From 26d94deec4b3f9ed8b8ca08dcb937273d3914267 Mon Sep 17 00:00:00 2001
From: Zilin Zhu <zhuzilinallen@gmail.com>
Date: Thu, 11 Jun 2026 08:48:42 +0000
Subject: [PATCH] Use /v1/loads to re-abort server

---
 slime/backends/sglang_utils/server_control.py | 67 +++++++++++++++++++
 slime/rollout/sglang_rollout.py               |  8 +--
 2 files changed, 69 insertions(+), 6 deletions(-)
 create mode 100644 slime/backends/sglang_utils/server_control.py

diff --git a/slime/backends/sglang_utils/server_control.py b/slime/backends/sglang_utils/server_control.py
new file mode 100644
index 0000000000..56da8e4c16
--- /dev/null
+++ b/slime/backends/sglang_utils/server_control.py
@@ -0,0 +1,67 @@
+import asyncio
+import logging
+from typing import Any
+
+from slime.utils.http_utils import get, post
+
+logger = logging.getLogger(__name__)
+
+ABORT_RETRY_INTERVAL_SECONDS = 3
+
+
+def num_requests_from_load(load: Any) -> int:
+    if isinstance(load, list):
+        return sum(num_requests_from_load(item) for item in load)
+
+    if not isinstance(load, dict):
+        return 0
+
+    if "loads" in load:
+        return num_requests_from_load(load["loads"])
+
+    for key in ("num_reqs", "num_total_reqs", "total_reqs"):
+        value = load.get(key)
+        if isinstance(value, int):
+            return value
+
+    running = load.get("num_running_reqs", load.get("total_running_reqs"))
+    waiting = load.get("num_waiting_reqs", load.get("total_waiting_reqs"))
+    return (running if isinstance(running, int) else 0) + (waiting if isinstance(waiting, int) else 0)
+
+
+async def _abort_server_once(url: str) -> None:
+    try:
+        await post(f"{url}/abort_request", {"abort_all": True})
+    except Exception as e:
+        logger.warning(f"Failed to abort SGLang server at {url}: {e}")
+
+
+async def _get_server_num_requests(url: str) -> int:
+    return num_requests_from_load(await get(f"{url}/v1/loads?include=core"))
+
+
+async def abort_server_until_idle(url: str, retry_interval: int = ABORT_RETRY_INTERVAL_SECONDS) -> None:
+    attempt = 1
+    while True:
+        logger.info(f"Abort request for SGLang server {url}")
+        await _abort_server_once(url)
+
+        try:
+            num_requests = await _get_server_num_requests(url)
+        except Exception as e:
+            logger.warning(f"Failed to get SGLang server load from {url}: {e}")
+            return
+
+        if num_requests <= 0:
+            return
+
+        logger.info(
+            f"SGLang server {url} still has {num_requests} requests after abort attempt {attempt}; "
+            f"retrying in {retry_interval} seconds."
+        )
+        await asyncio.sleep(retry_interval)
+        attempt += 1
+
+
+async def abort_servers_until_idle(urls: list[str]) -> None:
+    await asyncio.gather(*(abort_server_until_idle(url) for url in urls))
diff --git a/slime/rollout/sglang_rollout.py b/slime/rollout/sglang_rollout.py
index eee3a13680..bb87360639 100644
--- a/slime/rollout/sglang_rollout.py
+++ b/slime/rollout/sglang_rollout.py
@@ -14,6 +14,7 @@
 from packaging.version import parse
 from tqdm import tqdm
 
+from slime.backends.sglang_utils.server_control import abort_servers_until_idle
 from slime.rollout.base_types import RolloutFnEvalOutput, RolloutFnTrainOutput
 from slime.rollout.filter_hub.base_types import MetricGatherer, call_dynamic_filter
 from slime.utils.async_utils import run
@@ -361,12 +362,7 @@ async def abort(args: Namespace, rollout_id: int) -> list[list[Sample]]:
         response = await get(f"http://{args.sglang_router_ip}:{args.sglang_router_port}/workers")
         urls = [worker["url"] for worker in response["workers"]]
 
-    logger.info(f"Abort request for {urls}")
-    abort_tasks = [post(f"{url}/abort_request", {"abort_all": True}) for url in urls]
-    abort_results = await asyncio.gather(*abort_tasks, return_exceptions=True)
-    for url, result in zip(urls, abort_results, strict=False):
-        if isinstance(result, Exception):
-            logger.warning(f"Failed to abort worker at {url}: {result}")
+    await abort_servers_until_idle(urls)
 
     # make sure all the pending tasks are finished
     count = 0