The values you have for the caches and the maxwarmingsearchers do not look like the default. Cache sizes are 512 for the most part and maxwarmingsearchers are 2 (if not limit them to 2)
Sudden CPU spikes probably indicate GC issues. The # of documents you have is small, are they huge documents? The # of collections is OK in general but since they are crammed in 5 Solr nodes the memory requirements might be bigger. Especially if filter and the other caches get populated with 50K entries. I'd first go through the GC activity to make sure that this is not causing the issue. The fact that you lose some Solr servers is also an indicator of large GC pauses that might create a problem when Solr communicates with Zookeeper. -- Sent from: https://lucene.472066.n3.nabble.com/Solr-User-f472068.html
