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The "SolrCaching" page has been changed by YonikSeeley.
The comment on this change is: hash doc set not relevant to 1.4.
http://wiki.apache.org/solr/SolrCaching?action=diff&rev1=17&rev2=18

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  == The hashDocSet Max Size ==
+ <!> This is not relevant to [[Solr1.4]] and later, which as a more efficient, 
general purpose small set implementation that currently has no external 
configuration.
  
  The hashDocSet is an optimization that enables an int hash representation for 
filters (docSets) when the number of items in the set is less than maxSize.  
For smaller sets, this representation is more memory efficient, more efficient 
to iterate, and faster to take intersections. 
  {{{

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