[jira] [Work started] (COUCHDB-2724) Batch rows in streaming responses to improve throughput

["Adam Kocoloski (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/COUCHDB-2724?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Work on COUCHDB-2724 started by Adam Kocoloski.
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> Batch rows in streaming responses to improve throughput
> -------------------------------------------------------
>
>                 Key: COUCHDB-2724
>                 URL: https://issues.apache.org/jira/browse/COUCHDB-2724
>             Project: CouchDB
>          Issue Type: Improvement
>      Security Level: public(Regular issues) 
>          Components: Database Core, HTTP Interface
>            Reporter: Adam Kocoloski
>            Assignee: Adam Kocoloski
>
> [~tonysun83] showed me some profiling of the {{_changes}} feed which indicated that the coordinator process was spending about 1/3 of its time executing inside {{send_delayed_chunk}}. We can reduce the number of invocations of this function by buffering individual rows until we reach a (configurable) threshold for sending the data out the wire.
> We'll of course want to be careful about continuous feeds; if we're in the "slow drip" portion of the feed we'll obviously want to emit right away instead of adding latency unnecessarily.



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