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From "Paul Joseph Davis (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (COUCHDB-1270) Rewrite the view engine
Date Thu, 08 Sep 2011 05:13:09 GMT

    [ https://issues.apache.org/jira/browse/COUCHDB-1270?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13099967#comment-13099967
] 

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

@Bob,

Totally see your point on being overly specific. That was one of my biggest worries when starting
this work. I had GeoCouch updated to work with a slightly older version of this patch (that
I'll rebase shortly) and have played with a few other types of indexers for giggles. One thing
I can say is that even when an indexer might not have a user controllable compaction, it seems
common enough that it should be exposed for when it exists.

> 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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