mridulm commented on pull request #33869:
URL: https://github.com/apache/spark/pull/33869#issuecomment-915428381
@tgravescs Shutdown would not stop existing threads - all will continue to
run (daemon and non-daemon 'regular' threads and shutdown hooks) - and when all
shutdown hooks are complete, vm shuts down.
A simple test to validate:
```
public class Test {
public static void main(String[] args) throws Exception {
Runtime.getRuntime().addShutdownHook(new Thread(new Runnable() {
public void run() {
System.out.println("From shutdown hook");
for (int i = 0;i < 10; i ++) {
try { Thread.sleep(1000); } catch (Exception ex) {}
System.out.println("from hook ... i = " + i);
}
}
}));
Thread th = new Thread(new Runnable() {
public void run() {
System.out.println("From busy thread");
int i = 0;
while (true) {
i += 1;
try { Thread.sleep(500); } catch (Exception ex) {}
System.out.println("from busy ... i = " + i);
}
}
});
th.setDaemon(true);
th.start();
int mainCount = 0;
while(true) {
System.out.println("Main thread ... " + mainCount);
mainCount += 1;
Thread.sleep(1000);
}
}
}
```
(Ctrl + C to initiate shutdown to expose messages continuing from all three
threads until shutdown is complete).
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