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The following page has been changed by StevenParkes: http://wiki.apache.org/solr/SolrCaching ------------------------------------------------------------------------------ = Overview = - Solr caches are associated with an Index Searcher — a particular 'view' of the index that doesn't change. So as long as that Index Searcher is being used, ant items in the cache will be valid and available for reuse. Caching in Solr is unlike ordinary caches in that Solr cached objects will not expire after a certain period of time; rather, cached objects will be valid as long as the Index Searcher is valid. + Solr caches are associated with an Index Searcher — a particular 'view' of the index that doesn't change. So as long as that Index Searcher is being used, any items in the cache will be valid and available for reuse. Caching in Solr is unlike ordinary caches in that Solr cached objects will not expire after a certain period of time; rather, cached objects will be valid as long as the Index Searcher is valid. The ''current'' Index Searcher serves requests and when a ''new'' searcher is opened, the new one is auto-warmed while the current one is still serving external requests. When the new one is ready, it will be ''registered'' as the ''current'' searcher and will handle any new search requests. The old searcher will be closed after all request it was servicing finish. The current Searcher is used as the source of auto-warming. When a new searcher is opened, its caches may be prepopulated or "autowarmed" using data from caches in the old searcher.
