From d56c472712df7c064387429a5af73d3bc0eb438d Mon Sep 17 00:00:00 2001
From: Alex Auvolat <alex@adnab.me>
Date: Wed, 14 Dec 2022 12:51:16 +0100
Subject: Refactor background runner and get rid of job worker

---
 src/rpc/rpc_helper.rs | 18 +++++-------------
 1 file changed, 5 insertions(+), 13 deletions(-)

(limited to 'src/rpc/rpc_helper.rs')

diff --git a/src/rpc/rpc_helper.rs b/src/rpc/rpc_helper.rs
index 949aced6..1ec250c3 100644
--- a/src/rpc/rpc_helper.rs
+++ b/src/rpc/rpc_helper.rs
@@ -5,7 +5,6 @@ use std::time::Duration;
 use futures::future::join_all;
 use futures::stream::futures_unordered::FuturesUnordered;
 use futures::stream::StreamExt;
-use futures_util::future::FutureExt;
 use tokio::select;
 use tokio::sync::watch;
 
@@ -24,7 +23,6 @@ pub use netapp::message::{
 use netapp::peering::fullmesh::FullMeshPeeringStrategy;
 pub use netapp::{self, NetApp, NodeID};
 
-use garage_util::background::BackgroundRunner;
 use garage_util::data::*;
 use garage_util::error::Error;
 use garage_util::metrics::RecordDuration;
@@ -94,7 +92,6 @@ pub struct RpcHelper(Arc<RpcHelperInner>);
 struct RpcHelperInner {
 	our_node_id: Uuid,
 	fullmesh: Arc<FullMeshPeeringStrategy>,
-	background: Arc<BackgroundRunner>,
 	ring: watch::Receiver<Arc<Ring>>,
 	metrics: RpcMetrics,
 	rpc_timeout: Duration,
@@ -104,7 +101,6 @@ impl RpcHelper {
 	pub(crate) fn new(
 		our_node_id: Uuid,
 		fullmesh: Arc<FullMeshPeeringStrategy>,
-		background: Arc<BackgroundRunner>,
 		ring: watch::Receiver<Arc<Ring>>,
 		rpc_timeout: Option<Duration>,
 	) -> Self {
@@ -113,7 +109,6 @@ impl RpcHelper {
 		Self(Arc::new(RpcHelperInner {
 			our_node_id,
 			fullmesh,
-			background,
 			ring,
 			metrics,
 			rpc_timeout: rpc_timeout.unwrap_or(DEFAULT_TIMEOUT),
@@ -377,16 +372,13 @@ impl RpcHelper {
 
 			if !resp_stream.is_empty() {
 				// Continue remaining requests in background.
-				// Continue the remaining requests immediately using tokio::spawn
-				// but enqueue a task in the background runner
-				// to ensure that the process won't exit until the requests are done
-				// (if we had just enqueued the resp_stream.collect directly in the background runner,
-				// the requests might have been put on hold in the background runner's queue,
-				// in which case they might timeout or otherwise fail)
-				let wait_finished_fut = tokio::spawn(async move {
+				// Note: these requests can get interrupted on process shutdown,
+				// we must not count on them being executed for certain.
+				// For all background things that have to happen with certainty,
+				// they have to be put in a proper queue that is persisted to disk.
+				tokio::spawn(async move {
 					resp_stream.collect::<Vec<Result<_, _>>>().await;
 				});
-				self.0.background.spawn(wait_finished_fut.map(|_| Ok(())));
 			}
 		}
 
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