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https://issues.apache.org/jira/browse/SOLR-13433?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16896974#comment-16896974
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Andrzej Bialecki commented on SOLR-13433:
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With the exception of the boolean flag this functionality has been implemented
as a part of SOLR-13558.
Tracking this value at all times has negligible cost but it provides useful
information about the actual cache RAM consumption even when {{maxRamMB}} is
not in use.
> Optionally track and expose ram usage for filter and query result caches
> ------------------------------------------------------------------------
>
> Key: SOLR-13433
> URL: https://issues.apache.org/jira/browse/SOLR-13433
> Project: Solr
> Issue Type: Improvement
> Reporter: Shalin Shekhar Mangar
> Assignee: Andrzej Bialecki
> Priority: Major
> Fix For: master (9.0), 8.2
>
>
> One can enable maxRamMB on filter and query result caches and in that case
> the ram usage of the caches is maintained and exposed as well as the entries
> are evicted according to overall ram usage. However, the two features need
> not be coupled together i.e. tracking and exposing ram usage can be a
> separate feature from evicting by ram usage.
> I propose to add an optional {{showRamUsage}} to filter and query result
> caches that can be enabled to expose ram size of the cache. The default will
> be off but if {{maxRamMB}} is set then {{showRamUsage}} is automatically set
> to true.
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