Hi Gaël, Does all three servers have same specifications? On the other hand, is your load balancing configuration for Varnish is round-robin?
Kind Regards, Furkan KAMACI On Mon, Mar 4, 2019 at 3:18 PM Gael Jourdan-Weil < gael.jourdan-w...@kelkoogroup.com> wrote: > Hello, > > I come again to the community for some ideas regarding a performance issue > we are having. > > We have a SolrCloud cluster of 3 servers. > Each server hosts 1 replica of 2 collections. > There is no sharding, every server hosts the whole collection. > > Requests are evenly distributed by a Varnish system. > > During some peaks of requests, we see one server of the cluster having > very high load while the two others are totally fine. > The server experiencing this high load is always the same until we reboot > it and the behavior moves to another server. > The server experiencing the issue is not necessarily the leader. > All servers receive the same number of requests per seconds. > > Load data: > - Server1: 5% CPU when low QPS, 90% CPU when high QPS (this one having > issues) > - Server2: 5% CPU when low QPS, 25% CPU when high QPS > - Server3: 5% CPU when low QPS, 20% CPU when high QPS > > What could explain this behavior in SolrCloud mechanisms? > > Thank you for reading, > > Gaël Jourdan-Weil >
