[SOLR-15364] Race condition when maintaining multiple CloudSolrClients for a mix of HTTP/HTTPS clusters

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 8.8
• Fix Version/s: 9.0, 8.11.2
• Component/s: SolrJ
• Assignee: Timothy Potter
• Reporter: Danny Carr
• Created: 21/Apr/21 18:14
• Updated: 12/May/22 00:26
• Resolved: 11/Mar/22 14:59

Description

After upgrading to SolrJ 8.8.0 in a request gateway server responsible for maintaining CloudSolrClient connections to multiple SolrCloud clusters, we began encountering intermittent "java.net.ssl.SSLException: Unrecognized SSL message, plaintext connection?" errors.

Some of our Solr clusters have HTTPS enabled and some do not - as far as I can tell, these issues were caused by the introduction of the global UrlScheme singleton, which would seem to make it impossible to maintain this sort of heterogenous mix of CloudSolrClients within the same JVM.

Issue Links

• is caused by: SOLR-12182 Can not switch urlScheme in 7x if there are any cores in the cluster
• is fixed by: SOLR-15587 Replicas end up with base_url as http on client side even if cluster state says https when using the HttpClusterStateProvider