style95 opened a new issue #1065: [Question] Performance tuning recommendation URL: https://github.com/apache/couchdb/issues/1065 I am benchmarking bulk API to inserts bunch of documents against CouchDB cluster. I am batching 500 documents into one request and my setup is comprised of 3 CouchDB nodes. I am facing periodic performance degradation. I think this is because CouchDB should periodically synchronize its pending changes. I could observe many `pending_changes` logs. ``` [warning] 2017-12-13T07:22:48.173767Z [email protected] <0.294.0> -------- mem3_sync shards/a0000000-bfffffff/lambda-bmt_activations.1513147731 [email protected] {pending_changes,54247} ``` I already looked into this guide, but it did not help me http://docs.couchdb.org/en/2.1.1/maintenance/performance.html#disk-and-file-system-performance Once performance is dropped, it took about 30s ~ 60s to get back to the stable state.  Is there any way to alleviate this problem?
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