[ISSUE #1601]Optimize PopProcessQueue #1602
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Codecov ReportAttention: Patch coverage is
Additional details and impacted files@@ Coverage Diff @@
## main #1602 +/- ##
==========================================
+ Coverage 25.38% 25.49% +0.11%
==========================================
Files 459 459
Lines 60554 60609 +55
==========================================
+ Hits 15371 15453 +82
+ Misses 45183 45156 -27 ☔ View full report in Codecov by Sentry. |
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Actionable comments posted: 2
🧹 Outside diff range and nitpick comments (4)
rocketmq-client/src/consumer/consumer_impl/pop_process_queue.rs (4)
45-52: Refactor to eliminate redundantnewmethodThe
newmethod duplicates the functionality provided by theDefaultimplementation. It's more idiomatic in Rust to usePopProcessQueue::default()instead of defining a separatenewmethod with the same logic. Consider removing thenewmethod to avoid redundancy.Apply this diff to remove the
newmethod:impl PopProcessQueue { - pub(crate) fn new() -> Self { - PopProcessQueue { - last_pop_timestamp: get_current_millis(), - wait_ack_counter: Arc::new(AtomicUsize::new(0)), - dropped: Arc::new(AtomicBool::new(false)), - } - } // Existing methods... }Update instances where
PopProcessQueue::new()is called to usePopProcessQueue::default()instead.
99-108: Implement theDebugtrait for better debugging supportWhile the
Displaytrait is implemented, leveraging theDebugtrait is standard practice for structs, especially when using debugging tools or printing debug information.Implement the
Debugtrait as follows:impl std::fmt::Debug for PopProcessQueue { fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result { f.debug_struct("PopProcessQueue") .field("last_pop_timestamp", &self.last_pop_timestamp) .field("wait_ack_counter", &self.wait_ack_counter.load(Ordering::Relaxed)) .field("dropped", &self.dropped.load(Ordering::Relaxed)) .finish() } }
18-21: Simplify import statements for atomic typesConsolidate the import statements for atomic types for clarity and conciseness.
Replace:
use std::sync::atomic::AtomicBool; use std::sync::atomic::AtomicUsize; use std::sync::atomic::Ordering;With:
use std::sync::atomic::{AtomicBool, AtomicUsize, Ordering};
35-43: DelegateDefaultimplementation to existingnewmethodIf the
newmethod is retained, you can avoid code duplication by having theDefaultimplementation callnew.Modify the
Defaultimplementation:impl Default for PopProcessQueue { fn default() -> Self { - PopProcessQueue { - last_pop_timestamp: get_current_millis(), - wait_ack_counter: Arc::new(AtomicUsize::new(0)), - dropped: Arc::new(AtomicBool::new(false)), - } + Self::new() } }
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rocketmq-client/src/consumer/consumer_impl/pop_process_queue.rs(1 hunks)
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rocketmq-client/src/consumer/consumer_impl/pop_process_queue.rs (1)
116-168: Enhance unit tests to cover edge cases and concurrency
While the unit tests validate basic functionality, they don't cover edge cases or concurrency scenarios.
Consider adding tests for:
- Concurrent access: Simulate concurrent increments and decrements to
wait_ack_counterto ensure thread safety. - Underflow conditions: Test behavior when
dec_found_msgmight cause the counter to underflow. - Maximum counter value: Validate behavior when
wait_ack_counterapproachesusize::MAX.
rocketmq-client/src/consumer/consumer_impl/pop_process_queue.rs
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| pub(crate) fn dec_found_msg(&self, count: isize) { | ||
| self.wait_ack_counter | ||
| .fetch_add(-count as usize, Ordering::Relaxed); | ||
| } |
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Fix incorrect use of fetch_add with negative value
In the dec_found_msg method, using fetch_add(-count as usize, Ordering::Relaxed) is problematic. Casting a negative isize to usize doesn't yield a negative value, potentially causing underflow or unexpected behavior.
Modify the method to use fetch_sub, which correctly subtracts from the atomic unsigned integer:
pub(crate) fn dec_found_msg(&self, count: isize) {
- self.wait_ack_counter
- .fetch_add(-count as usize, Ordering::Relaxed);
+ self.wait_ack_counter
+ .fetch_sub(count as usize, Ordering::Relaxed);
}Ensure that count is non-negative to prevent unintended results.
