kocolosk commented on issue #1065: [Question] Periodic performance degradation URL: https://github.com/apache/couchdb/issues/1065#issuecomment-351729309 Hi @style95, CouchDB is configured to ~continuously cross-check the replicas of each database shard for consistency. The warning messages you observed are emitted when one of the replicas falls behind in its cross-checks, which can definitely be a side-effect of maxing out the incoming write load on the cluster. The cross-checks are not scheduled at any particular interval; rather, they are queued up whenever writes are committed. I'm not sure those warning messages are directly related to your observed throughput degradation though. Performance degradation that recovers on its own while the load is still applied is an interesting case. Do you have automatic compactions configured or anything like that? I think we may need a fair bit more detail to offer much constructive advice here.
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