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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