I have a solr 5.4 cluster with three collections, A, B, C. Nodes either host replicas for collection A, or B and C. Collections B and C are not currently used - no inserts or queries. Collection A is getting significant query traffic, but no insert traffic, and queries are only directed to nodes hosting replicas for collection A. ZK timeout is set to 15 seconds.
I’ve noticed via tcpdump that, every 10 seconds exactly, several of the nodes (but not all) hosting collection A re-download the state.json for collections B and C. This behavior survives JVM restart. This isn’t a huge deal, the extra traffic isn’t very meaningful, but it’s odd and smells like a bug somewhere. Anyone seen something like this?
