[Bugfix][PD] Set conclude state before clear when failure happens (#7362)

Signed-off-by: Shangming Cai <caishangming@linux.alibaba.com>

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

@@ -742,12 +742,12 @@ class MooncakeKVSender(BaseKVSender):
             self.kv_mgr.request_status.pop(self.bootstrap_room)
 
     def failure_exception(self):
-        self.clear()
-
         # Explicitly set the status to failure since this request has failed in another rank
         if self.conclude_state is None:
             self.conclude_state = KVPoll.Failed
 
+        self.clear()
+
         with self.kv_mgr.failure_lock:
             failure_reason = self.kv_mgr.failure_records.pop(
                 self.bootstrap_room, "Failed due to an unknown reason from another rank"
@@ -1003,12 +1003,12 @@ class MooncakeKVReceiver(BaseKVReceiver):
             self.kv_mgr.request_status.pop(self.bootstrap_room)
 
     def failure_exception(self):
-        self.clear()
-
         # Explicitly set the status to failure since this request has failed in another rank
         if self.conclude_state is None:
             self.conclude_state = KVPoll.Failed
 
+        self.clear()
+
         with self.kv_mgr.failure_lock:
             failure_reason = self.kv_mgr.failure_records.pop(
                 self.bootstrap_room, "Failed due to an unknown reason from another rank"