stop_signal,
queue_in,
queue_out: Mutex::new(queue_out),
job_notify: Notify::new(),
workers: Mutex::new(Vec::new()),
})
}
@ -58,6 +59,7 @@ impl BackgroundRunner {
{
let boxed: Job = Box::pin(job);
let _: Result<_, _> = self.queue_in.clone().send((boxed, false));
self.job_notify.notify();
}
pub fn spawn_cancellable<T>(&self, job: T)
@ -66,6 +68,7 @@ impl BackgroundRunner {
{
let boxed: Job = Box::pin(job);
let _: Result<_, _> = self.queue_in.clone().send((boxed, true));
self.job_notify.notify();
}
pub async fn spawn_worker<F, T>(&self, name: String, worker: F)
@ -97,7 +100,7 @@ impl BackgroundRunner {
info!("Background runner {} exiting", i);
return;
}
tokio::time::delay_for(Duration::from_secs(1)).await;
self.job_notify.notified().await;
}
}
}

2
src/main.rs
View file

@ -238,7 +238,7 @@ async fn main() {
};
let rpc_http_cli =
Arc::new(RpcHttpClient::new(&tls_config).expect("Could not create RPC client"));
Arc::new(RpcHttpClient::new(8, &tls_config).expect("Could not create RPC client"));
let membership_rpc_cli =
RpcAddrClient::new(rpc_http_cli.clone(), MEMBERSHIP_RPC_PATH.to_string());
let admin_rpc_cli = RpcAddrClient::new(rpc_http_cli.clone(), ADMIN_RPC_PATH.to_string());

6
src/membership.rs
View file

@ -296,8 +296,10 @@ impl System {
ring.rebuild_ring();
let (update_ring, ring) = watch::channel(Arc::new(ring));
let rpc_http_client =
Arc::new(RpcHttpClient::new(&config.rpc_tls).expect("Could not create RPC client"));
let rpc_http_client = Arc::new(
RpcHttpClient::new(config.max_concurrent_requests, &config.rpc_tls)
.expect("Could not create RPC client"),
);
let rpc_path = MEMBERSHIP_RPC_PATH.to_string();
let rpc_client = RpcClient::new(

54
src/rpc_client.rs
View file

@ -10,7 +10,7 @@ use futures::stream::StreamExt;
use futures_util::future::FutureExt;
use hyper::client::{Client, HttpConnector};
use hyper::{Body, Method, Request};
use tokio::sync::watch;
use tokio::sync::{watch, Semaphore};
use crate::background::BackgroundRunner;
use crate::data::*;
@ -117,7 +117,7 @@ impl<M: RpcMessage + 'static> RpcClient<M> {
if results.len() >= stop_after {
// Continue requests in background
// TODO: make this optionnal (only usefull for write requests)
self.clone().background.spawn(async move {
self.clone().background.spawn_cancellable(async move {
resp_stream.collect::<Vec<_>>().await;
Ok(())
});
@ -164,14 +164,22 @@ impl<M: RpcMessage> RpcAddrClient<M> {
}
}
pub enum RpcHttpClient {
pub struct RpcHttpClient {
request_limiter: Semaphore,
method: ClientMethod,
}
enum ClientMethod {
HTTP(Client<HttpConnector, hyper::Body>),
HTTPS(Client<tls_util::HttpsConnectorFixedDnsname<HttpConnector>, hyper::Body>),
}
impl RpcHttpClient {
pub fn new(tls_config: &Option<TlsConfig>) -> Result<Self, Error> {
if let Some(cf) = tls_config {
pub fn new(
max_concurrent_requests: usize,
tls_config: &Option<TlsConfig>,
) -> Result<Self, Error> {
let method = if let Some(cf) = tls_config {
let ca_certs = tls_util::load_certs(&cf.ca_cert)?;
let node_certs = tls_util::load_certs(&cf.node_cert)?;
let node_key = tls_util::load_private_key(&cf.node_key)?;
@ -187,10 +195,14 @@ impl RpcHttpClient {
let connector =
tls_util::HttpsConnectorFixedDnsname::<HttpConnector>::new(config, "garage");
Ok(RpcHttpClient::HTTPS(Client::builder().build(connector)))
ClientMethod::HTTPS(Client::builder().build(connector))
} else {
Ok(RpcHttpClient::HTTP(Client::new()))
}
ClientMethod::HTTP(Client::new())
};
Ok(RpcHttpClient {
method,
request_limiter: Semaphore::new(max_concurrent_requests),
})
}
async fn call<M, MB>(
@ -204,9 +216,9 @@ impl RpcHttpClient {
MB: Borrow<M>,
M: RpcMessage,
{
let uri = match self {
RpcHttpClient::HTTP(_) => format!("http://{}/{}", to_addr, path),
RpcHttpClient::HTTPS(_) => format!("https://{}/{}", to_addr, path),
let uri = match self.method {
ClientMethod::HTTP(_) => format!("http://{}/{}", to_addr, path),
ClientMethod::HTTPS(_) => format!("https://{}/{}", to_addr, path),
};
let req = Request::builder()
@ -214,12 +226,22 @@ impl RpcHttpClient {
.uri(uri)
.body(Body::from(rmp_to_vec_all_named(msg.borrow())?))?;
let resp_fut = match self {
RpcHttpClient::HTTP(client) => client.request(req).fuse(),
RpcHttpClient::HTTPS(client) => client.request(req).fuse(),
let resp_fut = match &self.method {
ClientMethod::HTTP(client) => client.request(req).fuse(),
ClientMethod::HTTPS(client) => client.request(req).fuse(),
};
let slot = self.request_limiter.acquire().await;
let resp = tokio::time::timeout(timeout, resp_fut)
.await?
.await
.map_err(|e| {
debug!(
"RPC timeout to {}: {}",
to_addr,
debug_serialize(msg.borrow())
);
e
})?
.map_err(|e| {
warn!(
"RPC HTTP client error when connecting to {}: {}",
@ -227,6 +249,7 @@ impl RpcHttpClient {
);
e
})?;
drop(slot);
let status = resp.status();
let body = hyper::body::to_bytes(resp.into_body()).await?;
@ -240,3 +263,4 @@ impl RpcHttpClient {
}
}
}

