[PD] Centralize per-room cleanup in common backend (#24601)

Signed-off-by: Shangming Cai <csmthu@gmail.com>

python/sglang/srt/disaggregation/common/conn.py

@@ -183,12 +183,6 @@ class CommonKVManager(BaseKVManager):
         return self.request_status[bootstrap_room]
 
     def update_status(self, bootstrap_room: int, status: KVPoll):
-        if (
-            status == KVPoll.Failed
-            and self.disaggregation_mode == DisaggregationMode.PREFILL
-            and hasattr(self, "req_to_decode_prefix_len")
-        ):
-            self.req_to_decode_prefix_len.pop(bootstrap_room, None)
         if bootstrap_room not in self.request_status:
             # Do not resurrect a cleared entry with Failed: once clear() has
             # popped the room from request_status, any late update_status(Failed)
@@ -545,6 +539,13 @@ class CommonKVSender(BaseKVSender):
     def failure_exception(self):
         raise Exception("Fake KVReceiver Exception")
 
+    def clear(self) -> None:
+        self.kv_mgr.request_status.pop(self.bootstrap_room, None)
+        if hasattr(self.kv_mgr, "req_to_decode_prefix_len"):
+            self.kv_mgr.req_to_decode_prefix_len.pop(self.bootstrap_room, None)
+        if hasattr(self.kv_mgr, "transfer_infos"):
+            self.kv_mgr.transfer_infos.pop(self.bootstrap_room, None)
+
     def abort(self):
         self.kv_mgr.record_failure(
             self.bootstrap_room,
@@ -740,6 +741,11 @@ class CommonKVReceiver(BaseKVReceiver):
     def failure_exception(self):
         raise Exception("Fake KVReceiver Exception")
 
+    def clear(self) -> None:
+        self.kv_mgr.request_status.pop(self.bootstrap_room, None)
+        self.kv_mgr.required_prefill_response_num_table.pop(self.bootstrap_room, None)
+        self.kv_mgr.prefill_response_tracker.pop(self.bootstrap_room, None)
+
     def abort(self):
         self.kv_mgr.record_failure(
             self.bootstrap_room,

python/sglang/srt/disaggregation/mooncake/conn.py

@@ -1736,10 +1736,6 @@ class MooncakeKVSender(CommonKVSender):
         else:
             return self.conclude_state
 
-    def clear(self) -> None:
-        if self.bootstrap_room in self.kv_mgr.request_status:
-            self.kv_mgr.request_status.pop(self.bootstrap_room)
-
     def failure_exception(self):
         # Explicitly set the status to failure since this request has failed in another rank
         if self.conclude_state is None:
@@ -1911,16 +1907,6 @@ class MooncakeKVReceiver(CommonKVReceiver):
         else:
             return self.conclude_state
 
-    def clear(self) -> None:
-        if self.bootstrap_room in self.kv_mgr.request_status:
-            self.kv_mgr.request_status.pop(self.bootstrap_room)
-
-        if self.bootstrap_room in self.kv_mgr.required_prefill_response_num_table:
-            self.kv_mgr.required_prefill_response_num_table.pop(self.bootstrap_room)
-
-        if self.bootstrap_room in self.kv_mgr.prefill_response_tracker:
-            self.kv_mgr.prefill_response_tracker.pop(self.bootstrap_room)
-
     def failure_exception(self):
         # Explicitly set the status to failure since this request has failed in another rank
         if self.conclude_state is None:

python/sglang/srt/disaggregation/mori/conn.py

@@ -959,9 +959,6 @@ class MoriKVSender(CommonKVSender):
         self._notify_decode(KVPoll.Failed, failure_reason)
         self.conclude_state = KVPoll.Failed
 
-    def clear(self) -> None:
-        self.kv_mgr.request_status.pop(self.bootstrap_room, None)
-
     def failure_exception(self):
         if self.conclude_state is None:
             self._finalize_failure()
@@ -1087,9 +1084,7 @@ class MoriKVReceiver(CommonKVReceiver):
     def clear(self) -> None:
         if self.bootstrap_room is None:
             return
-        self.kv_mgr.request_status.pop(self.bootstrap_room, None)
-        self.kv_mgr.required_prefill_response_num_table.pop(self.bootstrap_room, None)
-        self.kv_mgr.prefill_response_tracker.pop(self.bootstrap_room, None)
+        super().clear()
         self.kv_mgr._cleanup_room_tracking(self.bootstrap_room)
 
     def failure_exception(self):

python/sglang/srt/disaggregation/nixl/conn.py

@@ -1009,9 +1009,6 @@ class NixlKVManager(CommonKVManager):
                     aux_notif,
                 )
                 handles.append(aux_xfer_handle)
-        if is_last:
-            del self.transfer_infos[bootstrap_room]
-            self.req_to_decode_prefix_len.pop(bootstrap_room, None)
         return handles
 
     def update_transfer_status(self):
@@ -1185,7 +1182,6 @@ class NixlKVSender(CommonKVSender):
         self.chunk_id += 1
         if is_last:
             self.has_sent = True
-            del self.kv_mgr.request_status[self.bootstrap_room]
 
     def poll(self) -> KVPoll:
         if self._send_failed: