Solr Filter Cache Size

[Benjamin Wiens]

How can we calculate how much heap memory the filter cache will consume? We
understand that in order to determine a good size we also need to evaluate
how many filterqueries would be used over a certain time period.



Here's our setting:



    <filterCache

      class="solr.FastLRUCache"

      size="300000"

      initialSize="300000"

      autowarmCount="50000"/>



According to the post below, 53 GB of RAM would be needed just by the
filter cache alone with 1.4 million Docs. Not sure if this true and how
this would work.



Reference:
http://stackoverflow.com/questions/20999904/solr-filter-cache-fastlrucache-takes-too-much-memory-and-results-in-out-of-mem



We filled the filterquery cache with Solr Meter and had a JVM Heap Size of
far less than 53 GB.



Can anyone chime in and enlighten us?



Thank you!


Ben Wiens & Benjamin Mosior