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Posted to issues@lucene.apache.org by "ASF subversion and git services (Jira)" <ji...@apache.org> on 2019/11/11 21:08:00 UTC
[jira] [Commented] (LUCENE-9002) query caching leads to absurdly
slow queries
[ https://issues.apache.org/jira/browse/LUCENE-9002?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16971848#comment-16971848 ]
ASF subversion and git services commented on LUCENE-9002:
---------------------------------------------------------
Commit 5c536506f997ae5fb6f3a9f2544c76e66bf45c44 in lucene-solr's branch refs/heads/master from ginger
[ https://gitbox.apache.org/repos/asf?p=lucene-solr.git;h=5c53650 ]
LUCENE-9002: Query caching leads to absurdly slow queries (#940)
Co-Authored-By: Adrien Grand <jp...@gmail.com>
> query caching leads to absurdly slow queries
> --------------------------------------------
>
> Key: LUCENE-9002
> URL: https://issues.apache.org/jira/browse/LUCENE-9002
> Project: Lucene - Core
> Issue Type: Improvement
> Components: core/search
> Affects Versions: 7.7.2, 8.2
> Reporter: Guoqiang Jiang
> Priority: Major
> Labels: cache, performance
> Time Spent: 9h 20m
> Remaining Estimate: 0h
>
> *Description*
> We have dozens of ES clusters(based on Lucene) for metric scenarios. Most of the queries are like this: _host_ip:10.10.10.10 AND timestamp:[2019-10-01 00:00:00 TO 2019-10-05 23:59:59]_. And we frequently encounter some absurdly slow queries.
> *Solution*
> For a long time range query(e.g. 5 days), each range query will consume tens of megabytes of memory and spend hundreds of milliseconds to cache, but the benefits are not obvious. And those large cache entries will cause frequent cache eviction. So it's better to skip the caching action directly when large range query appears with a selective lead iterator.
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