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https://issues.apache.org/jira/browse/SOLR-15425?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Eric Pugh resolved SOLR-15425.
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Resolution: Not A Problem
If this is still valid, please reopen this ticket!
> Upgrade to Metrics 4.2.0
> ------------------------
>
> Key: SOLR-15425
> URL: https://issues.apache.org/jira/browse/SOLR-15425
> Project: Solr
> Issue Type: Improvement
> Components: metrics
> Reporter: Andrzej Bialecki
> Assignee: Andrzej Bialecki
> Priority: Major
>
> In addition to many fixes and compatibility with new Java versions this
> release adds a {{LockFreeExponentiallyDecayingReservoir}} which substantially
> reduces the cost of collecting histograms, especially for multi-threaded
> updates. It provides also a no-op implementation of MetricRegistry, which
> would further reduce the already small overheads when metrics collection is
> turned off.
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