Contention issue on initial startup with multiple subscribers

[grumpydev]

I have multiple workers that subscribe with the following code:

 this._bus.SubscribeAsync<Message>(this.OnMessageReceived,
 config =>
 {
 config.WithSubscription(this._configuration["SubscriptionId"]);
 config.WithTopic(this._configuration["Topic"]);
 });

When I fire the workers up for the first time they all hit "TopicDeclare" and try and create the topic, which makes two of them crash with Conflict errors:

They start up again fine, as the next time they run they can see the topic already there so don't try and create it.

I guess the topic creation needs some code to handle conflicts and back off for a period then re-check if the topic exists?