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From Kasper Sørensen (JIRA) <j...@apache.org>
Subject [jira] [Commented] (GORA-377) Implement gora-metamodel module
Date Thu, 16 Oct 2014 18:55:35 GMT

    [ https://issues.apache.org/jira/browse/GORA-377?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14174089#comment-14174089

Kasper Sørensen commented on GORA-377:

Hi Lewis,

 * I'd be happy to help if I can with docs. Right now there are no gora.properties or gora
mappings available in the module. Actually this points to one of my questions - how is this
supposed to work... I imagine that the mapping 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
tables towards the domain objects in Gora.
 * Regarding Map-Reduce ... Yes, currently MetaModel does not have any MR functionality. It
does have a way of splitting queries (QuerySplitter class) so that they could transform into
partitioned queries ... It does so by rewriting 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
might not be optimal at all. In DataCleaner (an application that uses MetaModel quite heavily)
this behaviour is sometimes applied, but only for particular cases where we know it works

> 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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