houqp commented on a change in pull request #1691:
URL: https://github.com/apache/arrow-datafusion/pull/1691#discussion_r795000268
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File path: datafusion/src/execution/memory_manager.rs
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@@ -245,10 +245,10 @@ The memory management architecture is the following:
/// Manage memory usage during physical plan execution
#[derive(Debug)]
pub struct MemoryManager {
- requesters: Arc<Mutex<HashMap<MemoryConsumerId, Weak<dyn
MemoryConsumer>>>>,
- trackers: Arc<Mutex<HashMap<MemoryConsumerId, Weak<dyn MemoryConsumer>>>>,
+ requesters: Arc<Mutex<HashSet<MemoryConsumerId>>>,
pool_size: usize,
requesters_total: Arc<Mutex<usize>>,
Review comment:
never mind, I was wrong, considering the cv will reacquire the lock on
wake up, a mutex is needed if we need to make sure the woken up thread will not
be operating with a different `requesters_total` value.
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