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| pub(crate) fn dec_found_msg(&self, count: isize) { | |
| self.wait_ack_counter | |
| .fetch_add(-count as usize, Ordering::Relaxed); | |
| } | |
| pub(crate) fn dec_found_msg(&self, count: isize) { | |
| self.wait_ack_counter | |
| .fetch_sub(count as usize, Ordering::Relaxed); | |
| } |
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Actionable comments posted: 1
🧹 Outside diff range and nitpick comments (2)
rocketmq-client/src/consumer/consumer_impl/pop_process_queue.rs (2)
35-52: Consider reducing code duplication betweenDefaultandnewThe
new()method duplicates the exact same initialization as theDefaultimplementation. Consider implementing one in terms of the other.impl PopProcessQueue { pub(crate) fn new() -> Self { - PopProcessQueue { - last_pop_timestamp: get_current_millis(), - wait_ack_counter: Arc::new(AtomicUsize::new(0)), - dropped: Arc::new(AtomicBool::new(false)), - } + Self::default() } }
111-168: Consider adding more edge cases and concurrent testsWhile the current test coverage is good, consider adding:
- Concurrent access tests to verify thread safety
- Edge cases for message counter overflow
- Tests for negative count handling in dec_found_msg
Example concurrent test:
#[test] fn test_concurrent_operations() { use std::thread; let queue = Arc::new(PopProcessQueue::new()); let queue_clone = queue.clone(); let t1 = thread::spawn(move || { for _ in 0..1000 { queue_clone.inc_found_msg(1); queue_clone.dec_found_msg(1); } }); let t2 = thread::spawn(move || { for _ in 0..1000 { queue.ack(); } }); t1.join().unwrap(); t2.join().unwrap(); }
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rocketmq-client/src/consumer/consumer_impl/pop_process_queue.rs(1 hunks)
🔇 Additional comments (3)
rocketmq-client/src/consumer/consumer_impl/pop_process_queue.rs (3)
17-33: LGTM: Thread-safety improvements through atomic types
The change from bool to Arc<AtomicBool> for the dropped field and the use of Arc<AtomicUsize> for wait_ack_counter properly ensures thread-safe operations. This is a good optimization that prevents potential race conditions in concurrent scenarios.
99-109: LGTM: Well-structured Display implementation
The Display implementation provides a clear and informative string representation of the queue's state. The use of Relaxed ordering is appropriate here since this is for debugging/display purposes.
70-73:
Fix incorrect use of fetch_add with negative value
The issue with using fetch_add with a negative value cast to usize still exists.
pub(crate) fn dec_found_msg(&self, count: isize) {
- self.wait_ack_counter
- .fetch_add(-count as usize, Ordering::Relaxed);
+ self.wait_ack_counter
+ .fetch_sub(count as usize, Ordering::Relaxed);
}| pub(crate) fn is_dropped(&self) -> bool { | ||
| self.dropped.load(Ordering::Relaxed) | ||
| } | ||
|
|
||
| pub(crate) fn set_dropped(&self, dropped: bool) { | ||
| self.dropped.store(dropped, Ordering::Relaxed); | ||
| } |
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🛠️ Refactor suggestion
Consider stronger memory ordering for critical operations
The use of Ordering::Relaxed might be too weak for operations that affect the queue's state. Consider:
Ordering::Acquireforis_droppedandis_pull_expiredreadsOrdering::Releaseforset_droppedwrites
pub(crate) fn is_dropped(&self) -> bool {
- self.dropped.load(Ordering::Relaxed)
+ self.dropped.load(Ordering::Acquire)
}
pub(crate) fn set_dropped(&self, dropped: bool) {
- self.dropped.store(dropped, Ordering::Relaxed);
+ self.dropped.store(dropped, Ordering::Release);
}Also applies to: 93-96
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Which Issue(s) This PR Fixes(Closes)
Fixes #1601
Brief Description
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Summary by CodeRabbit
New Features
PopProcessQueuestruct with atomic operations for the dropped state.Defaultimplementation for easier initialization ofPopProcessQueue.Displayimplementation for improved formatted output of the struct.Bug Fixes
Tests
PopProcessQueuestruct.