[jira] [Updated] (SOLR-17131) Optimize rows=0 queries since score/sort isn't necessary

["Kevin Risden (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/SOLR-17131?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Kevin Risden updated SOLR-17131:
--------------------------------
    Status: Patch Available  (was: Open)

> Optimize rows=0 queries since score/sort isn't necessary
> --------------------------------------------------------
>
>                 Key: SOLR-17131
>                 URL: https://issues.apache.org/jira/browse/SOLR-17131
>             Project: Solr
>          Issue Type: Improvement
>      Security Level: Public(Default Security Level. Issues are Public) 
>            Reporter: Kevin Risden
>            Assignee: Kevin Risden
>            Priority: Major
>
> If a query has rows=0 Solr does not need to sort the results or even compute the score. This means the filterCache can be more efficient to compute the result and Solr doesn't spend time on unnecessarily sorting and scoring large result sets for it to be thrown away.
> This was found while looking at https://issues.apache.org/jira/browse/SOLR-14765 and trying to reason through the case of rows=0 that are sometimes used to just determine count of matching results. This change adds the check for rows=0 before other checks to ensure that we can short circuit scoring even if there is a scoring query. We also don't add the query to the filter cache since that could result in filter cache thrashing.
> In some tests, we found that queries with rows=0 p99 improved by 50% and CPU dropped by 5%.



--
This message was sent by Atlassian Jira
(v8.20.10#820010)

---------------------------------------------------------------------
To unsubscribe, e-mail: issues-unsubscribe@solr.apache.org
For additional commands, e-mail: issues-help@solr.apache.org