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https://issues.apache.org/jira/browse/SOLR-15301?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17423896#comment-17423896
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Andrzej Bialecki commented on SOLR-15301:
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I agree, using {{CachedGauge}} is the optimal solution here. This Jira issue
can address just the index size metric, but we should audit other metrics and
wrap them in a CachedGauge-s too, anywhere where the computation is anything
other than trivial.
> 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: 40m
> 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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