Add option to disable background_reconcile for storage controller

storage_controller/src/main.rs

@@ -75,6 +75,10 @@ struct Cli {
     #[arg(long)]
     reconciler_concurrency: Option<usize>,
 
+    /// Whether to spawn a background reconciliation task (enabled by default)
+    #[arg(long)]
+    background_reconcile: Option<bool>,
+
     /// How long to wait for the initial database connection to be available.
     #[arg(long, default_value = "5s")]
     db_connect_timeout: humantime::Duration,
@@ -266,6 +270,7 @@ async fn async_main() -> anyhow::Result<()> {
         reconciler_concurrency: args
             .reconciler_concurrency
             .unwrap_or(RECONCILER_CONCURRENCY_DEFAULT),
+        background_reconcile: args.background_reconcile.unwrap_or(true),
         split_threshold: args.split_threshold,
         neon_local_repo_dir: args.neon_local_repo_dir,
     };

storage_controller/src/service.rs

@@ -240,6 +240,8 @@ pub struct Config {
     /// How many Reconcilers may be spawned concurrently
     pub reconciler_concurrency: usize,
 
+    pub background_reconcile: bool,
+
     /// How large must a shard grow in bytes before we split it?
     /// None disables auto-splitting.
     pub split_threshold: Option<u64>,
@@ -1229,14 +1231,16 @@ impl Service {
             }
         });
 
-        tokio::task::spawn({
-            let this = this.clone();
-            let startup_complete = startup_complete.clone();
-            async move {
-                startup_complete.wait().await;
-                this.background_reconcile().await;
-            }
-        });
+        if config.background_reconcile {
+            tokio::task::spawn({
+                let this = this.clone();
+                let startup_complete = startup_complete.clone();
+                async move {
+                    startup_complete.wait().await;
+                    this.background_reconcile().await;
+                }
+            });
+        }
 
         tokio::task::spawn({
             let this = this.clone();