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From "Paul Joseph Davis (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (COUCHDB-1270) Rewrite the view engine
Date Wed, 07 Sep 2011 21:37:09 GMT

    [ https://issues.apache.org/jira/browse/COUCHDB-1270?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13099574#comment-13099574
] 

Paul Joseph Davis commented on COUCHDB-1270:
--------------------------------------------

I would like to mention that couch_index_api.erl current does nothing at all. It was just
my scratch pad for what the indexer API would look like along with the possibility that it
eventually gets turned into a behavior. As Adam points out I think this is best left until
our source tree and installed structure are better aligned with Erlang expectations before
we force this issue.

Will fix send_after.

> Rewrite the view engine
> -----------------------
>
>                 Key: COUCHDB-1270
>                 URL: https://issues.apache.org/jira/browse/COUCHDB-1270
>             Project: CouchDB
>          Issue Type: Improvement
>          Components: JavaScript View Server
>            Reporter: Paul Joseph Davis
>         Attachments: 0001-Minor-changes-for-new-indexing-engine.patch, 0002-Create-the-couch_index-application.patch,
0003-Create-the-couch_mrview-application.patch, 0004-Remove-the-old-view-engine.patch
>
>
> The view engine has been creaky and cluttered. As shown by GeoCouch, adding new indexers
basically involves copying the entire view engine and hacking the parts that are different.
In short, the opposite of good engineering.
> Over the last couple weeks I've refactored the view engine and reimplemented the map/reduce
view engine. These changes are 100% internal and no external behavior has changed. Performance
is just a tiny bit better than trunk. I did do some playing trying to improve view update
times and there are some dances we could do, but for the time being I wanted to keep the same
general architecture for updates so that the changes are minimal.

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