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https://issues.apache.org/jira/browse/FLINK-25833?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17487062#comment-17487062
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Chesnay Schepler commented on FLINK-25833:
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Ah you can just check the return value of
{{ClassLoader.registerAsParallelCapable()}}.
> FlinkUserCodeClassLoader is not registered as parallel capable
> --------------------------------------------------------------
>
> Key: FLINK-25833
> URL: https://issues.apache.org/jira/browse/FLINK-25833
> Project: Flink
> Issue Type: Bug
> Components: Runtime / Task
> Reporter: nicolasyang
> Priority: Minor
>
> A classloader can be registered as parallel capable only if all of its super
> classes are registered as parallel capable[1]. It must be registered to make
> ChildFirstClassLoader and ParentFirstClassLoader parallel capable.
> [1]
> https://docs.oracle.com/javase/8/docs/api/java/lang/ClassLoader.html#registerAsParallelCapable--
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