GJL commented on issue #9271: [FLINK-13384][1.9][runtime] Fix back pressure 
sampling for SourceStreamTask
URL: https://github.com/apache/flink/pull/9271#issuecomment-517350857
 
 
   Imo using 
   
   ```
   Thread.currentThread().setContextClassLoader(userCodeClassLoader)
   ```
   
   doesn't make the code more maintainable. Moreover, tests that currently call 
`Task#run()` directly can only break if we introduce this change (also note 
that we do not unset the context class loader). FLINK-13384 is a bug ticket, 
and I'd refrain from changing more behavior unless absolutely necessary. If a 
code restructuring/refactoring is needed, we can do it in a separate ticket.

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