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https://issues.apache.org/jira/browse/COUCHDB-1288?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13108036#comment-13108036
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Filipe Manana commented on COUCHDB-1288:
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Thanks Bob.
If it's separate issue, unrelated to any changes from this patch, it should go
into a separate patch/ticket :)
> More efficient builtin filters _doc_ids and _design
> ---------------------------------------------------
>
> Key: COUCHDB-1288
> URL: https://issues.apache.org/jira/browse/COUCHDB-1288
> Project: CouchDB
> Issue Type: Improvement
> Reporter: Filipe Manana
> Attachments: couchdb_1288_2.patch, couchdb_1288_3.patch
>
>
> We have the _doc_ids and _design _changes filter as of CouchDB 1.1.0.
> While they meet the expectations of applications/users, they're far from
> efficient for large databases.
> Basically the implementation folds the entire seq btree and then filters
> values by the document's ID, causing too much IO and busting caches. This
> makes replication by doc IDs not so efficient as it could be.
> The proposed patch avoids this by doing direct lookups in the ID btree, for
> _doc_ids, and ranged fold for _design.
> If there are no objections, I would apply to branch 1.2.x besides
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