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Posted to dev@lucene.apache.org by "Joel Bernstein (JIRA)" <ji...@apache.org> on 2015/06/17 15:50:01 UTC
[jira] [Issue Comment Deleted] (SOLR-7689) ReRankQuery rewrite
method can change the QueryResultKey causing cache misses.
[ https://issues.apache.org/jira/browse/SOLR-7689?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Joel Bernstein updated SOLR-7689:
---------------------------------
Comment: was deleted
(was: New patch should resolve the cache miss issue and preserve the ReRankQuery's Explain.)
> ReRankQuery rewrite method can change the QueryResultKey causing cache misses.
> ------------------------------------------------------------------------------
>
> Key: SOLR-7689
> URL: https://issues.apache.org/jira/browse/SOLR-7689
> Project: Solr
> Issue Type: Bug
> Components: search, SearchComponents - other
> Reporter: Emad Nashed
> Assignee: Joel Bernstein
> Attachments: SOLR-7689.patch, SOLR-7689.patch, SOLR-7689.patch, SOLR-7689.patch
>
>
> In SolrIndexSearcher class, the key used to lookup results in queryResultCache uses the original query.
> However later in createNormalizedWeight the query gets re-written, and then saved in the queryResultCache after it's re-written.
> This causes cache misses for the same query, and un-necessary inserts in the queryResultCache.
> I can reproduce this using a re-ranking query that is using a main query as a dismax query, the dismax Query could be re-written into a TermQuery, which makes sense, but will cause cache misses.
> I tested a quick solution by just using q.clone() when it comes to build QueryResultKey, and it works fine, but not sure if that is the best way of doing it.
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