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https://issues.apache.org/jira/browse/ARTEMIS-351?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15106718#comment-15106718
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ASF GitHub Bot commented on ARTEMIS-351:
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Github user tomjenkinson commented on the pull request:
https://github.com/apache/activemq-artemis/pull/326#issuecomment-172857600
squished thanks
> Report an Exception if a journal file cannot be created rather than blocking
> forever
> ------------------------------------------------------------------------------------
>
> Key: ARTEMIS-351
> URL: https://issues.apache.org/jira/browse/ARTEMIS-351
> Project: ActiveMQ Artemis
> Issue Type: Improvement
> Reporter: Tom Jenkinson
>
> The architecture of the journal component is such that the next journal file
> to create fails (executed async) then the application thread will block
> forever in an append call and the journal will become unusable during that
> JVM execution.
> The error was reported as a warning but the loop is not broken out of after a
> recent change (ARTEMIS-321), a callback IO handler will now be invoked and
> the business logic can elect to make a decision such as shutdown.
> However, if you know that the error may be transient, unless this callback
> throws an unhandled exception the journal will remain blocked forever. Even
> if an unhandled exception is thrown from your handler to unblock the thread,
> there is an issue in that subsequent calls to appendRecord will add the file
> name into the queue of files to create every time it is invoked. This can
> easily result in the same file name appearing twice in the queue. Once this
> happens, the logic to check if a record does not fit in the current file then
> it will fit in the next file triggers and an exception is thrown.
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