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https://issues.apache.org/jira/browse/SOLR-17378?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17868199#comment-17868199
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David Smiley commented on SOLR-17378:
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Sounds useful!
> Add a RequestHandler metric for "number of outstanding concurrent requests"
> ---------------------------------------------------------------------------
>
> Key: SOLR-17378
> URL: https://issues.apache.org/jira/browse/SOLR-17378
> Project: Solr
> Issue Type: Improvement
> Security Level: Public(Default Security Level. Issues are Public)
> Reporter: Michael Gibney
> Priority: Minor
>
> "number of outstanding concurrent requests" is an important metric to track,
> and can have a significant impact on resource usage and throughput. Existing
> metrics provide a window into request count and request latency, but neither
> of these is sufficient to supply the desired "concurrency" metric.
> Leveraging request latency and completed request timestamp, it's possible to
> retroactively compute outstanding concurrent requests, but existing metrics
> are incapable of capturing this information directly or presenting it in an
> aggregate format.
> In addition to the implications for performance, it is important to have a
> window into request concurrency to complement the solr rate limiting feature,
> whose "slot acquisition" design really limits request concurrency, _not_ (as
> the name implies) request count/throughput.
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