dafeiw commented on issue #35928:
URL: https://github.com/apache/arrow/issues/35928#issuecomment-1579453403
It seems child allocator will ask parent allocator do allocation.
I have two child allocators. The first one has `Long.MAX_VALUE`
`initReservation`, second one has 0 as `initReservation`.
`rootAllocator.newChildAllocator("A", Long.MAX_VALUE, Long.MAX_VALUE)`
`rootAllocator.newChildAllocator("B", 0, Long.MAX_VALUE)`
```
if (beyondReservation > 0 && parent != null) {
// we need to get memory from our parent.
final long parentRequest = Math.min(beyondReservation, size);
parentOutcome = parent.allocate(parentRequest, updatePeak,
forceAllocation, details);
}
```
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