Speeding Solr through Solr caching

Many times, the queries that are run on search are repetitive in nature. In such cases, the presence of a cache brings down the average response time for search results. Apache Solr provides a caching mechanism on top of the index data. This cache, unlike a normal cache, does not carry any expiry (persistent cache). It is associated with IndexWriter. The following are the three different types of cache supported by Solr:

  • LRUCache: This is Least Recently Used (based on synchronized LinkedHashMap) (default)
  • FastLRUCache: This is a newer form of cache and is expected to be faster than all the others
  • LFUCache: This is Least Frequently Used (based on ConcurrentHashMap)

The following are the common parameters for the cache ...

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