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Posted to issues@flink.apache.org by "Ruan Hang (Jira)" <ji...@apache.org> on 2025/11/10 02:05:00 UTC

[jira] [Updated] (FLINK-34670) The asyncOperationsThreadPool in SubtaskCheckpointCoordinatorImpl can only create one worker thread

     [ https://issues.apache.org/jira/browse/FLINK-34670?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Ruan Hang updated FLINK-34670:
------------------------------
    Fix Version/s: 2.3.0
                       (was: 2.2.0)

> 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: 2.1.0
>            Reporter: Jinzhong Li
>            Priority: Critical
>              Labels: pull-request-available
>             Fix For: 2.3.0
>
>         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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