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https://issues.apache.org/jira/browse/COUCHDB-1084?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13004331#comment-13004331
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Adam Kocoloski commented on COUCHDB-1084:
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Doesn't that graph show a 10-15% drop in mean reads per second with the patch?
No idea whether that's statistically significant.
> 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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