Hi , We upgrade our production Solr to version 6.3 from Version 4.3.2 about a week ago. We had our Dev / QA / staging on the same version (6.3) before finally releasing the application leveraging Solr 6.3.
We did our functional and load testing on these boxes , however when we released it to production along with the same application (using SolrJ to query Solr) , we ran into severe CPU issues. Just to add we're on Master - Slave where master has index on NRTCachingDirectory and Slave on RAMDirectory. As soon as we placed the slaves under load balancer , under NO LOAD condition as well , the slave went from a load of 4 -> 10 -> 16 - > 100 in 12 mins. I suspected this to be caused due to replication but this is never ending , so before this crashed we de-provisioned it and brought it down. I'm not sure what could possibly cause it. I looked into the caches , where documentcache , filtercache , queryresultcaches are set to defaults 1024 and 100 documents. I tried observing the GC activity on GCViewer too , which does'nt really shows something alarming (as in what I feel) - a sampler at https://pastebin.com/cnuATYrS Can anyone possibly tell me the reasons ? Thanks a lot in advance. Atita
