diff --git a/src/common/src/hash/consistent_hash/mapping.rs b/src/common/src/hash/consistent_hash/mapping.rs
index 69a89e6fc4860..e51d1f12357df 100644
--- a/src/common/src/hash/consistent_hash/mapping.rs
+++ b/src/common/src/hash/consistent_hash/mapping.rs
@@ -361,29 +361,7 @@ impl ActorMapping {
     }
 }
 
-impl WorkerSlotMapping {
-    /// Create a uniform worker mapping from the given worker ids
-    pub fn build_from_ids(worker_slot_ids: &[WorkerSlotId]) -> Self {
-        Self::new_uniform(worker_slot_ids.iter().cloned())
-    }
-
-    /// Create a worker mapping from the protobuf representation.
-    pub fn from_protobuf(proto: &PbWorkerSlotMapping) -> Self {
-        assert_eq!(proto.original_indices.len(), proto.data.len());
-        Self {
-            original_indices: proto.original_indices.clone(),
-            data: proto.data.iter().map(|&id| WorkerSlotId(id)).collect(),
-        }
-    }
-
-    /// Convert this worker mapping to the protobuf representation.
-    pub fn to_protobuf(&self) -> PbWorkerSlotMapping {
-        PbWorkerSlotMapping {
-            original_indices: self.original_indices.clone(),
-            data: self.data.iter().map(|id| id.0).collect(),
-        }
-    }
-}
+impl WorkerSlotMapping {}
 
 impl ParallelUnitMapping {
     /// Create a uniform parallel unit mapping from the given parallel units, essentially
@@ -462,6 +440,23 @@ impl WorkerSlotMapping {
         //
         // self.transform(&map)
     }
+
+    /// Create a worker mapping from the protobuf representation.
+    pub fn from_protobuf(proto: &PbWorkerSlotMapping) -> Self {
+        assert_eq!(proto.original_indices.len(), proto.data.len());
+        Self {
+            original_indices: proto.original_indices.clone(),
+            data: proto.data.iter().map(|&id| WorkerSlotId(id)).collect(),
+        }
+    }
+
+    /// Convert this worker mapping to the protobuf representation.
+    pub fn to_protobuf(&self) -> PbWorkerSlotMapping {
+        PbWorkerSlotMapping {
+            original_indices: self.original_indices.clone(),
+            data: self.data.iter().map(|id| id.0).collect(),
+        }
+    }
 }
 
 #[cfg(test)]
diff --git a/src/meta/src/model/stream.rs b/src/meta/src/model/stream.rs
index 39395e02f1a23..33e7220b5897e 100644
--- a/src/meta/src/model/stream.rs
+++ b/src/meta/src/model/stream.rs
@@ -213,13 +213,15 @@ impl TableFragments {
     ) -> Self {
         let actor_status = actor_locations
             .iter()
-            .map(|(&actor_id, WorkerSlotId(worker_id, slot_id))| {
+            .map(|(&actor_id, worker_slot_id)| {
+                let worker_id = worker_slot_id.worker_id();
+                let slot_id = worker_slot_id.slot_idx();
                 (
                     actor_id,
                     ActorStatus {
                         parallel_unit: Some(ParallelUnit {
-                            id: *worker_id << 10 | *slot_id,
-                            worker_node_id: *worker_id,
+                            id: worker_id << 10 | slot_id,
+                            worker_node_id: worker_id,
                         }),
                         state: ActorState::Inactive as i32,
                     },
diff --git a/src/meta/src/stream/stream_graph/schedule.rs b/src/meta/src/stream/stream_graph/schedule.rs
index 9bec0d3978085..3b8e840d46aa7 100644
--- a/src/meta/src/stream/stream_graph/schedule.rs
+++ b/src/meta/src/stream/stream_graph/schedule.rs
@@ -237,7 +237,7 @@ impl Scheduler {
         let scheduled_worker_slots = scheduled
             .into_iter()
             .flat_map(|(worker_id, size)| {
-                (0..size).map(move |slot| WorkerSlotId(worker_id, slot as u32))
+                (0..size).map(move |slot| WorkerSlotId::new(worker_id, slot))
             })
             .collect_vec();
 
@@ -249,7 +249,7 @@ impl Scheduler {
         let single_scheduled = schedule_units_for_slots_v2(&slots, 1, streaming_job_id)?;
         let default_single_worker_id = single_scheduled.keys().exactly_one().cloned().unwrap();
 
-        let default_singleton_worker_slot = WorkerSlotId(default_single_worker_id, 0);
+        let default_singleton_worker_slot = WorkerSlotId::new(default_single_worker_id, 0);
 
         Ok(Self {
             default_hash_mapping,
@@ -357,7 +357,7 @@ impl Locations {
     pub fn worker_actors(&self) -> HashMap<WorkerId, Vec<ActorId>> {
         self.actor_locations
             .iter()
-            .map(|(actor_id, WorkerSlotId(worker_id, _))| (*worker_id, *actor_id))
+            .map(|(actor_id, worker_slot_id)| (worker_slot_id.worker_id(), *actor_id))
             .into_group_map()
     }
 
@@ -365,9 +365,11 @@ impl Locations {
     pub fn actor_infos(&self) -> impl Iterator<Item = ActorInfo> + '_ {
         self.actor_locations
             .iter()
-            .map(|(actor_id, WorkerSlotId(worker_id, _))| ActorInfo {
+            .map(|(actor_id, worker_slot_id)| ActorInfo {
                 actor_id: *actor_id,
-                host: self.worker_locations[worker_id].host.clone(),
+                host: self.worker_locations[&worker_slot_id.worker_id()]
+                    .host
+                    .clone(),
             })
     }
 }