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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 Tue, 08 Mar 2011 18:43:59 GMT

    [ https://issues.apache.org/jira/browse/COUCHDB-1084?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13004131#comment-13004131
] 

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

Relaximation r/w test, on My MacBook & SSD, test and DBs on the same machine:

http://graphs.mikeal.couchone.com/#/graph/698bf36b6c64dbd19aa2bef63400268f

About 10-20% more req/s and significant lower latency.

> 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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