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From Apache Wiki <wikidi...@apache.org>
Subject [Solr Wiki] Update of "SolrCaching" by HossMan
Date Fri, 28 May 2010 04:20:44 GMT
Dear Wiki user,

You have subscribed to a wiki page or wiki category on "Solr Wiki" for change notification.

The "SolrCaching" page has been changed by HossMan.
The comment on this change is: http://mail-archives.apache.org/mod_mbox/lucene-dev/201005.mbox/%3Calpine.DEB.1.10.1005251052040.24672@radix.cryptio.net%3E.
http://wiki.apache.org/solr/SolrCaching?action=diff&rev1=18&rev2=19

--------------------------------------------------

  
  When a new searcher is opened, its caches may be prepopulated or "autowarmed" with cached
object from caches in the old searcher. autowarmCount is the number of cached items that will
be regenerated in the new searcher. You will proably want to base the autowarmCount setting
on how long it takes to autowarm. You must consider the trade-off — time-to-autowarm versus
how warm (i.e., autowarmCount) you want the cache to be. The autowarm parameter is set for
the caches in solrconfig.xml.
  
- <!> [[Solr1.5]] autowarmCount can now be specified as a percentage (ie: "90%") which
will be evaluated relative the number of items in the existing cache.  This can be an advantageous
setting in an instance of Solr where you don't expect any search traffic (ie a master), but
you want some caches so that if it does take on traffic it won't be too overloaded.  Once
the traffic dies down, subsequent commits will gradually decrease the number of items being
warmed. 
+ <!> [[Solr4.0]] autowarmCount can now be specified as a percentage (ie: "90%") which
will be evaluated relative the number of items in the existing cache.  This can be an advantageous
setting in an instance of Solr where you don't expect any search traffic (ie a master), but
you want some caches so that if it does take on traffic it won't be too overloaded.  Once
the traffic dies down, subsequent commits will gradually decrease the number of items being
warmed. 
  
  == minSize (optional) ==
  Only applicable for `FastLRUCache` . After the cache reaches its size, the cache tries to
bring it down to the `minSize`. The default value is `0.9 * size` . 

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