fix: fix todo & corner case for scaling in sql backend

src/meta/src/barrier/recovery.rs

@@ -368,15 +368,11 @@ impl GlobalBarrierManagerContext {
                     // Resolve actor info for recovery. If there's no actor to recover, most of the
                     // following steps will be no-op, while the compute nodes will still be reset.
                     let mut info = if !self.env.opts.disable_automatic_parallelism_control {
-                        let info = self.resolve_actor_info().await;
-                        let scaled = self.scale_actors(&info).await.inspect_err(|err| {
+                        self.scale_actors().await.inspect_err(|err| {
                             warn!(error = %err.as_report(), "scale actors failed");
                         })?;
-                        if scaled {
-                            self.resolve_actor_info().await
-                        } else {
-                            info
-                        }
+
+                        self.resolve_actor_info().await
                     } else {
                         // Migrate actors in expired CN to newly joined one.
                         self.migrate_actors().await.inspect_err(|err| {
@@ -596,14 +592,14 @@ impl GlobalBarrierManagerContext {
         Ok(info)
     }
 
-    async fn scale_actors(&self, info: &InflightActorInfo) -> MetaResult<bool> {
+    async fn scale_actors(&self) -> MetaResult<()> {
         match &self.metadata_manager {
-            MetadataManager::V1(_) => self.scale_actors_v1(info).await,
-            MetadataManager::V2(_) => self.scale_actors_v2(info).await,
+            MetadataManager::V1(_) => self.scale_actors_v1().await,
+            MetadataManager::V2(_) => self.scale_actors_v2().await,
         }
     }
 
-    async fn scale_actors_v2(&self, _info: &InflightActorInfo) -> MetaResult<bool> {
+    async fn scale_actors_v2(&self) -> MetaResult<()> {
         let mgr = self.metadata_manager.as_v2_ref();
         debug!("start resetting actors distribution");
 
@@ -690,16 +686,18 @@ impl GlobalBarrierManagerContext {
         }
 
         debug!("scaling-in actors succeed.");
-        Ok(true)
+        Ok(())
     }
 
-    async fn scale_actors_v1(&self, info: &InflightActorInfo) -> MetaResult<bool> {
+    async fn scale_actors_v1(&self) -> MetaResult<()> {
+        let info = self.resolve_actor_info().await;
+
         let mgr = self.metadata_manager.as_v1_ref();
         debug!("start resetting actors distribution");
 
         if info.actor_location_map.is_empty() {
             debug!("empty cluster, skipping");
-            return Ok(true);
+            return Ok(());
         }
 
         let current_parallelism = info
@@ -821,7 +819,7 @@ impl GlobalBarrierManagerContext {
         }
 
         debug!("scaling-in actors succeed.");
-        Ok(true)
+        Ok(())
     }
 
     /// This function will generate a migration plan, which includes the mapping for all expired and

src/meta/src/controller/cluster.rs

@@ -109,7 +109,11 @@ impl ClusterController {
         let meta_store = env
             .sql_meta_store()
             .expect("sql meta store is not initialized");
-        let inner = ClusterControllerInner::new(meta_store.conn).await?;
+        let inner = ClusterControllerInner::new(
+            meta_store.conn,
+            env.opts.disable_automatic_parallelism_control,
+        )
+        .await?;
         Ok(Self {
             env,
             max_heartbeat_interval,
@@ -460,13 +464,17 @@ pub struct ClusterControllerInner {
     /// Record for tracking available machine ids, one is available.
     available_transactional_ids: VecDeque<TransactionId>,
     worker_extra_info: HashMap<WorkerId, WorkerExtraInfo>,
+    disable_automatic_parallelism_control: bool,
 }
 
 impl ClusterControllerInner {
     pub const MAX_WORKER_REUSABLE_ID_BITS: usize = 10;
     pub const MAX_WORKER_REUSABLE_ID_COUNT: usize = 1 << Self::MAX_WORKER_REUSABLE_ID_BITS;
 
-    pub async fn new(db: DatabaseConnection) -> MetaResult<Self> {
+    pub async fn new(
+        db: DatabaseConnection,
+        disable_automatic_parallelism_control: bool,
+    ) -> MetaResult<Self> {
         let workers: Vec<(WorkerId, Option<TransactionId>)> = Worker::find()
             .select_only()
             .column(worker::Column::WorkerId)
@@ -492,6 +500,7 @@ impl ClusterControllerInner {
             db,
             available_transactional_ids,
             worker_extra_info,
+            disable_automatic_parallelism_control,
         })
     }
 
@@ -598,14 +607,25 @@ impl ClusterControllerInner {
 
                 match new_parallelism.cmp(&current_parallelism.len()) {
                     Ordering::Less => {
-                        // Warn and keep the original parallelism if the worker registered with a
-                        // smaller parallelism.
-                        tracing::warn!(
-                            "worker {} parallelism is less than current, current is {}, but received {}",
-                            worker.worker_id,
-                            current_parallelism.len(),
-                            new_parallelism
-                        );
+                        if !self.disable_automatic_parallelism_control {
+                            // Handing over to the subsequent recovery loop for a forced reschedule.
+                            tracing::info!(
+                                "worker {} parallelism reduced from {} to {}",
+                                worker.worker_id,
+                                current_parallelism.len(),
+                                new_parallelism
+                            );
+                            current_parallelism.truncate(new_parallelism);
+                        } else {
+                            // Warn and keep the original parallelism if the worker registered with a
+                            // smaller parallelism.
+                            tracing::warn!(
+                                "worker {} parallelism is less than current, current is {}, but received {}",
+                                worker.worker_id,
+                                current_parallelism.len(),
+                                new_parallelism
+                            );
+                        }
                     }
                     Ordering::Greater => {
                         tracing::info!(

