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From "Jan Lehnardt (JIRA)" <j...@apache.org>
Subject [jira] Commented: (COUCHDB-1084) Remove unnecessary btree lookup inside couch_db_updater
Date Wed, 09 Mar 2011 01:07:59 GMT

    [ https://issues.apache.org/jira/browse/COUCHDB-1084?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13004320#comment-13004320
] 

Jan Lehnardt commented on COUCHDB-1084:
---------------------------------------

Relaximation r/w test on a Mac Mini with a spinning disk, relaximation and CouchDB on different
machines on switched GigE ethernet.

http://graphs.mikeal.couchone.com/#/graph/698bf36b6c64dbd19aa2bef63400478c

A little less improvement, but definitely not worse. Damien says with database files larger
than available ram, the impact should be bigger. If anyone can set up a test run like that,
that'd be cool :)

> Remove unnecessary btree lookup inside couch_db_updater
> -------------------------------------------------------
>
>                 Key: COUCHDB-1084
>                 URL: https://issues.apache.org/jira/browse/COUCHDB-1084
>             Project: CouchDB
>          Issue Type: Improvement
>          Components: Database Core
>    Affects Versions: 1.2
>            Reporter: Damien Katz
>            Assignee: Damien Katz
>         Attachments: remove_btree_lookup.patch
>
>
> The CouchDB update process has an unnecessary btree lookup, where it reads the values
in bulks, checks for conflicts, writes the docs to disk, updates the values appropriately
and writes them to the btree out in a second step. It's possible to avoid this second step,
and instead do all the checking, doc writing and value transformation in a single btree lookup,
thereby reducing the number of btree traversals and disk IO.

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