yjshen commented on code in PR #2135:
URL: https://github.com/apache/arrow-datafusion/pull/2135#discussion_r841628602
##########
datafusion/core/src/execution/memory_manager.rs:
##########
@@ -342,8 +349,8 @@ impl MemoryManager {
// if we cannot acquire at lease 1/2n memory, just wait for
others
// to spill instead spill self frequently with limited total
mem
debug!(
- "Cannot acquire minimum amount of memory {} on memory
manager {}, waiting for others to spill ...",
- human_readable_size(min_per_rqt), self);
+ "Cannot acquire a minimum amount of {} memory from the
manager of total {}, waiting for others to spill ...",
Review Comment:
The second fix: stop calling std::fmt::Display on memory manager since it's
acquiring a lock we are already holding.
##########
datafusion/core/src/execution/memory_manager.rs:
##########
@@ -378,6 +403,8 @@ impl MemoryManager {
let mut total = self.requesters_total.lock();
assert!(*total >= mem_used);
*total -= mem_used;
+ self.cv.notify_all();
+ return;
Review Comment:
The third fix: stop releasing memory twice for requesters.
##########
datafusion/core/src/physical_plan/sorts/sort.rs:
##########
@@ -169,13 +169,19 @@ impl ExternalSorter {
tracking_metrics,
);
// Report to the memory manager we are no longer using memory
- self.metrics.mem_used().set(0);
+ self.free_all_memory();
result
} else {
Ok(Box::pin(EmptyRecordBatchStream::new(self.schema.clone())))
}
}
+ fn free_all_memory(&self) -> usize {
+ let used = self.metrics.mem_used().set(0);
+ self.shrink(used);
Review Comment:
The first fix, return all memory to the manager.
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