Michael Gibney created SOLR-17378:
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Summary: 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
"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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