kaxil commented on code in PR #44465:
URL: https://github.com/apache/airflow/pull/44465#discussion_r1862726361
##########
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:
We could get some free goodies by directly calling
`process.{kill,terminate}` -- some additional checks and cross-platform :
https://github.com/giampaolo/psutil/blob/master/psutil/__init__.py#L1326-L1334
```py
def kill(self):
"""Kill the current process with SIGKILL pre-emptively checking
whether PID has been reused.
"""
if POSIX:
self._send_signal(signal.SIGKILL)
else: # pragma: no cover
self._raise_if_pid_reused()
self._proc.kill()
```
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