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Date: Thu, 2 Feb 2012 23:08:53 +0000 (UTC)
From: "Benoit Chesneau (Updated) (JIRA)" <jira@apache.org>
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Subject: [jira] [Updated] (COUCHDB-1398) improve view filtering in changes
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     [ https://issues.apache.org/jira/browse/COUCHDB-1398?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Benoit Chesneau updated COUCHDB-1398:
-------------------------------------

    Attachment: 0007-useless-info.patch
                0006-immprove-view-filter.patch
                0005-add-view_updated-event.patch
                0004-This-wrapper-is-useless-somehow-split-the-code-in-a-.patch
                0003-fix-indent.patch
                0002-initial-step-move-the-code-from-couch_httpd_db-to-co.patch
                0001-white-spaces.patch

First set of patches
                
> improve view filtering in changes
> ---------------------------------
>
>                 Key: COUCHDB-1398
>                 URL: https://issues.apache.org/jira/browse/COUCHDB-1398
>             Project: CouchDB
>          Issue Type: Improvement
>          Components: View Server Support
>    Affects Versions: 2.0, 1.3
>            Reporter: Benoit Chesneau
>              Labels: changes, view
>         Attachments: 0001-white-spaces.patch, 0002-initial-step-move-the-code-from-couch_httpd_db-to-co.patch, 0003-fix-indent.patch, 0004-This-wrapper-is-useless-somehow-split-the-code-in-a-.patch, 0005-add-view_updated-event.patch, 0006-immprove-view-filter.patch, 0007-useless-info.patch
>
>
> Improve the native view filter `_view` support by really using view index. This patches add following features
> - small refactoring: create the couch_httpd_changes modules, to put all the changes http support in its own module instead having it in couch_httpd_db. 
> - add the `view_updated` event when a view index is updated : {view_updated, {DbName, IndexName}}
> - start the feed using results in the view index instead of all the db index
> - only react on view index changes.
> For now next changes are still get using the couch_db:changes_since function and passing the map function to the results. It could be improved if we had a by_seq btree in the view index too. Other way may be to skip a number of the documents already processed. Not sure it would be faster. Thoughts ?
> The branch couch_view_changes  in my repo contains preliminary support:
> https://github.com/benoitc/couchdb/tree/couch_view_changes
> Diff:
> https://github.com/benoitc/couchdb/compare/master...couch_view_changes
> To use it, use the native filter named _view which take the parameter view=DesignName/Viewname
> eg:
>   http://server/db/_changes?feed=continuous&heartbeat=true&filter=_view&view=DesignName/SomeView
> It has also an interresting side effect: on each db updates the view index refresh is triggered so view updates are triggered. Maybe we could introduce an optionnal parameter to not trigger them though?

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