Hi, we are usually using Solr Clouds with 5 nodes and up to 2000 collections and a replication factor of 2. So we have close to 1000 cores per node. That is on Solr 7.6 but I believe 7.3 worked as well. We tuned a few caches down to a minimum as otherwise the memory usage goes up a lot. The Solr UI is having some problems with a high number of collections, like lots of timeouts when loading the status.
Older Solr versions had problem with the overseer queue in ZooKeeper. If you restarted too many nodes at once then the queue got too long and Solr died and required some help and cleanup to start at all again. regards, Hendrik On 29.08.19 05:27, Hongxu Ma wrote:
Hi I have a solr-cloud cluster, but it's unstable when collection number is big: 1000 replica/core per solr node. To solve this issue, I have read the performance guide: https://cwiki.apache.org/confluence/display/SOLR/SolrPerformanceProblems I noted there is a sentence on solr-cloud section: "Recent Solr versions perform well with thousands of replicas." I want to know does it mean a single solr node can handle thousands of replicas? or a solr cluster can (if so, what's the size of the cluster?) My solr version is 7.3.1 and 6.6.2 (looks they are the same in performance) Thanks for you help.
