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https://issues.apache.org/jira/browse/PHOENIX-6687?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jacob Isaac reassigned PHOENIX-6687:
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Assignee: Jacob Isaac
> The region server hosting the SYSTEM.CATALOG fails to serve any metadata
> requests as default handler pool threads are exhausted.
> ---------------------------------------------------------------------------------------------------------------------------------
>
> Key: PHOENIX-6687
> URL: https://issues.apache.org/jira/browse/PHOENIX-6687
> Project: Phoenix
> Issue Type: Bug
> Components: core
> Affects Versions: 5.1.0, 5.1.1, 4.16.1, 5.2.0, 5.1.2
> Reporter: Jacob Isaac
> Assignee: Jacob Isaac
> Priority: Major
> Fix For: 4.17.0, 5.2.0
>
> Attachments: stacktraces.txt
>
>
> When SYSTEM.CATALOG region server is restarted and the server is experiencing
> heavy metadata call volume.
> The stack traces indicate that all the default handler pool threads are
> waiting for the CQSI.init thread to finish initializing.
> The CQSI.init thread itself cannot proceed since it cannot complete the
> second RPC call
> (org.apache.phoenix.query.ConnectionQueryServicesImpl.checkClientServerCompatibility)
> due to thread starvation.
> For e.g
> The following
> [code|https://github.com/apache/phoenix/blob/3cff97087d79b85e282fca4ac69ddf499fb1f40f/phoenix-core/src/main/java/org/apache/phoenix/coprocessor/MetaDataEndpointImpl.java#L661]
> turned the getTable(..) into needing an additional server-to-server RPC call
> when initializing a PhoenixConnection (CQSI.init) for the first time on the
> JVM.
> It is well-known that server-to-server RPC calls are prone to deadlocking due
> to thread pool exhaustion.
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