[jira] [Commented] (SOLR-17378) Add a RequestHandler metric for "number of outstanding concurrent requests"

["David Smiley (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/SOLR-17378?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17868199#comment-17868199 ] 

David Smiley commented on SOLR-17378:
-------------------------------------

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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