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https://issues.apache.org/jira/browse/CASSANDRA-15975?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17164425#comment-17164425
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Jon Meredith commented on CASSANDRA-15975:
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|[PR\|[https://github.com/apache/cassandra/pull/691]] /
[Branch\|[https://github.com/jonmeredith/cassandra/tree/C-15975]]
[CircleCI\|[https://app.circleci.com/pipelines/github/jonmeredith/cassandra?branch=C-15975]]
- unit tests had an unrelated failure in
org.apache.cassandra.streaming.async.StreamingInboundHandlerTest|
> 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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