[jira] [Commented] (FLINK-24515) MailboxExecutor#submit swallows exceptions

["Piotr Nowojski (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/FLINK-24515?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17427752#comment-17427752 ] 

Piotr Nowojski commented on FLINK-24515:
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I think it's intentional "feature" and not a bug, that mimics {{ExecutorService#submit(...)}} interface. I'm not sure, but I think I was even copying this behaviour from some another executor service in Flink? Anyway, for this reason we added {{execute()}} methods with {{RunnableWithException}} (I think it happened in this FLINK-14935 ticket?).

> MailboxExecutor#submit swallows exceptions
> ------------------------------------------
>
>                 Key: FLINK-24515
>                 URL: https://issues.apache.org/jira/browse/FLINK-24515
>             Project: Flink
>          Issue Type: Bug
>          Components: Runtime / Task
>    Affects Versions: 1.14.0, 1.12.5, 1.13.2
>            Reporter: Dawid Wysakowicz
>            Assignee: Dawid Wysakowicz
>            Priority: Critical
>              Labels: pull-request-available
>             Fix For: 1.12.6, 1.13.3, 1.15.0, 1.14.1
>
>
> If a {{RunnableWithException}}/{{Callable}} is submitted via the {{MailboxExecutor#submit}} any exceptions thrown from it will be swallowed.
> It is caused by the {{FutureTaskWithException}} implementation. The {{FutureTask#run}} does not throw an exception, but it sets it as its internal state. The exception will be thrown only when {{FutureTask#get()}} is called.



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