Hi, Let's say I have my cluster topology like:
whirr.instance-templates=1 service-A+service-B, 1 service-A+service-B In my scenario, service-B should first wait for all service-A instances to come up, so that I can create some tables and populate data on only one instance of service-B. For this purpose, I first need a callback after service-A has been installed on all cluster instances, so that I can perform certain one-time activities at that point. Do we already have such a callback in whirr interfaces? I checked out ClusterActionHandler interface, but my understanding is that it applies at role level on each instance. So bootstrap/configure/start/stop get called for each instance of service-A. I couldn't find a callback when all service-A instances are installed. Additionally, is it possible to synchronize installation/starting of service-B only after all instances of service-A are installed/started? Basically, I am looking for a DAG kind of dependency mechanism to be configured across services. Thanks, Satish -- "The happiest of people don´t necessarily have the best of everything, they just make the most of everything that comes along their way."
