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https://issues.apache.org/jira/browse/SOLR-15301?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17423023#comment-17423023
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David Smiley commented on SOLR-15301:
-------------------------------------

The committed solution is a hack that adds complexity.  Are we sure the client 
simply can't ask for the specific metrics they want?  It's an anti-pattern to 
ask Solr for all possible metrics (only reasonable in dev / exploration).

An alternative solution that avoids a ThreadLocal is to have a timestamp with 
the value and consider the older value to be expired after maybe a second.

> Eliminate repetitive index size calculation for Solr metrics
> ------------------------------------------------------------
>
>                 Key: SOLR-15301
>                 URL: https://issues.apache.org/jira/browse/SOLR-15301
>             Project: Solr
>          Issue Type: Improvement
>          Components: metrics
>            Reporter: Andras Salamon
>            Assignee: Andras Salamon
>            Priority: Minor
>             Fix For: main (9.0)
>
>          Time Spent: 0.5h
>  Remaining Estimate: 0h
>
> During metrics calculation Solr asks for core indexSize three times. Twice in 
> SolrCore and once in ReplicationHandler. It slows down metrics calculation 
> and it is also possible that these three reported values are not exactly the 
> same if size changes during calculation.



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