[jira] Updated: (SOLR-291) add "don't cache docList" option

["Koji Sekiguchi (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/SOLR-291?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Koji Sekiguchi updated SOLR-291:
--------------------------------

    Attachment: SOLR-291.patch

> add "don't cache docList" option
> --------------------------------
>
>                 Key: SOLR-291
>                 URL: https://issues.apache.org/jira/browse/SOLR-291
>             Project: Solr
>          Issue Type: Improvement
>          Components: search
>            Reporter: Koji Sekiguchi
>            Priority: Minor
>         Attachments: SOLR-291.patch
>
>
> 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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