Refactor abortion in event loop (#12312)

python/sglang/srt/managers/schedule_batch.py

@@ -505,16 +505,15 @@ class Req:
 
         # Check finish
         self.tokenizer = None
-        self.finished_reason = None
+        self.finished_reason: Optional[BaseFinishReason] = None
         # finished position (in output_ids), used when checking stop conditions with speculative decoding
         self.finished_len = None
         # Whether this request has finished output
         self.finished_output = None
-        # If we want to abort the request in the middle of the event loop, set this to true
+        # If we want to abort the request in the middle of the event loop,
+        # set to_finish instead of directly setting finished_reason.
         # Note: We should never set finished_reason in the middle, the req will get filtered and never respond
-        self.to_abort = False
-        # This carries the error message for `.to_abort` and will be attached to the finished_reason at the end of the event loop
-        self.to_abort_message: str = None
+        self.to_finish: Optional[BaseFinishReason] = None
         self.stream = stream
         self.eos_token_ids = eos_token_ids
         self.vocab_size = vocab_size
@@ -866,10 +865,9 @@ class Req:
         if self.finished():
             return
 
-        if self.to_abort:
-            self.finished_reason = FINISH_ABORT(
-                message=self.to_abort_message,
-            )
+        if self.to_finish:
+            self.finished_reason = self.to_finish
+            self.to_finish = None
             return
 
         if len(self.output_ids) >= self.sampling_params.max_new_tokens:
@@ -945,7 +943,7 @@ class Req:
         self.grammar = None
         self.origin_input_ids = [0]  # set it to one token to skip the long prefill
         self.return_logprob = False
-        self.finished_reason = FINISH_ABORT(
+        self.to_finish = FINISH_ABORT(
             error_msg, HTTPStatus.BAD_REQUEST, "BadRequestError"
         )
 
@@ -1509,7 +1507,7 @@ class ScheduleBatch(ScheduleBatchDisaggregationDecodeMixin):
         )  # avoid zero division
         new_estimate_ratio = min(1.0, new_estimate_ratio)
 
-        return retracted_reqs, new_estimate_ratio, []
+        return retracted_reqs, new_estimate_ratio
 
     def release_req(self, idx: int, remaing_req_count: int, server_args: ServerArgs):
         req = self.reqs[idx]

python/sglang/srt/managers/scheduler.py

@@ -1817,20 +1817,13 @@ class Scheduler(
             TEST_RETRACT and self.forward_ct % TEST_RETRACT_INTERVAL == 0
         ):
             old_ratio = self.new_token_ratio
-            retracted_reqs, new_token_ratio, reqs_to_abort = batch.retract_decode(
-                self.server_args
-            )
+            retracted_reqs, new_token_ratio = batch.retract_decode(self.server_args)
             self.num_retracted_reqs = len(retracted_reqs)
             self.new_token_ratio = new_token_ratio
-            for req in reqs_to_abort:
-                self.send_to_tokenizer.send_output(
-                    AbortReq(abort_reason=req.to_abort_message, rid=req.rid), req
-                )
 
             logger.info(
                 "KV cache pool is full. Retract requests. "
                 f"#retracted_reqs: {len(retracted_reqs)}, "
-                f"#aborted_retracted_reqs: {len(reqs_to_abort)}, "
                 f"#new_token_ratio: {old_ratio:.4f} -> {new_token_ratio:.4f}"
             )
 
@@ -2534,11 +2527,11 @@ class Scheduler(
             if not req.finished() and (
                 recv_req.abort_all or req.rid.startswith(recv_req.rid)
             ):
-                # Abort method 3: set `to_abort=True`
+                # Abort method 3: set `to_finish`
                 # The request will still run one decode forward pass.
                 # Then we reuse all existing code to clean up the KV cache allocation.
                 logger.debug(f"Abort running request. {req.rid=}")
-                req.to_abort = True
+                req.to_finish = FINISH_ABORT()
 
     def _pause_engine(self) -> Tuple[List[Req], int]:
         raise NotImplementedError()

python/sglang/srt/managers/scheduler_output_processor_mixin.py

@@ -789,7 +789,7 @@ class SchedulerOutputProcessorMixin:
                 continue
 
             # Multimodal partial stream chunks break the detokenizer, so drop aborted requests here.
-            if self.model_config.is_multimodal_gen and req.to_abort:
+            if self.model_config.is_multimodal_gen and req.to_finish:
                 continue
 
             if req.finished():

python/sglang/srt/managers/session_controller.py

@@ -15,11 +15,11 @@ import uuid
 from typing import Dict, Optional
 
 from sglang.srt.managers.io_struct import TokenizedGenerateReqInput
-from sglang.srt.managers.schedule_batch import Req
+from sglang.srt.managers.schedule_batch import FINISH_ABORT, Req
 
 
 class SessionReqNode:
-    def __init__(self, req, parent=None, childs=None):
+    def __init__(self, req: Req, parent=None, childs=None):
         self.req = req
         self.parent = parent
         if parent is not None:
@@ -36,12 +36,12 @@ class SessionReqNode:
             req_node.clear(req_dict)
 
         if self.req.finished_reason is None:
-            self.req.to_abort = True
+            self.req.to_finish = FINISH_ABORT()
         del req_dict[self.req.rid]
 
     def abort(self):
         if self.req.finished_reason is None:
-            self.req.to_abort = True
+            self.req.to_finish = FINISH_ABORT()
 
     def __str__(self):
         return self._str_helper(self.req.rid)