Vikas Singh created KAFKA-9330:
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Summary: 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
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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