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https://issues.apache.org/jira/browse/FLINK-34670?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17831334#comment-17831334
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Jinzhong Li commented on FLINK-34670:
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[~roman] [~pnowojski] I think this is a critical bug that will result in
concurrent checkpoints being forced to execute sequentially, as well as causing
a drastic performance regression of checkpoint aborts. Could you please take a
look at it?
> The asyncOperationsThreadPool in SubtaskCheckpointCoordinatorImpl can only
> create one worker thread
> ---------------------------------------------------------------------------------------------------
>
> Key: FLINK-34670
> URL: https://issues.apache.org/jira/browse/FLINK-34670
> Project: Flink
> Issue Type: Bug
> Components: Runtime / Checkpointing, Runtime / State Backends
> Affects Versions: 1.18.0, 1.19.0
> Reporter: Jinzhong Li
> Priority: Critical
> Labels: pull-request-available
> Fix For: 1.20.0
>
> Attachments: image-2024-03-14-20-24-14-198.png,
> image-2024-03-14-20-27-37-540.png, image-2024-03-14-20-33-28-851.png
>
>
> Now, the asyncOperations ThreadPoolExecutor of
> SubtaskCheckpointCoordinatorImpl is create with a LinkedBlockingQueue and
> zero corePoolSize.
> !image-2024-03-14-20-24-14-198.png|width=614,height=198!
> And in the ThreadPoolExecutor, except for the first time the task is
> submitted, *no* new thread is created until the queue is full. But the
> capacity of LinkedBlockingQueue is Integer.Max. This means that there is
> almost *only one thread* working in this thread pool, *even if* {*}there are
> many concurrent checkpoint requests or checkpoint abort requests waiting to
> be processed{*}.
> !image-2024-03-14-20-27-37-540.png|width=614,height=175!
> This problem can be verified by changing ExecutorService implementation in UT
> SubtaskCheckpointCoordinatorTest#testNotifyCheckpointAbortedDuringAsyncPhase.
> When the LinkedBlockingQueue and zero corePoolSize are configured, this UT
> will deadlock because only one worker thread can be created.
> !image-2024-03-14-20-33-28-851.png|width=606,height=235!
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