add "don't cache docList" option
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Key: SOLR-291
URL: https://issues.apache.org/jira/browse/SOLR-291
Project: Solr
Issue Type: Improvement
Components: search
Reporter: Koji Sekiguchi
Priority: Minor
WHAT:
A flag "noCacheIfLarger" is added to <queryResultWindowSize/> tag, i.e.
<queryResultWindowSize noCacheIfLarger="true">50</queryResultWindowSize>. The
flag can be omitted and the default is false.
If this flag is set to true and user requires more results (in this case,
start>=50), SolrIndexSearcher doesn't put the docList into queryResultCache.
WHY(USE CASE):
The Solr administrator can calculate *max* memory consumption for filterCache
and documentCache as follows:
filterCache: BitDocSet size * max size (cache entries)
documentCache: average document size * max size (cache entries)
however, the memory consumtion for queryResultCache is unpredictable.
With this patch, if the administrator wants to control memory consumtion more
strict, he can set queryResultWindowSize with noCacheIfLarger="true".
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