[jira] [Created] (KAFKA-7956) Avoid blocking in ShutdownableThread.awaitShutdown if the thread has not been started

["Gardner Vickers (JIRA)" <ji...@apache.org>]

Gardner Vickers created KAFKA-7956:
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             Summary: Avoid blocking in ShutdownableThread.awaitShutdown if the thread has not been started
                 Key: KAFKA-7956
                 URL: https://issues.apache.org/jira/browse/KAFKA-7956
             Project: Kafka
          Issue Type: Improvement
          Components: core
            Reporter: Gardner Vickers


Opening this Jira to track [https://github.com/apache/kafka/pull/6218], since it's a rather subtle change.

In some test cases it's desirable to instantiate a subclass of `ShutdownableThread` without starting it. Since most subclasses of `ShutdownableThread` put cleanup logic in `ShutdownableThread.shutdown()`, being able to call `shutdown()` on the non-running thread would be useful.

This change allows us to avoid blocking in `ShutdownableThread.shutdown()` if the thread's `run()` method has not been called. We also add a check that `initiateShutdown()` was called before `awaitShutdown()`, to protect against the case where a user calls `awaitShutdown()` before the thread has been started, and unexpectedly is not blocked on the thread shutting down. 

 



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