[GitHub] [arrow] h-vetinari commented on issue #35728: BUG: `test_total_bytes_allocated` failing on arrow 12

["h-vetinari (via GitHub)" <gi...@apache.org>]

h-vetinari commented on issue #35728:
URL: https://github.com/apache/arrow/issues/35728#issuecomment-1560409997

   Thanks @assignUser for chiming in! Some more context. It did not appear for the last successful [build](https://github.com/conda-forge/arrow-cpp-feedstock/pull/1042) of 12.0.0, then appeared for a [migration](https://github.com/conda-forge/arrow-cpp-feedstock/pull/1053) (of simultaneously re2, aws-crt & google-cloud-cpp; because reasons...), but only on linux, and not for any of the older arrow versions (which received the same migrator PRs).
   
   > Single test failure here, and only on linux. Normally I'd go with a skip, but this looks like it might be leaking memory? Any ideas? The test in question [has no](https://github.com/apache/arrow/blob/apache-arrow-12.0.0/python/pyarrow/tests/test_array.py#L40-L41) comments or documentation AFAICS.
   > 
   > ```
   > =================================== FAILURES ===================================
   > __________________________ test_total_bytes_allocated __________________________
   > 
   >     def test_total_bytes_allocated():
   > >       assert pa.total_allocated_bytes() == 0
   > E       assert 1216 == 0
   > E        +  where 1216 = <built-in function total_allocated_bytes>()
   > E        +    where <built-in function total_allocated_bytes> = pa.total_allocated_bytes
   > ```
   > 
   > It's also interesting that this doesn't appear in any of the equivalent PRs to the maintenance branches, e.g. #1057.
   
   However, I've now restarted https://github.com/conda-forge/arrow-cpp-feedstock/pull/1053, and although I have no idea why, the failure seems to have disappeared! 🥳 
   
   I'm happy to close this issue (and apologise for the noise), unless people want to leave this open a bit longer to understand better what's happening with `test_total_bytes_allocated`. As I mentioned above, it's hard to tell for me (from lack of code comments/context) what this test is actually testing, under which conditions it may fail, and how serious that is if it happens.


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