wiedld commented on code in PR #11665:
URL: https://github.com/apache/datafusion/pull/11665#discussion_r1697608547
##########
datafusion/execution/src/memory_pool/pool.rs:
##########
@@ -240,6 +249,149 @@ fn insufficient_capacity_err(
resources_datafusion_err!("Failed to allocate additional {} bytes for {}
with {} bytes already allocated - maximum available is {}", additional,
reservation.registration.consumer.name, reservation.size, available)
}
+/// A [`MemoryPool`] that tracks the consumers that have
+/// reserved memory within the inner memory pool.
+///
+/// Tracking is per hashed [`MemoryConsumer`], not per [`MemoryReservation`].
+/// The same consumer can have multiple reservations.
+#[derive(Debug)]
+pub struct TrackConsumersPool<I> {
+ inner: I,
+ top: NonZeroUsize,
+ tracked_consumers: Mutex<HashMap<MemoryConsumer, AtomicU64>>,
+}
+
+impl<I: MemoryPool> TrackConsumersPool<I> {
+ /// Creates a new [`TrackConsumersPool`].
+ ///
+ /// The `top` determines how many Top K [`MemoryConsumer`]s to include
+ /// in the reported [`DataFusionError::ResourcesExhausted`].
+ pub fn new(inner: I, top: NonZeroUsize) -> Self {
+ Self {
+ inner,
+ top,
+ tracked_consumers: Default::default(),
+ }
+ }
+
+ /// Determine if there are multiple [`MemoryConsumer`]s registered
+ /// which have the same name.
+ ///
+ /// This is very tied to the implementation of the memory consumer.
+ fn has_multiple_consumers(&self, name: &String) -> bool {
+ let consumer = MemoryConsumer::new(name);
+ let consumer_with_spill = consumer.clone().with_can_spill(true);
+ let guard = self.tracked_consumers.lock();
+ guard.contains_key(&consumer) &&
guard.contains_key(&consumer_with_spill)
+ }
+
+ /// The top consumers in a report string.
+ fn report_top(&self) -> String {
Review Comment:
The use of TrackConsumersPool for error reporting (when passed as `Arc<dyn
MemoryPool>`) is constrained by the trait definition. However, we could use the
downcasted struct itself for runtime metrics [as shown in this added
commit](https://github.com/apache/datafusion/pull/11665/commits/c8c01961dd54df1703d7efdf216a8f63db8656b4).
Is this what you were thinking?
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