[SOLR-6521] CloudSolrClient should synchronize cache cluster state loading

• Type: Improvement
• Status: Closed
• Priority: Critical
• Resolution: Fixed
• Fix Version/s: 5.0, 6.0
• Component/s: SolrCloud
• Labels: SolrCloud
• Assignee: Noble Paul
• Reporter: Jessica Cheng Mallet
• Created: 15/Sep/14 20:40
• Updated: 09/May/16 18:54
• Resolved: 22/Jan/15 14:47

Description

Under heavy load-testing with the new solrj client that caches the cluster state instead of setting a watcher, I started seeing lots of zk connection loss on the client-side when refreshing the CloudSolrServer collectionStateCache, and this was causing crazy client-side 99.9% latency (~15 sec). I swapped the cache out with guava's LoadingCache (which does locking to ensure only one thread loads the content under one key while the other threads that want the same key wait) and the connection loss went away and the 99.9% latency also went down to just about 1 sec.

Issue Links

• is depended upon by: SOLR-6988 Make stateformat=2 as default for Solr 5.0