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https://issues.apache.org/jira/browse/SOLR-16489?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17640221#comment-17640221
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Kevin Risden commented on SOLR-16489:
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Based on the PR - I opened SOLR-16562 to upgrade Caffeine which will detect
infinite loops (not fix the issue).
> CaffeineCache puts thread into infinite loop
> --------------------------------------------
>
> Key: SOLR-16489
> URL: https://issues.apache.org/jira/browse/SOLR-16489
> Project: Solr
> Issue Type: Bug
> Security Level: Public(Default Security Level. Issues are Public)
> Components: search
> Affects Versions: 9.0, 8.11.2
> Reporter: Torsten Bøgh Köster
> Priority: Major
> Time Spent: 9h 40m
> Remaining Estimate: 0h
>
> Under heavy machine load, accessing any Solr CaffeineCache can lead to
> threads spinning in an endless loop. In our setup we had machines spinning at
> 70% cpu load without receiving any request for hours.
> _Background_
> The problem is caused by delegating the {{SolrCache#put}} method to
> {{Cache#asMap#put}} Under heavy machine load with concurrent read and write
> access to the same key, the {{ConcurrentHashMap#put}} method does not
> terminate an endless loop.
> _Implementation_
> This problem can be easy be solved by delegating the {{CaffeineCache#put}}
> method to {{Cache#asMap#compute}} which uses a producer pattern. After
> introducing the fix to our environment we were not able to reproduce this
> error pattern.
> Github Pull Request: https://github.com/apache/solr/pull/1118
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