2010YOUY01 commented on PR #15610:
URL: https://github.com/apache/datafusion/pull/15610#issuecomment-2812536781
> tested my fuzz tests with this pr and all of them are failing currently
Update: I think the failure is not due to this PR's implementation, instead
it's caused by `FairMemoryPool`'s limitation.
After manually setting `max_spill_merge_degree` to 2, first 3 tests passed,
the 4th one failed with
```
Error: ResourcesExhausted("Additional allocation failed with top memory
consumers (across reservations) as: mock_memory_consumer#2(can spill: false)
consumed 1695480 bytes, ExternalSorterMerge[0]#1(can spill: false) consumed
401664 bytes. Error: Failed to allocate additional 297024 bytes for
ExternalSorterMerge[0] with 0 bytes already allocated for this reservation - 8
bytes remain available for the total pool
```
I believe it's the limitation of `FairSpillPool` that non-spillable
consumers are not able to back off, and it can block spilling consumers from
normal execution. (and this specific test is also possible to pass due to some
complex interactions if the runtime memory consumers are set up differently)
I'll try to come up with a minimal reproducer later.
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