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From "Chris Anderson (JIRA)" <j...@apache.org>
Subject [jira] Commented: (COUCHDB-631) Replication by doc Ids
Date Wed, 27 Jan 2010 16:46:34 GMT

    [ https://issues.apache.org/jira/browse/COUCHDB-631?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12805566#action_12805566
] 

Chris Anderson commented on COUCHDB-631:
----------------------------------------

There's a better approach:

Instead of following _changes at all, just replicate the list of docs directly. Since we don't
keep old revs around, this won't be any different than normal replication (for those docs).

The #1 use case for this sort of thing is when you have a short list of docs you want to replicate
from a large database. If you traverse the by_seq index you have to look at all the docids
in the database. If you lookup the handlful of docs on your list, it's much faster.

> Replication by doc Ids
> ----------------------
>
>                 Key: COUCHDB-631
>                 URL: https://issues.apache.org/jira/browse/COUCHDB-631
>             Project: CouchDB
>          Issue Type: New Feature
>          Components: Replication
>         Environment: trunk
>            Reporter: Filipe Manana
>            Assignee: Chris Anderson
>            Priority: Minor
>         Attachments: replication-by-doc-ids-alternative-impl-2_trunk.patch, replication-by-doc-ids-alternative-impl_trunk.patch,
replication-by-doc-ids_trunk.patch
>
>
> The following patch adds support for the optional "doc_ids" attribute (array of strings)
of a JSON replication object.
> The idea was suggested recently by Chris Anderson in the dev mailing list.

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