src/meta/src/controller/fragment.rs

@@ -24,7 +24,7 @@ use risingwave_meta_model_v2::prelude::{Actor, ActorDispatcher, Fragment, Sink,
 use risingwave_meta_model_v2::{
     actor, actor_dispatcher, fragment, object, sink, streaming_job, ActorId, ConnectorSplits,
     ExprContext, FragmentId, FragmentVnodeMapping, I32Array, JobStatus, ObjectId, SinkId, SourceId,
-    StreamNode, TableId, VnodeBitmap, WorkerId,
+    StreamNode, StreamingParallelism, TableId, VnodeBitmap, WorkerId,
 };
 use risingwave_pb::common::PbParallelUnit;
 use risingwave_pb::meta::subscribe_response::{
@@ -54,6 +54,7 @@ use crate::controller::utils::{
     PartialActorLocation, PartialFragmentStateTables,
 };
 use crate::manager::{ActorInfos, LocalNotification};
+use crate::model::TableParallelism;
 use crate::stream::SplitAssignment;
 use crate::{MetaError, MetaResult};
 
@@ -311,6 +312,7 @@ impl CatalogController {
             HashMap<ActorId, Vec<actor_dispatcher::Model>>,
         )>,
         parallel_units_map: &HashMap<u32, PbParallelUnit>,
+        parallelism: StreamingParallelism,
     ) -> MetaResult<PbTableFragments> {
         let mut pb_fragments = HashMap::new();
         let mut pb_actor_splits = HashMap::new();
@@ -333,8 +335,13 @@ impl CatalogController {
             actor_status: pb_actor_status,
             actor_splits: pb_actor_splits,
             ctx: Some(ctx.unwrap_or_default()),
-            // TODO(peng): fix this for model v2
-            parallelism: None,
+            parallelism: Some(
+                match parallelism {
+                    StreamingParallelism::Adaptive => TableParallelism::Adaptive,
+                    StreamingParallelism::Fixed(n) => TableParallelism::Fixed(n as _),
+                }
+                .into(),
+            ),
         };
 
         Ok(table_fragments)
@@ -631,6 +638,7 @@ impl CatalogController {
             job_info.timezone.map(|tz| PbStreamContext { timezone: tz }),
             fragment_info,
             &parallel_units_map,
+            job_info.parallelism.clone(),
         )
     }
 
@@ -733,6 +741,7 @@ impl CatalogController {
                     job.timezone.map(|tz| PbStreamContext { timezone: tz }),
                     fragment_info,
                     &parallel_units_map,
+                    job.parallelism.clone(),
                 )?,
             );
         }

src/meta/src/stream/scale.rs

@@ -30,6 +30,7 @@ use risingwave_common::buffer::{Bitmap, BitmapBuilder};
 use risingwave_common::catalog::TableId;
 use risingwave_common::hash::{ActorMapping, ParallelUnitId, VirtualNode};
 use risingwave_common::util::iter_util::ZipEqDebug;
+use risingwave_meta_model_v2::StreamingParallelism;
 use risingwave_pb::common::{ActorInfo, ParallelUnit, WorkerNode};
 use risingwave_pb::meta::get_reschedule_plan_request::{Policy, StableResizePolicy};
 use risingwave_pb::meta::subscribe_response::{Info, Operation};
@@ -1365,9 +1366,6 @@ impl ScaleController {
             }
 
             for created_parallel_unit_id in added_parallel_units {
-                // self.env.sql_id_gen_manager_ref().map(|id_gen| id_gen.actors.generate_interval(1))
-                //
-
                 let id = match self.env.sql_id_gen_manager_ref() {
                     None => {
                         self.env
@@ -2488,8 +2486,64 @@ impl GlobalStreamManager {
                 )
                 .await?;
             }
-            MetadataManager::V2(_mgr) => {
-                todo!()
+            MetadataManager::V2(mgr) => {
+                let table_parallelisms: HashMap<_, _> = {
+                    let streaming_parallelisms = mgr
+                        .catalog_controller
+                        .get_all_streaming_parallelisms()
+                        .await?;
+
+                    streaming_parallelisms
+                        .into_iter()
+                        .map(|(table_id, parallelism)| {
+                            // no custom for sql backend
+                            let table_parallelism = match parallelism {
+                                StreamingParallelism::Adaptive => TableParallelism::Adaptive,
+                                StreamingParallelism::Fixed(n) => TableParallelism::Fixed(n),
+                            };
+
+                            (table_id as u32, table_parallelism)
+                        })
+                        .collect()
+                };
+
+                let workers = mgr
+                    .cluster_controller
+                    .list_active_streaming_workers()
+                    .await?;
+
+                let schedulable_worker_ids = workers
+                    .iter()
+                    .filter(|worker| {
+                        !worker
+                            .property
+                            .as_ref()
+                            .map(|p| p.is_unschedulable)
+                            .unwrap_or(false)
+                    })
+                    .map(|worker| worker.id)
+                    .collect();
+
+                let reschedules = self
+                    .scale_controller
+                    .generate_table_resize_plan(TableResizePolicy {
+                        worker_ids: schedulable_worker_ids,
+                        table_parallelisms: table_parallelisms.clone(),
+                    })
+                    .await?;
+
+                if reschedules.is_empty() {
+                    return Ok(());
+                }
+
+                self.reschedule_actors(
+                    reschedules,
+                    RescheduleOptions {
+                        resolve_no_shuffle_upstream: true,
+                    },
+                    None,
+                )
+                .await?;
             }
         }