I do not think we need to specifically handle this, manual scaling also need to take the same path as the standard scaling decision.
On Wed, Oct 15, 2014 at 10:03 AM, Rajkumar Rajaratnam <rajkum...@wso2.com> wrote: > Or else, we can have an API at CC side to update clusters and let CC to > publish ClusterUpdated event to topology topic. AS can simply listen to > this event and update the cluster context accordingly. Then we don't need > to introduce a new topic for AS to publish events and AS is already > listening to topology topic. IMO, this is a good approach. > > Wdyt? > > > On Wednesday, October 15, 2014, Rajkumar Rajaratnam <rajkum...@wso2.com> > wrote: > >> Hi, >> >> As you know, we are now supporting manual scaling for docker containers. >> Autoscaler has an API to update cluster properties like min replicas of a >> particular cluster. >> >> void updateClusterMonitor(String clusterId, Properties properties) throws >> InvalidArgumentException; >> >> We are not persisting anything about clusters at AS side, when we >> shutdown stratos. When we are restarting, we are reading topology and >> create/populate/update cluster monitors. >> >> Hence this new value for min replicas is not persisted when we shutdown >> the stratos. During manual scaling the min replicas is updated only in AS >> side, hence if we restart the stratos, this effect will be lost. >> >> So manual scaling should impact the topology. Here is a proposed solution. >> >> AS will provide an API to update cluster monitors, that is you can update >> properties of a cluster like min replicas. Once this API is called AS will >> send a *ClusterAltered* event to CC. Once CC gets this event, it will >> validate the properties, update the topology and send a *ClusterUpdated* >> event. Once AS gets this event, AS will update the cluster context with new >> values for properties like min replicas. Until we get cluster updated >> event, AS will not alter any properties. >> Then everything is consistent and manual scaling effects will be >> persisted. >> >> wdyt? >> >> Thanks. >> >> -- >> Rajkumar Rajaratnam >> Software Engineer | WSO2, Inc. >> Mobile +94777568639 | +94783498120 >> > > > -- > Rajkumar Rajaratnam > Software Engineer | WSO2, Inc. > Mobile +94777568639 | +94783498120 > > -- Imesh Gunaratne Technical Lead, WSO2 Committer & PMC Member, Apache Stratos
