ferenc-csaky commented on PR #25955:
URL: https://github.com/apache/flink/pull/25955#issuecomment-2605094044

   After I rethink it again, it should probably be not enabled here, because 
the test should verify the `flink-runtime` shuffle memory allocation, which was 
on Netty4 back in 2019 as well when it was originally implemented, so it used 
the `pooled` allocator since ever.
   
   Enabling reflection only seemed to stabilize the test on my machine, but 
since this test was flaky on the CI failed sporadically, and on my machine 
consistently, it may not add much. My concern about the backported commit from 
`master` is that it gives 90MB memory instead of 7. It states `one chunk (4M * 
20) plus some margins`, which might be true for `master` if there were some 
other changes how we (did not follow this up), but definitely not true for 1.19 
and 1.20, so IMO it invalidates this test case.


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