[jira] [Created] (SOLR-10226) JMX metric avgTimePerRequest broken

["Bojan Smid (JIRA)" <ji...@apache.org>]

Bojan Smid created SOLR-10226:
---------------------------------

             Summary: JMX metric avgTimePerRequest broken
                 Key: SOLR-10226
                 URL: https://issues.apache.org/jira/browse/SOLR-10226
             Project: Solr
          Issue Type: Bug
      Security Level: Public (Default Security Level. Issues are Public)
          Components: metrics
    Affects Versions: 6.4.1
            Reporter: Bojan Smid


JMX Metric avgTimePerRequest (of org.apache.solr.handler.component.SearchHandler) doesn't appear to behave correctly anymore. It was a cumulative value in pre-6.4 versions. Since totalTime metric was removed (which was a base for monitoring calculations), avgTimePerRequest seems like possible alternative to calculate "time spent in requests since last measurement", but it behaves strangely after 6.4.

I did a simple test on gettingstarted collection (just unpacked the Solr 6.4.1 version and started it with "bin/solr start -e cloud -noprompt"). The query I used was:
http://localhost:8983/solr/gettingstarted/select?indent=on&q=*:*&wt=json
I run it 30 times in a row (with approx 1 sec between executions).

At the same time I was looking (with jconsole) at bean solr/gettingstarted_shard2_replica2:type=/select,id=org.apache.solr.handler.component.SearchHandler

Here is how metric was changing over time (first number is "requests" metric, second number is "avgTimePerRequest"):
10   6.6033
12   5.9557
13   0.9015    ---> 13th req would need negative duration if this was cumulative
15   6.7315
16   7.4873
17   0.8458    ---> same case with 17th request
23   6.1076

At the same time bean solr/gettingstarted_shard1_replica2:type=/select,id=org.apache.solr.handler.component.SearchHandler  also showed strange values:
6    5.13482
8    10.5694
9    0.504
10  0.344
12  8.8121
18  3.3531



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