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From "Adam Kocoloski (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (COUCHDB-1270) Rewrite the view engine
Date Wed, 07 Sep 2011 21:19:09 GMT

    [ https://issues.apache.org/jira/browse/COUCHDB-1270?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13099564#comment-13099564
] 

Adam Kocoloski commented on COUCHDB-1270:
-----------------------------------------

I agree with Benoit that defining a custom behaviour seems like the right approach instead
of couch_index_api.  I guess that'd require some mucking with the build system to ensure that
the compiler knows the behaviour spec?  It's not a blocker from my perspective, but I would
like to see it happen.

I haven't been too impressed with supervisors that dynamically add children.  I'd love it
if we didn't have to implement our own supervision trees everywhere, but I think that might
be something we tackle in a separate ticket.

> 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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