No it is not possible. This is because ServiceA does not know about ServiceB. What you are saying is that instanceA has a dependency on instanceB. I think that currently there are people working on this. For me, I use the Whirr Java API to individually access the methods bootstrapCluster and configureCluster and created my own dependency system.
On Mon, Aug 12, 2013 at 11:28 AM, Satish Mittal <satish.mit...@gmail.com>wrote: > Hi, > > Any thoughts/pointers? > > Thanks in advance, > Satish > > > On Thu, Aug 8, 2013 at 12:24 PM, Satish Mittal <satish.mit...@gmail.com>wrote: > >> 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." >> > > > > -- > "The happiest of people don´t necessarily have the best of everything, > they just make the most of everything that comes along their way." >
