SolrCache implementations LRUCache, FastLRUCache and LFUCache have a parameter initialSize, that is passed directly to HashMap initialCapacity constructor argument.
For LFUCache this is the code line: map = new LinkedHashMap<K,V>(initialSize, 0.75f, true) . In solrconfig.xml I tried to set initialSize to be size/0.75 + some_more, but it's impossible to set value greather than size because of this line: final int initialSize = Math.min(str==null ? 1024 : Integer.parseInt(str), limit); For FastLRUCache there is no such limitation, but still I think documentation and default values in solrconfig.xml should not use equal values for initialSize and size.
