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https://issues.apache.org/jira/browse/SOLR-16707?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17702769#comment-17702769
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Michael Gibney commented on SOLR-16707:
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The only possible benefit of {{async=false}} that I see documented there is
{quote}
Disabling the async option may use slightly less memory per cache entry at the
expense of increased CPU
{quote}
When this says "slightly", it _really_ means slightly. Specifically, 24 bytes
-- the cost of one {{CompletableFuture}} -- per entry, according to the
implementation of {{Accountable.ramBytesUsed()}}; IMO the documented
distinction is not enough to warrant retaining this as a configuration option.
Unless maybe there's another, implicit/undocumented reason?
> TestFiltering.testRandomFiltering Caffeine cache async=false
> IllegalStateException: Recursive update
> ----------------------------------------------------------------------------------------------------
>
> Key: SOLR-16707
> URL: https://issues.apache.org/jira/browse/SOLR-16707
> Project: Solr
> Issue Type: Test
> Security Level: Public(Default Security Level. Issues are Public)
> Reporter: Mikhail Khludnev
> Priority: Minor
>
> see the linked mail thread.
> There are systematic test failures with async=false.
> Why can't we just turn `async=true` for this test and others?
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