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https://issues.apache.org/jira/browse/LUCENE-9002?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16949103#comment-16949103
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Guoqiang Jiang edited comment on LUCENE-9002 at 10/11/19 3:34 AM:
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Hi, [~jpountz], I provide a PatchÂ
[PR-940|https://github.com/apache/lucene-solr/pull/940] which refer to
[LUCENE-8027|https://issues.apache.org/jira/browse/LUCENE-8027].
I would add our considerations and test results, please help me to review.:)
was (Author: jgq2008303393):
Hi, [~jpountz], I provide a PatchÂ
[PR-940|https://github.com/apache/lucene-solr/pull/940] which refer to
[LUCENE-8027|https://issues.apache.org/jira/browse/LUCENE-8027].
I would add our considerations and test results, please help me to review.
> 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: 10m
> 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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