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https://issues.apache.org/jira/browse/CASSANDRA-15975?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17411272#comment-17411272
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Benjamin Lerer commented on CASSANDRA-15975:
--------------------------------------------

[~jmeredithco] This ticket look ready to commit. Anything blocking you ?

> SEP.shutdownAndWait does not wait for termination and 
> SEPExecutor.awaitTermination may hang
> -------------------------------------------------------------------------------------------
>
>                 Key: CASSANDRA-15975
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-15975
>             Project: Cassandra
>          Issue Type: Bug
>          Components: Local/Other
>            Reporter: Jon Meredith
>            Assignee: Jon Meredith
>            Priority: Normal
>
> SharedExecutorPool.shutdownAndWait calls shutdownNow on the executors it 
> owns, which has the side effect of removing the executor from the list, then 
> uses the same emptied list to try and wait for them to complete shutting 
> down, which completes immediately.
>  
> Once fixed by copying the list in SEP.shutdownAndWait, the SEPExecutorTest 
> suite fails with a timeout due to a startup race in SEPWorker.
>  
> If a SEPExecutor is shutdown immediately after maybeSchedule creates a new 
> SEPWorker,
> but before it is able to execute the first task then it exits immediately on 
> entering the work loop with a work and task permit reserved for it, which 
> invalidates the work/task permit accounting and prevents calling the shutdown 
> SimpleCondition.signalAll when the last SEPWorker exits.



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