[jira] [Resolved] (KAFKA-9330) Calling AdminClient.close in the AdminClient completion callback causes deadlock

["Jason Gustafson (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/KAFKA-9330?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

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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