zhztheplayer commented on a change in pull request #7030:
URL: https://github.com/apache/arrow/pull/7030#discussion_r563299997
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File path: cpp/src/arrow/memory_pool.h
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@@ -149,6 +149,43 @@ class ARROW_EXPORT ProxyMemoryPool : public MemoryPool {
std::unique_ptr<ProxyMemoryPoolImpl> impl_;
};
+class ARROW_EXPORT ReservationListener {
+ public:
+ virtual ~ReservationListener();
+
+ virtual Status OnReservation(int64_t size) = 0;
+ virtual Status OnRelease(int64_t size) = 0;
+
+ protected:
+ ReservationListener();
+};
+
+class ARROW_EXPORT ReservationListenableMemoryPool : public MemoryPool {
Review comment:
@pitrou Here is a previous discussion about "reserve" bytes from
Bits.java before the actual allocation
https://github.com/apache/arrow/pull/7030#issuecomment-679355309. "pre-reserve"
does not actually allocate memory but call a customized listener to reserve
from other resource managers such as JVM native memory, for other examples,
Spark or Yarn or something.
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