refactor(frontend): make frontend compute runtime configurable

src/common/src/config.rs

@@ -451,6 +451,10 @@ pub struct BatchConfig {
 
     #[serde(default, flatten)]
     pub unrecognized: Unrecognized<Self>,
+
+    #[serde(default = "default::batch::frontend_compute_runtime_worker_threads")]
+    /// frontend compute runtime worker threads
+    pub frontend_compute_runtime_worker_threads: usize,
 }
 
 /// The section `[streaming]` in `risingwave.toml`.
@@ -1426,6 +1430,10 @@ pub mod default {
             // 1 hour
             60 * 60
         }
+
+        pub fn frontend_compute_runtime_worker_threads() -> usize {
+            4
+        }
     }
 
     pub mod compaction_config {

src/config/example.toml

@@ -73,6 +73,7 @@ meta_cached_traces_memory_limit_bytes = 134217728
 [batch]
 enable_barrier_read = false
 statement_timeout_in_sec = 3600
+frontend_compute_runtime_worker_threads = 4
 
 [batch.developer]
 batch_connector_message_buffer_size = 16

src/frontend/src/session.rs

@@ -167,6 +167,18 @@ impl FrontendEnv {
         let server_addr = HostAddr::try_from("127.0.0.1:4565").unwrap();
         let client_pool = Arc::new(ComputeClientPool::default());
         let creating_streaming_tracker = StreamingJobTracker::new(meta_client.clone());
+        let compute_runtime = Arc::new(BackgroundShutdownRuntime::from(
+            Builder::new_multi_thread()
+                .worker_threads(
+                    load_config("", FrontendOpts::default())
+                        .batch
+                        .frontend_compute_runtime_worker_threads,
+                )
+                .thread_name("rw-batch-local")
+                .enable_all()
+                .build()
+                .unwrap(),
+        ));
         Self {
             meta_client,
             catalog_writer,
@@ -184,7 +196,7 @@ impl FrontendEnv {
             meta_config: MetaConfig::default(),
             source_metrics: Arc::new(SourceMetrics::default()),
             creating_streaming_job_tracker: Arc::new(creating_streaming_tracker),
-            compute_runtime: Self::create_compute_runtime(),
+            compute_runtime,
         }
     }
 
@@ -325,6 +337,15 @@ impl FrontendEnv {
         let creating_streaming_job_tracker =
             Arc::new(StreamingJobTracker::new(frontend_meta_client.clone()));
 
+        let compute_runtime = Arc::new(BackgroundShutdownRuntime::from(
+            Builder::new_multi_thread()
+                .worker_threads(batch_config.frontend_compute_runtime_worker_threads)
+                .thread_name("rw-batch-local")
+                .enable_all()
+                .build()
+                .unwrap(),
+        ));
+
         Ok((
             Self {
                 catalog_reader,
@@ -343,7 +364,7 @@ impl FrontendEnv {
                 meta_config,
                 source_metrics,
                 creating_streaming_job_tracker,
-                compute_runtime: Self::create_compute_runtime(),
+                compute_runtime,
             },
             join_handles,
             shutdown_senders,
@@ -432,17 +453,6 @@ impl FrontendEnv {
         self.compute_runtime.clone()
     }
 
-    fn create_compute_runtime() -> Arc<BackgroundShutdownRuntime> {
-        Arc::new(BackgroundShutdownRuntime::from(
-            Builder::new_multi_thread()
-                .worker_threads(4)
-                .thread_name("rw-batch-local")
-                .enable_all()
-                .build()
-                .unwrap(),
-        ))
-    }
-
     /// Cancel queries (i.e. batch queries) in session.
     /// If the session exists return true, otherwise, return false.
     pub fn cancel_queries_in_session(&self, session_id: SessionId) -> bool {