FrankYang0529 opened a new pull request, #74690:
URL: https://github.com/apache/airflow/pull/74690
### Why
- When Airflow wants a running task to stop, for example after a user marks
the task instance as failed, the supervisor sends the task's process SIGTERM.
If the process is still running after `[core] killed_task_cleanup_time`
seconds, the supervisor sends SIGKILL. The Go and TypeScript SDKs pass that
SIGTERM to the task through its context, so the task can stop work it started,
such as a job in an external system.
### How
- While a task runs, the SDK replaces the JVM's SIGINT and SIGTERM handlers
through `sun.misc.Signal`. It puts the old handlers back after the supervisor
has acknowledged the task's result.
- `Context.isCancelled()` and `Context.awaitCancellation(Duration)` tell a
task that Airflow asked it to stop. `awaitCancellation` can replace
`Thread.sleep` in a polling loop.
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closes: #72680
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