Appengine standard java shutdown callback

[Linus Larsen]

I'm using pubsub with batching and I wan't to be able to drain the queue on any pontential messages before the instance shutdown.

Piece of cake I thougt, just call shutdown() in LifecycleManager.shutdown(), end of story. However I'm running my instances with

autoscaling and there seems to be no way to get a proper callback when the servlet container is shutting down.

• LifecycleManager listener only works with manual and basic instance classes // as per documentation 
• ServletContextListener.contextDestroy is never invoked by appengine // as per documentation
• "_ah/stop" is never called on auto scaled instances // as per documentation

Surely there must be a way of getting notified when an instance is about to shut down?

[Linus Larsen]

FK, I filed a feature request, https://issuetracker.google.com/issues/114794562

[Katayoon (Cloud Platform Support)]

As you pointed to this case in your feature request, shutdown hooks only work for manual scaled instances on the standard runtime. So, tracking your feature request is recommended for this case.