[jira] [Created] (SOLR-14274) Multiple CoreContainers will register the same JVM Metrics

["Mike Drob (Jira)" <ji...@apache.org>]

Mike Drob created SOLR-14274:
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             Summary: Multiple CoreContainers will register the same JVM Metrics
                 Key: SOLR-14274
                 URL: https://issues.apache.org/jira/browse/SOLR-14274
             Project: Solr
          Issue Type: Bug
      Security Level: Public (Default Security Level. Issues are Public)
            Reporter: Mike Drob


When running multiple CoreContainer in the same JVM, either because we called {{SolrCloudTestCase.configureCluster(int n)}} with {{n > 1}} or because we have multiple tests running in the same JVM in succession, we will have contention on the shared JVM {{metricsRegistry}} as they each replace the existing metrics with their own. Further, with multiple nodes at the same time, some of these metrics will be incorrect anyway, since they will only reflect a single core container. Others will be fine since I think they are reading system-level information so it doesn't matter where it comes from.

I think this is a test-only issue, since the circumstances where somebody is running multiple core containers in a single JVM in production should be rare, but maybe there are edge cases affected with EmbeddedSolrServer and MapReduce or Spark, or other unusual deployment patterns.

Removing the metrics registration entirely can speed up {{configureCluster(100).build()}} on my machine from 2 minutes to 30 seconds, so I'm optimistic that there can be gains here without sacrificing the feature entirely.



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