Thanks for all the information. > I'm not sure how exactly you are measuring/defining "replication lag" but > if you mean "lag in how long until the newly replicated documents are > visible in searches"
That is exactly what I wanted to say. I've attached the cache statistics. If you are interested in, a few more details on our use case : Actually, we have only few hits on Solr (about 2 req/s) but we will quickly have more than 50 req/s. The requests are mainly facet requests. The index counts about 1,5M documents and we plan a size of 15M documents in one year. Best regards, Damien ---------------- CACHE ---------------- name: queryResultCache class: org.apache.solr.search.FastLRUCache version: 1.0 description: Concurrent LRU Cache(maxSize=16384, initialSize=4096, minSize=14745, acceptableSize=15564, cleanupThread=false, autowarmCount=1024, regenerator=org.apache.solr.search.SolrIndexSearcher$3@3d762027) stats: lookups : 4 hits : 4 hitratio : 1.00 inserts : 0 evictions : 0 size : 1024 warmupTime : 20 cumulative_lookups : 1003454 cumulative_hits : 894365 cumulative_hitratio : 0.89 cumulative_inserts : 120343 cumulative_evictions : 0 name: fieldCache class: org.apache.solr.search.SolrFieldCacheMBean insanity_count : 0 name: documentCache class: org.apache.solr.search.FastLRUCache version: 1.0 description: Concurrent LRU Cache(maxSize=16384, initialSize=4096, minSize=14745, acceptableSize=15564, cleanupThread=false, autowarmCount=1024, regenerator=null) stats: lookups : 80 hits : 60 hitratio : 0.75 inserts : 20 evictions : 0 size : 20 warmupTime : 0 cumulative_lookups : 10844723 cumulative_hits : 8318341 cumulative_hitratio : 0.76 cumulative_inserts : 2526382 cumulative_evictions : 0 name: fieldValueCache class: org.apache.solr.search.FastLRUCache version: 1.0 description: Concurrent LRU Cache(maxSize=16384, initialSize=16384, minSize=14745, acceptableSize=15564, cleanupThread=false, autowarmCount=1024, regenerator=org.apache.solr.search.SolrIndexSearcher$1@38bdc9b3) stats: lookups : 2 hits : 2 hitratio : 1.00 inserts : 0 evictions : 0 size : 1 warmupTime : 1369 cumulative_lookups : 485281 cumulative_hits : 485276 cumulative_hitratio : 0.99 cumulative_inserts : 2 cumulative_evictions : 0 item_tags : {field=tags,memSize=5804302,tindexSize=36148,time=1369,phase1=1357,nTerms=118241,bigTerms=0,termInstances=448772,uses=2} name: filterCache class: org.apache.solr.search.FastLRUCache version: 1.0 description: Concurrent LRU Cache(maxSize=16384, initialSize=4096, minSize=14745, acceptableSize=15564, cleanupThread=false, autowarmCount=1024, regenerator=org.apache.solr.search.SolrIndexSearcher$2@340523df) stats: lookups : 21 hits : 21 hitratio : 1.00 inserts : 0 evictions : 0 size : 1024 warmupTime : 1305 cumulative_lookups : 5956615 cumulative_hits : 5868136 cumulative_hitratio : 0.98 cumulative_inserts : 88479 cumulative_evictions : 0