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From Kasper Sørensen <i.am.kasper.soren...@gmail.com>
Subject Re: Possible collaboration between Gora and MetaModel to deliver datastore concept?
Date Sat, 13 Sep 2014 07:49:27 GMT
Hi Lewis and Henry,

Glad to see that this interests you. I did look quickly into the Gora Query
API (just the javadocs for now) and got the impression that your query
model is mostly focused around a few specific types of queries; such as
"get a record by it's key", "get a range of records by a key-range", "get
records by it's timestamp". I am still no expert, so excuse me if I make
the wrong conclusions here ... :-)

I can imagine that probably this means that your execution is quite
optimized for these few scenarios. If we initially compare then performance
of MM and Gora's queries, it might be that Gora's queries run faster for
these specific scenarios. In MetaModel the approach to developing
datastores and query model was kinda the other way around: A very wide
range of query patterns is supported (the majority of SQL, for any
datastore), but it sometimes comes at a cost of performance, since
optimizing for certain scenarios is an optional implementation detail. But
should we go in and serve Gora with a query API, I of course believe that
we should make sure that we cover your typical query scenarios with optimal
execution strategies so that this isn't a problem.

The other big thing I notice is that your Query and Result classes have
some generics involved - as far as I can gather this is to serve domain
objects back into the result. So that I can have something like a
Query<Customer> or whatever it is that I am querying. In MM we only care
about schemas, tables and columns with data. So all results (DataSet in MM)
contain rows of data. As such I can then see Gora acting as a mapping layer
between a MetaModel Row and a Gora Persistent object.

A final remark on the Datastore level - in MetaModel we deliver a Schema
(contains Tables (contains Columns)) for each datastore. Sometimes the
schema is provided natively by some metadata API or something like that. In
other cases it is inferred by looking at the data contained in the
datastore. I couldn't find something quite like this in Gora.

Best regards,

2014-09-13 7:57 GMT+02:00 Lewis John Mcgibbney <lewis.mcgibbney@gmail.com>:

> Hi Kasper
> On Fri, Sep 12, 2014 at 10:47 PM, <dev-digest-help@gora.apache.org> wrote:
> >
> > Curious to hear what you think!
> >
> > I personally think that this is an excellent idea.
> I am aware that Henry has been monitoring you guys for a while now and we
> were actually talking a bit about MetaMode this week infact.
> I think that we could certainly explore integration of MetaModel into Gora
> as one of the defining feature drives within the 0.6-SNAPSHOT development
> drive.
> We are VERY close to releasing Apache Gora 0.5 (1 issue to addres) then we
> can begin work on this.
> I wonder if you've looked into the Gora Query API at all? If so, if you
> could comment on what aspects you think MetaModel would address.
> Please feel free to open a JIRA ticket on or Jira and we can make this
> happen.
> Thanks Kasper.
> Lewis

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