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

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

Adam Kocoloski created COUCHDB-2724:
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             Summary: 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


[~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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