waynexia commented on code in PR #6590:
URL: https://github.com/apache/arrow-rs/pull/6590#discussion_r1810876731
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arrow-buffer/src/pool.rs:
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@@ -0,0 +1,79 @@
+use std::sync::atomic::{AtomicUsize, Ordering};
+use std::sync::Arc;
+
+/// A [`MemoryPool`] can be used to track memory usage by
[`Buffer`](crate::Buffer)
+pub trait MemoryPool {
+ fn register(&self, size: usize) -> Box<dyn MemoryReservation>;
+}
+
+/// A memory reservation within a [`MemoryPool`] that is freed on drop
+pub trait MemoryReservation {
+ fn resize(&mut self, new: usize);
Review Comment:
Mutable buffer might need this. It may resize its reservation dynamically
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