Hi, - metadata should be independent from topology. Otherwise one has to tamper topology to introduce application specific metadata. (if we go in that path, we dont need metadata service at all i guess) - so udaras' idea might not work. - we need a rest api - > means packaging type would be a webapp. - how you store your data depends. (registry or your own thing) - webapp can listen to topology to keep track of terminated members or else some other component can (CC) can feed that info in. - i like the idea of webapp listening to topology. Then the only operations would be data push/pull with given compoiste app id.
thanks, --Pradeep On Tue, Jul 22, 2014 at 12:57 PM, Gayan Gunarathne <gay...@wso2.com> wrote: > Hi Imesh, > > Thanks for the clarification. > > With this approach how we add the Cartridge meta data to the registry/web > -app? > AFAIK the all the meta data related to the cartridges are not available in > the topology.As a example credential details of the MySQL cartridge not > available in the topology. > > +1 to have a loosely coupled meta data service.How about that following > approach? > We will provide rest API which can be packed in a standalone server or > single JVM instance which provide the REST API for meta data > add,remove,get. (So then topology don't need to contain the meta data of > the cartridges.) > > Thanks, > Gayan > > > > On Mon, Jul 21, 2014 at 11:44 PM, Imesh Gunaratne <im...@apache.org> > wrote: > >> Hi Gayan, >> >> Few weeks back I had a discussion on this with Lakmal and the idea was to >> use a metadata service web-app. Shall we discuss pros and cons on using the >> Registry vs a Web-app. >> >> Regarding Pradeep's question, IMO the metadata-service (either the >> registry/web-app) can listen to the topology and remove any entries created >> by a terminated member. Which means the metadata service could act without >> having any dependencies to other Stratos components. >> >> *How do we package this?* >> IMO we should be able to run the Metadata service separately (as a >> standalone server/cluster) and at the same time have it in the single JVM >> distribution. >> >> Thanks >> >> >> On Mon, Jul 21, 2014 at 8:33 AM, Udara Liyanage <ud...@wso2.com> wrote: >> >>> Hi, >>> >>> Could n't this be achieved by using the existing topology? Add some REST >>> APIs to SM which get necessary details from CC. Agent can get the IP by >>> calling the API. >>> However mysql credentials are not in topology. >>> >>> Touched, not typed. Erroneous words are a feature, not a typo. >>> >> >> >> >> -- >> Imesh Gunaratne >> >> Technical Lead, WSO2 >> Committer & PPMC Member, Apache Stratos >> > > > > -- > Best Regards, > > Gayan Gunarathne > Technical Lead > WSO2 Inc. (http://wso2.com) > email : gay...@wso2.com | mobile : +94 766819985 > > -- Pradeep Fernando. http://pradeepfernando.blogspot.com/
