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https://issues.apache.org/jira/browse/PHOENIX-6699?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17529207#comment-17529207
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Istvan Toth commented on PHOENIX-6699:
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I could not find a simple way to detect if Phoenix is running inside an RS, so
instead I opted to use reflection to check that internal state of the Default
MetricsSystemImplementation object to see it has been initialized HBase before.
> Phoenix metrics overwriting DefaultMetricsSystem in RegionServers
> -----------------------------------------------------------------
>
> Key: PHOENIX-6699
> URL: https://issues.apache.org/jira/browse/PHOENIX-6699
> Project: Phoenix
> Issue Type: Bug
> Components: core
> Affects Versions: 5.2.0
> Reporter: Istvan Toth
> Assignee: Istvan Toth
> Priority: Major
>
> There is a race condition in the Hbase and Phoenix metrics handling.
> Hbase metrics is supposed to run in the daemon processes, while Phoenix
> metrics is supposed to run on the phoenix client side.
> On an RS both HBase and Phoenix tries to register its metrics implementation
> into DefaultMetricsSystem.
>
> On the happy path, when Phoenix tries to register its metrics on the RS, it
> won't have any effect, because HBase has already registered an active Metrics
> implementation.
> However, JmxCacheBuster stops the Hbase metrics system for ~500ms every five
> seconds, and if Phoenix tries to initialize its metrics in this period, then
> it will succeed in initializing its Metrics object, and will overwrite
> theDefaultMetricsSystem object initialized by HBase.
> This disables the HBase metrics system for the RS process.
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