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https://issues.apache.org/jira/browse/SOLR-11221?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16125547#comment-16125547
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ASF subversion and git services commented on SOLR-11221:
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Commit ff8b90b9acb7685a77d3b4af14f18aedb681176f in lucene-solr's branch
refs/heads/master from [~ab]
[ https://git-wip-us.apache.org/repos/asf?p=lucene-solr.git;h=ff8b90b ]
SOLR-11221: Fix precommit issues.
> SolrJmxReporter broken on core reload
> -------------------------------------
>
> 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)
> Components: metrics
> Affects Versions: 6.6, 7.0, 6.7, master (8.0)
> Reporter: Andrzej Bialecki
> Assignee: Andrzej Bialecki
> Priority: Critical
> Attachments: SOLR-11221.patch
>
>
> {{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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