Andrzej Bialecki created SOLR-11221:
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Summary: SolrJmxReporter may not report all metrics
Key: SOLR-11221
URL: https://issues.apache.org/jira/browse/SOLR-11221
Project: Solr
Issue Type: Bug
Security Level: Public (Default Security Level. Issues are Public)
Affects Versions: 6.6, 7.0, 6.7, master (8.0)
Reporter: Andrzej Bialecki
Assignee: Andrzej Bialecki
Priority: Critical
{{SolrJmxReporter}} uses Dropwizard's {{JmxReporter}}, which in turn uses a
{{MetricRegistry}} listener to report newly added metrics as MBeans, and to
unregister them from MBeanServer when the reporter is closed, which happens
when core is closed.
The metrics API keeps around existing metrics in {{solr.core.*}} registries to
help maintain continuous metrics in presence of core reloads. However, this
means that some of these metric instances are not registered anew when a core
is reloaded - and for these metrics the listener won't fire, so the MBeans
won't be registered.
This limitation is a result of the use of {{MetricRegistryListener}} in
{{JmxReporter}} and can't be fixed without reimplementing this class. Another
possible approach would be to configure the {{JmxReporter}} to use a
"mirroring" registry instead, which will be populated with existing metrics
from the original registry (thus generating "metric added" events) and then
kept in sync with the main registry via a listener.
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