[GitHub] wohali commented on issue #230: seq_interval parameter for /db/_changes endpoint is not documented

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wohali commented on issue #230: seq_interval parameter for /db/_changes endpoint is not documented
URL: https://github.com/apache/couchdb-documentation/issues/230#issuecomment-373754139
 
 
   Draft text to include:
   
   > When fetching changes in a batch, setting the seq_interval parameter tells CouchDB to only calculate the seq_interval with every Nth result returned. By setting `seq_interval=<batch size>`, where `<batch size>` is the number of results requested per batch, load can be reduced on the source CouchDB database; computing the seq value across many shards (esp. in highly-sharded databases) is expensive in a heavily loaded CouchDB cluster.
   
   > Cloudant Sync and PouchDB already optimize this parameter by setting `seq_interval=<batch size>`.
     and increase throughput by reducing latency between sequential requests in bulk document transfers. This has resulted in up to a 20% replication performance improvement in the scenario previously described.
   

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