According to my understanding, autoscaler was only dependent on Topology in order to trigger anything(startup of monitors for the already deployed application) in the restart. In that case, even though autoscaler component starts first, it has to wait until the CompleteTopologyEvent is received. At the moment autoscaler receives CompleteTopologyEvent, we can assume that the CC is ready to process.
It seems that now the flow has changed and autoscaler is no longer dependent only on the CompleteTopology to trigger the startup of monitors in the restart. Can't we make the autoscaler to only dependent on the CompleteTopology rather than directly depending on CC? Thanks, Reka On Mon, Mar 9, 2015 at 11:40 PM, Udara Liyanage <ud...@wso2.com> wrote: > Hi, > > As already mentioned OSGI dependencies will not work in a distributed > setup. Instead I prefer a event based mechanism. > > On Tue, Mar 10, 2015 at 12:06 PM, Rajkumar Rajaratnam <rajkum...@wso2.com> > wrote: > >> s/same machine/single JVM >> >> On Tue, Mar 10, 2015 at 11:51 AM, Rajkumar Rajaratnam <rajkum...@wso2.com >> > wrote: >> >>> Hi Isuru, >>> >>> Yes this happening when we are creating monitors by reading application >>> topology. And I guess enforcing OSGi dependencies among components will >>> completely break the distributed setup. Since components are not running in >>> the same machine >> AS will be waiting forever for CC service to become >>> active. >>> >>> As you said, it is better to go with event based solution. >>> >>> Thanks. >>> >>> On Tue, Mar 10, 2015 at 11:45 AM, Isuru Haththotuwa <isu...@apache.org> >>> wrote: >>> >>>> Hi Raj, >>>> >>>> On Tue, Mar 10, 2015 at 11:31 AM, Rajkumar Rajaratnam < >>>> rajkum...@wso2.com> wrote: >>>> >>>>> Hi Devs, >>>>> >>>>> I have found issues in stratos server restart. >>>>> >>>>> As you know we don't persist monitors. We read the topology and create >>>>> monitors when we restart the Stratos. While we are creating monitors, we >>>>> need to communicate with cloud controller service in-order to do things >>>>> like getting deployment policy, network partitions, validating them and so >>>>> on. In the single machine setup, AS component is starting before CC. So >>>>> when AS tries to communicate with CC, it is failing >> ultimately monitor >>>>> creation will fail. >>>>> >>>> Does this issue come in when we are creating Application Monitors? AS >>>> starts before CC -> AS tries to restore the Application Monitors from the >>>> local Applications Toplogy -> tries to communicate with CC -> leads to the >>>> issue? >>>> >>>>> >>>>> What would be solution here? Is there any way to enforce start up >>>>> orders between components? I know we can use OSGI dependencies to enforce >>>>> such order. We can make AS component to wait until CC component is >>>>> activated. But will that solve the problem in distributed setup? >>>>> >>>> AFAIK enforcing the bundle startup order will not solve this in a >>>> distributed setup. How about an event related solution? CC (or any other >>>> related component) sending an event to say that it is started? To avoid the >>>> deadlock in an event loss, maybe we can add a timeout as well. >>>> >>>>> >>>>> Please share your thoughts on this. >>>>> >>>>> Thanks. >>>>> >>>>> -- >>>>> Rajkumar Rajaratnam >>>>> Committer & PMC Member, Apache Stratos >>>>> Software Engineer, WSO2 >>>>> >>>>> Mobile : +94777568639 >>>>> Blog : rajkumarr.com >>>>> >>>>> -- >>>>> <http://rajkumarr.com> >>>>> <http://rajkumarr.com> >>>>> Thanks and Regards, >>>>> >>>>> Isuru H. >>>>> <http://rajkumarr.com> >>>>> +94 716 358 048 <http://rajkumarr.com>* <http://wso2.com/>* >>>>> >>>>> >>>>> * <http://wso2.com/>* >>>>> >>>>> >>>>> >>> >>> >>> -- >>> Rajkumar Rajaratnam >>> Committer & PMC Member, Apache Stratos >>> Software Engineer, WSO2 >>> >>> Mobile : +94777568639 >>> Blog : rajkumarr.com >>> >> >> >> >> -- >> Rajkumar Rajaratnam >> Committer & PMC Member, Apache Stratos >> Software Engineer, WSO2 >> >> Mobile : +94777568639 >> Blog : rajkumarr.com >> > > > > -- > > Udara Liyanage > Software Engineer > WSO2, Inc.: http://wso2.com > lean. enterprise. middleware > > web: http://udaraliyanage.wordpress.com > phone: +94 71 443 6897 > -- Reka Thirunavukkarasu Senior Software Engineer, WSO2, Inc.:http://wso2.com, Mobile: +94776442007
