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https://issues.apache.org/jira/browse/KAFKA-9330?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jason Gustafson resolved KAFKA-9330.
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Fix Version/s: 2.5.0
Resolution: Fixed
> Calling AdminClient.close in the AdminClient completion callback causes
> deadlock
> --------------------------------------------------------------------------------
>
> Key: KAFKA-9330
> URL: https://issues.apache.org/jira/browse/KAFKA-9330
> Project: Kafka
> Issue Type: Bug
> Reporter: Vikas Singh
> Assignee: Vikas Singh
> Priority: Major
> Fix For: 2.5.0
>
>
> The close method calls `Thread.join` to wait for AdminClient thread to die,
> but that doesn't happen as the thread calling join is the AdminClient thread.
> This causes the thread to block forever, causing a deadlock where it forever
> waits for itself to die.
> `AdminClient.close` should check if the thread calling close is same as
> current thread, then skip the join. The thread will check for close condition
> in the main loop and exit.
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