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Date: Thu, 16 Oct 2014 18:55:35 +0000 (UTC)
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Subject: [jira] [Commented] (GORA-377) Implement gora-metamodel module
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    [ https://issues.apache.org/jira/browse/GORA-377?page=3Dcom.atlassian.j=
ira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=3D141740=
89#comment-14174089 ]=20

Kasper S=C3=B8rensen commented on GORA-377:
--------------------------------------

Hi Lewis,

 * I'd be happy to help if I can with docs. Right now there are no gora.pro=
perties or gora mappings available in the module. Actually this points to o=
ne of my questions - how is this supposed to work... I imagine that the map=
ping would be 99% inferred since MetaModel already does a lot of detection =
of metadata. But of course I guess there will be mapping from metamodel tab=
les towards the domain objects in Gora.
 * Regarding Map-Reduce ... Yes, currently MetaModel does not have any MR f=
unctionality. It does have a way of splitting queries (QuerySplitter class)=
 so that they could transform into partitioned queries ... It does so by re=
writing the queries and introduce WHERE clauses and so on... I am not 100% =
sure that will work (well) in all cases though, since those WHERE clauses m=
ight not be optimal at all. In DataCleaner (an application that uses MetaMo=
del quite heavily) this behaviour is sometimes applied, but only for partic=
ular cases where we know it works well.

> Implement gora-metamodel module
> -------------------------------
>
>                 Key: GORA-377
>                 URL: https://issues.apache.org/jira/browse/GORA-377
>             Project: Apache Gora
>          Issue Type: New Feature
>          Components: gora-metamodel
>            Reporter: Lewis John McGibbney
>             Fix For: 0.6
>
>         Attachments: GORA-377_patch1.diff
>
>
> There have been recent discussions [0] around implementing MetaModel [1] =
in a drive to improving the Gora Query model and functionality.
> This issue is merely a placeholder for implementing exctly that.
> [0] http://www.mail-archive.com/dev%40gora.apache.org/msg05149.html
> [1] http://metamodel.incubator.apache.org/


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