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From Lahiru Gunathilake <>
Subject Suggessions for app-catalog design
Date Fri, 25 Jul 2014 07:43:09 GMT
Hi All,

I think app-catalog design is a well-thought comprehensive design and I
would like to propose following suggestions. Please correct me if I am

I think we have to minimize the complexity in app-catalog model if some of
the components are not really necessary in 99% of our scenarios. If the
corner cases are complex we shouldn't make things complex for our most
frequent scenarios.

Example: I think we do not need a layer of module and I think its not worth
api dealing with whole module layer. We can simply achieve the module layer
information by giving some meaningful name for the application Deployment

I think we should remove all the Id based query because its very difficult
to program against Ids, IMHO exposing the Ids in the API is a bad design.
If someone try to create same named document in same level again we can
simply give an error without exposing Ids to the API. To achieve this we
should not allow users to create Application deployment documents before
they create its Application interface and parsing along the application
interface name.

And in practice allowing users to give same names is a bad design (with Id
model we allow users to give same name) because ultimately what users will
see is set of names not the Ids, so I think we have to enforce that in the
API. I think good API should always lead users to do minimum errors.

For me this is more like a tree structure and we do not have scenario of
random access. If we know all the names we should be able to get it in a
single call with all the objects in it as we do in a normal tree where data
will be stored in the leaf nodes. Currently we do lot of traversing among
different documents, these methods will be useful during scheduling but in
the case of using Experiment configuration where we specify everything
precisely we should be able to get it right away.

System Analyst Programmer
Indiana University

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