1u0 commented on issue #9271: [FLINK-13384][1.9][runtime] Fix back pressure sampling for SourceStreamTask URL: https://github.com/apache/flink/pull/9271#issuecomment-517320819 > @1u0 Why is your solution better? Now the `LegacySourceFunctionThread` field can be `final`, and we can always return a non empty `Optional<Thread>` from `SourceStreamTask#getExecutingThread()`. Not being able to access the user class loader in the constructor but in `invoke` is also strange. I assumed that instantiation of `invokable` (StreamTask) has different, more loose contract (not requiring `userCodeClassLoader` set). It's also a little bit misleading that `Task.doRun()` calls `executingThread.setContextClassLoader(userCodeClassLoader)` where in fact the `executingThread == Thread.currentThread()`.
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