Re: [google-appengine] Re: is it possible listen to a pub/sub topic without a subscription?

['Olu' via Google App Engine]

If you want a feature that offers a different behavior on Cloud PubSub, I 
recommend reporting this Feature Request 

 on 
the Issue tracker . The Feature request 
would be submitted to the PubSub Engineers. However, Feature Requests are 
subject to evaluations and there are usually no ETA for the implementation. 

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Re: [google-appengine] Re: is it possible listen to a pub/sub topic without a subscription?

['Olu' via Google App Engine]

By design, for every subscription the Google Cloud PubSub delivers messages 
at least once. Hence, even if the subscriber is not present 
, the unacknowledged 
messages are stored in a persistent storage for 7 days after the messages 
are published. 

The documentation 
 
explains 
the exceptions to the "at least once delivery" approach of the Cloud PubSub 
and why a message would be deleted. Messages published before a 
subscription is created would not be retrievable. Also, a maximum retention 
of 7 days, after which the message would be deleted.

Hence, it is intended behavior that your Subscriber would still be able to 
retrieve backlogs of messages (that are under 7 days), even if it was off 
for some time.

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Re: [google-appengine] Re: is it possible listen to a pub/sub topic without a subscription?

[Nick Pomfret]

I'm not sure I understand your answer.

Maybe my question was unclear...  I am publishing messages onto  a topic.
If my app isn't running I'm happy for those messages to disappear. AND I
don't want a backlog of messages when I switch my app on.  I want topic
behaviour, not queue behaviour (which is what I'm getting when I create a
subscriber).



On Mon, 29 Oct 2018 at 18:12, 'Julie (cloud platform support)' via Google
App Engine  wrote:

> According to this Pub/Sub FAQ question
> 
> trying to publish a topic
> without subscriptions will result in the messages being dropped, however
> the publish operation should succeed which you can use to confirm that your
> application is switched on.
>
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