Reinstall it. If the hardware is the same. On Mon, 4 Mar 2019, 20:45 Gael Jourdan-Weil, < gael.jourdan-w...@kelkoogroup.com> wrote:
> Hi Erick, > > We are running Solr 7.6.0. > We recently upgraded from 7.2.1 but we already had theses issues with Solr > 7.2.1. > > Is the overseer different from the leader? > In the Solr Admin UI > SolrCloud > Tree > overseer > leader file I can see > the machine being the leader is not the one having issues right now. > > Kind Regards, > Gaël > > ________________________________ > De : Erick Erickson <erickerick...@gmail.com> > Envoyé : lundi 4 mars 2019 17:57 > À : solr-user@lucene.apache.org > Objet : Re: SolrCloud one server with high load > > What version of Solr? There are some anecdotal reports of abnormal CPU > loads on very recent Solr’s. > > Is the server with the high load the “Overseer”? In the admin > UI>>SolrCloud>>tree you can see which node is the Overseer. This is really > a shot in the dark, as unless you are doing a lot of collection maintenance > operations, the Overseer shouldn’t be doing much really. > > There is _one_ Overseer per cluster and it’s in charge of coordinating > changes to ZooKeeper. > > If there’s a correlation there, it’d be great to know. It’s possible to > move the Overseer to a different node, one that’s running Solr but not > necessarily hosting any replicas. This isn’t a permanent solution, but > would help isolate the issue. > > First, let’s see if the not node is always the Overseer... > > Best, > Erick > > > On Mar 4, 2019, at 6:51 AM, Gael Jourdan-Weil < > gael.jourdan-w...@kelkoogroup.com> wrote: > > > > Hello Furkan, > > > > Yes the 3 servers have exact same configuration. > > > > Varnish load balancing is effectively round robin. > > We monitor the number of requests per second, and we effectively see the > 3 servers are receiving same amount of requests. > > > > Kind Regards, > > Gaël > > > > ________________________________ > > De : Furkan KAMACI <furkankam...@gmail.com> > > Envoyé : lundi 4 mars 2019 15:00 > > À : solr-user@lucene.apache.org > > Objet : Re: SolrCloud one server with high load > > > > 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 > >> > >
