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https://issues.apache.org/jira/browse/COUCHDB-2791?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15193124#comment-15193124
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Will Holley commented on COUCHDB-2791:
--------------------------------------
not to derail this discussion, but _bulk_get can improve replication
performance significantly - at Cloudant we've seen up to 100% improvement when
testing Cloudant Sync against it. The reason we don't see it clearly with
PouchDB is because it already uses _all_docs to achieve similar performance
gains ([as does Couchbase
Lite|https://github.com/couchbase/couchbase-lite-ios/wiki/Replication-Algorithm#performance]),
at the cost of correctness in the event of rev-1 conflicts.
In any case, I think the _bulk_get feature is orthogonal to this. Direct access
to shard _changes has use beyond CouchDB-style replication.
> Allow for direct parallel access to shards via _changes
> -------------------------------------------------------
>
> Key: COUCHDB-2791
> URL: https://issues.apache.org/jira/browse/COUCHDB-2791
> Project: CouchDB
> Issue Type: New Feature
> Components: Database Core
> Reporter: Tony Sun
> Assignee: Tony Sun
>
> For performance gains, we introduce a new _changes feed option parallel that
> returns a list of urls that the user can use to directly access individual
> shards.
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