ashb commented on code in PR #44465:
URL: https://github.com/apache/airflow/pull/44465#discussion_r1862731293


##########
task_sdk/src/airflow/sdk/execution_time/supervisor.py:
##########
@@ -391,12 +391,55 @@ def _send_startup_message(self, ti: TaskInstance, path: 
str | os.PathLike[str],
         self.stdin.write(msg.model_dump_json().encode())
         self.stdin.write(b"\n")
 
-    def kill(self, signal: signal.Signals = signal.SIGINT):
+    def kill(
+        self,
+        signal_to_send: signal.Signals = signal.SIGINT,
+        escalation_delay: float = 5.0,
+        bypass_escalation: bool = False,
+    ):
+        """
+        Attempt to terminate the subprocess with a given signal.
+
+        If the process does not exit within `escalation_delay` seconds, 
escalate to SIGTERM and eventually SIGKILL if necessary.
+
+        :param signal_to_send: The signal to send initially (default is 
SIGINT).
+        :param escalation_delay: Time in seconds to wait before escalating to 
a stronger signal.
+        :param bypass_escalation: If True, send the signal directly to the 
process without escalation.
+        """
         if self._exit_code is not None:
             return
 
-        with suppress(ProcessLookupError):
-            os.kill(self.pid, signal)
+        if bypass_escalation:
+            with suppress(ProcessLookupError):
+                os.kill(self.pid, signal_to_send)
+            return
+
+        # Escalation sequence: SIGINT -> SIGTERM -> SIGKILL
+        escalation_path = [signal.SIGINT, signal.SIGTERM, signal.SIGKILL]
+        if signal_to_send in escalation_path:
+            # Start from `initial_signal`
+            escalation_path = 
escalation_path[escalation_path.index(signal_to_send) :]
+
+        for sig in escalation_path:
+            try:
+                if sig == signal.SIGKILL:
+                    self._process.kill()
+                elif sig == signal.SIGTERM:
+                    self._process.terminate()
+                else:
+                    os.kill(self.pid, sig)

Review Comment:
   In which case, use `self._process.send_singal(sig)` -- that does the same 
https://github.com/giampaolo/psutil/blob/master/psutil/__init__.py#L1278-L1291



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