7
src/rpc_server.rs
View file

@ -52,9 +52,10 @@ where
Ok(resp) => {
let resp_bytes = rmp_to_vec_all_named::<Result<M, String>>(&Ok(resp))?;
trace!(
"]RPC:{},ok ({} ms)",
"]RPC:{},ok ({} ms), request: {}",
name,
(Instant::now() - begin_time).as_millis()
(Instant::now() - begin_time).as_millis(),
req_str,
);
Ok(Response::new(Body::from(resp_bytes)))
}
@ -68,7 +69,7 @@ where
name,
e,
(Instant::now() - begin_time).as_millis(),
req_str
req_str,
);
Ok(err_response)
}

6
src/server.rs
View file

@ -35,6 +35,9 @@ pub struct Config {
pub bootstrap_peers: Vec<SocketAddr>,
#[serde(default = "default_max_concurrent_requests")]
pub max_concurrent_requests: usize,
#[serde(default = "default_block_size")]
pub block_size: usize,
@ -50,6 +53,9 @@ pub struct Config {
pub rpc_tls: Option<TlsConfig>,
}
fn default_max_concurrent_requests() -> usize {
12
}
fn default_block_size() -> usize {
1048576
}

10
src/table.rs
View file

@ -269,7 +269,7 @@ where
let ent2 = ret_entry.clone();
self.system
.background
.spawn(async move { self2.repair_on_read(&who[..], ent2).await });
.spawn_cancellable(async move { self2.repair_on_read(&who[..], ent2).await });
}
}
Ok(ret)
@ -324,7 +324,7 @@ where
}
if !to_repair.is_empty() {
let self2 = self.clone();
self.system.background.spawn(async move {
self.system.background.spawn_cancellable(async move {
for (_, v) in to_repair.iter_mut() {
self2.repair_on_read(&who[..], v.take().unwrap()).await?;
}
@ -472,7 +472,7 @@ where
self.instance.updated(old_entry, Some(new_entry)).await?;
self.system
.background
.spawn(syncer.clone().invalidate(tree_key));
.spawn_cancellable(syncer.clone().invalidate(tree_key));
}
}
@ -480,7 +480,7 @@ where
let self2 = self.clone();
self.system
.background
.spawn(async move { self2.insert_many(&epidemic_propagate[..]).await });
.spawn_cancellable(async move { self2.insert_many(&epidemic_propagate[..]).await });
}
Ok(())
@ -500,7 +500,7 @@ where
self.instance.updated(Some(old_entry), None).await?;
self.system
.background
.spawn(syncer.clone().invalidate(key.to_vec()));
.spawn_cancellable(syncer.clone().invalidate(key.to_vec()));
count += 1;
}
}

3
src/table_sync.rs
View file

@ -132,10 +132,9 @@ where
.await;
let s3 = syncer.clone();
table.system.background.spawn(async move {
tokio::spawn(async move {
tokio::time::delay_for(Duration::from_secs(20)).await;
s3.add_full_scan().await;
Ok(())
});
syncer

5
test_write.sh
View file

@ -1,8 +1,7 @@
#!/bin/bash
for FILE in $(find target/debug/deps); do
echo
echo $FILE
curl -v localhost:3900/$FILE -X PUT -H 'Host: garage' -H 'Content-Type: application/blob' --data-binary "@$FILE"
echo -n "$FILE "
curl localhost:3900/$FILE -X PUT -H 'Host: garage' -H 'Content-Type: application/blob' --data-binary "@$FILE" || echo "ERROR"
done