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https://issues.apache.org/jira/browse/SOLR-14428?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Colvin Cowie updated SOLR-14428:
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Attachment: screenshot-2.png
> FuzzyQuery has severe memory usage in 8.5
> -----------------------------------------
>
> Key: SOLR-14428
> URL: https://issues.apache.org/jira/browse/SOLR-14428
> Project: Solr
> Issue Type: Bug
> Security Level: Public(Default Security Level. Issues are Public)
> Affects Versions: 8.5, 8.5.1
> Reporter: Colvin Cowie
> Priority: Major
> Attachments: FuzzyHammer.java, image-2020-04-23-09-18-06-070.png,
> screenshot-1.png, screenshot-2.png
>
>
> I sent this to the mailing list
> I'm moving from 8.3.1 to 8.5.1, and started getting Out Of Memory Errors
> while running our normal tests. After profiling it was clear that the
> majority of the heap was allocated through FuzzyQuery.
> LUCENE-9068 moved construction of the automata from the FuzzyTermsEnum to the
> FuzzyQuery's constructor.
> I created a little test ( [^FuzzyHammer.java] ) that fires off fuzzy queries
> from random UUID strings for 5 minutes
> {code}
> FIELD_NAME + ":" + UUID.randomUUID().toString().replace("-", "") + "~2"
> {code}
> When running against a vanilla Solr 8.31 and 8.4.1 there is no problem, while
> the memory usage has increased drastically on 8.5.0 and 8.5.1.
> Comparison of heap usage while running the attached test against Solr 8.3.1
> and 8.5.1 with a single (empty) shard and 4GB heap:
> !image-2020-04-23-09-18-06-070.png!
> And with 4 shards on 8.4.1 and 8.5.0:
> !screenshot-1.png!
> I'm guessing that the memory might be being leaked if the FuzzyQuery objects
> are referenced from the cache, while the FuzzyTermsEnum would not have been.
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