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https://issues.apache.org/jira/browse/SOLR-17597?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Michael Gibney resolved SOLR-17597.
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Fix Version/s: 9.9
Resolution: Fixed
> CaffeineCache ramBytes incorrect accounting on `put()`
> ------------------------------------------------------
>
> Key: SOLR-17597
> URL: https://issues.apache.org/jira/browse/SOLR-17597
> Project: Solr
> Issue Type: Bug
> Affects Versions: main (10.0), 9.7
> Reporter: Michael Gibney
> Assignee: Michael Gibney
> Priority: Minor
> Labels: pull-request-available
> Fix For: 9.9
>
> Time Spent: 40m
> Remaining Estimate: 0h
>
> In most cases, usage of {{CaffeineCache.put()}} results in incorrect ramBytes
> accounting. Replaced values (and keys) decrement {{ramBytes}} via
> {{onRemoval()}}, so replaced values currently end up double-decrementing for
> the replaced value in
> [recordRamBytes()|https://github.com/apache/solr/blob/a4229e76771da0125b38204db01ea0934e09c4f4/solr/core/src/java/org/apache/solr/search/CaffeineCache.java#L297-L301].
> After a sufficient number of replacements via {{put()}}, {{ramBytes}} becomes
> permanently negative, and is thus useless.
> The problem was masked in existing tests due to the behavior of the Caffeine
> library in the case of reference equality between the old (replaced) value
> and the new (replacement) value for the same ({{.equals()}}) key -- [the case
> exercised in existing
> tests|https://github.com/apache/solr/blob/a4229e76771da0125b38204db01ea0934e09c4f4/solr/core/src/test/org/apache/solr/search/TestCaffeineCache.java#L342-L345]
> -- in which case {{onRemoval()}} is _not_ invoked (so there is no double
> decrement).
> The problem is also masked in normal usage, since existing/default cache
> implementations and invocation all currently use {{computeIfAbsent()}}
> instead of {{put()}}.
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