[ISSUE #1269]⚡️Optimize name server DefaultRequestProcessor#process_register_broker #1274
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WalkthroughThe changes in this pull request involve modifications to several components of the RocketMQ codebase, primarily focusing on optimizing the Changes
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Codecov ReportAttention: Patch coverage is
Additional details and impacted files@@ Coverage Diff @@
## main #1274 +/- ##
==========================================
- Coverage 18.98% 18.98% -0.01%
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Files 428 428
Lines 53842 53846 +4
==========================================
Hits 10224 10224
- Misses 43618 43622 +4 ☔ View full report in Codecov by Sentry. 🚨 Try these New Features:
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Actionable comments posted: 1
🧹 Outside diff range and nitpick comments (6)
rocketmq-remoting/src/protocol/route/route_data_view.rs (1)
84-87: Consider adding documentation for the enable_acting_master functionality.Since this field affects broker behavior in a distributed system context, it would be helpful to add documentation comments explaining:
- The purpose and impact of enable_acting_master
- When and why it should be enabled/disabled
- Any implications for broker election or failover scenarios
Example documentation:
+ /// Sets whether this broker can act as a master. + /// + /// # Arguments + /// + /// * `enable_acting_master` - When true, allows this broker to participate in master election + /// #[inline] pub fn set_enable_acting_master(&mut self, enable_acting_master: bool) { self.enable_acting_master = enable_acting_master; }rocketmq-namesrv/src/processor/default_request_processor.rs (1)
228-228: LGTM! Good optimization.The direct clone of
filter_server_listsimplifies the code while maintaining the same functionality. This change eliminates unnecessary iterator overhead.Consider adding a brief comment explaining the version check's significance:
if broker_version as usize >= RocketMqVersion::V3011 as usize { + // V3.0.11+ brokers support filter servers and enhanced topic configs let register_broker_body = extract_register_broker_body_from_request(&request, &request_header);rocketmq-namesrv/src/route/route_info_manager.rs (4)
86-86: Consider using per-structure locks instead of a global lockThe introduction of a global
RwLock(lock: Arc<parking_lot::RwLock<()>>) in theRouteInfoManagerstruct (lines 86 and 104) may lead to contention and reduced concurrency, as it serializes all write access through a single lock. To improve performance, consider wrapping each shared mutable data structure (e.g.,topic_queue_table,broker_addr_table, etc.) with its ownRwLockorMutex. This allows more fine-grained locking and can enhance concurrent access to these structures.Also applies to: 104-104
Line range hint
112-157: Unsafe use ofmut_from_ref()violates Rust's borrowing rulesIn the
register_brokermethod (lines 112-157),mut_from_ref()is used to obtain mutable references from immutable ones. This bypasses Rust's borrowing and mutability rules, potentially leading to undefined behavior and data races. Rust's safety guarantees rely on enforcing strict aliasing rules, and circumventing them can compromise thread safety.To address this issue, wrap the shared data structures with appropriate synchronization primitives that provide interior mutability safely. For example, you can wrap each mutable data structure in
Arc<RwLock<...>>and modify your code to acquire write locks when mutating:-let _write = self.lock.write(); -self.cluster_addr_table - .mut_from_ref() +let mut cluster_addr_table = self.cluster_addr_table.write(); +cluster_addr_table .entry(cluster_name.clone()) .or_default() .insert(broker_name.clone());Repeat this pattern for other shared data structures accessed within the method.
Line range hint
112-157: Reassess changing method signatures from&mut selfto&selfChanging the method signature of
register_brokerfrom&mut selfto&self(line 112) while performing mutations can lead to unsafe code if not properly synchronized. If the method mutates the state of the struct, it should either accept&mut selfor use synchronization primitives that safely allow interior mutability, such asRwLockorMutex.Ensure that any method mutating shared state either:
- Maintains
&mut selfif thread safety is not a concern, or- Uses synchronization primitives to safely handle concurrent mutations.
Adjust the method signature and internal logic accordingly to uphold Rust's safety guarantees.
86-86: Potential performance bottleneck due to global lockingEmploying a single global
RwLockfor the entireRouteInfoManager(lines 86 and 104) can create a performance bottleneck, as it forces all write operations to occur sequentially. This can limit scalability in a concurrent environment.Consider implementing more granular locking by associating locks with individual data structures. This allows different parts of the system to operate concurrently, thus improving performance.
Also applies to: 104-104
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📒 Files selected for processing (3)
rocketmq-namesrv/src/processor/default_request_processor.rs(1 hunks)rocketmq-namesrv/src/route/route_info_manager.rs(18 hunks)rocketmq-remoting/src/protocol/route/route_data_view.rs(1 hunks)
🔇 Additional comments (1)
rocketmq-remoting/src/protocol/route/route_data_view.rs (1)
84-87: LGTM! Clean implementation of the setter method.
The new setter method is well-implemented with proper mutability constraints and follows the existing code style. The #[inline] attribute is appropriate for this simple setter method.
Let's verify how this new setter is being used in the codebase:
✅ Verification successful
Setter implementation is correctly used in the codebase
The setter is properly used in route_info_manager.rs during broker registration to manage the acting master state. The implementation aligns with the PR's thread safety objectives, as it's used within mutable contexts and integrates with the broker registration flow.
Key usage points:
- Used in
RouteInfoManagerwhen processing broker registrations - Properly handles the default case with
enable_acting_master.unwrap_or_default() - Setter is called in both update and new broker registration paths
- The value affects broker permissions and write operations as seen in multiple condition checks
🏁 Scripts executed
The following scripts were executed for the analysis:
Script:
#!/bin/bash
# Description: Find usages of enable_acting_master field and the new setter
# to understand the optimization context
# Search for enable_acting_master field usage
echo "=== Field Usage ==="
rg "enable_acting_master" -A 2 -B 2
# Search for the new setter method usage
echo "=== Setter Usage ==="
rg "set_enable_acting_master" -A 2 -B 2
Length of output: 12618
| .mut_from_ref() | ||
| .entry(cluster_name.clone()) | ||
| .or_default() | ||
| .insert(broker_name.clone()); | ||
|
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||
| let enable_acting_master_inner = enable_acting_master.unwrap_or_default(); | ||
| let mut register_first = | ||
| if let Some(broker_data) = self.broker_addr_table.get_mut(&broker_name) { | ||
| broker_data.set_enable_acting_master(enable_acting_master_inner); | ||
| broker_data.set_zone_name(zone_name.clone()); | ||
| false | ||
| } else { | ||
| let mut broker_data = BrokerData::new( | ||
| cluster_name.clone(), | ||
| broker_name.clone(), | ||
| HashMap::new(), | ||
| zone_name, | ||
| ); | ||
| broker_data.set_enable_acting_master(enable_acting_master_inner); | ||
| self.broker_addr_table | ||
| .insert(broker_name.clone(), broker_data); | ||
| true | ||
| }; | ||
| let broker_data = self.broker_addr_table.get_mut(&broker_name).unwrap(); | ||
| let mut register_first = if let Some(broker_data) = | ||
| self.broker_addr_table.mut_from_ref().get_mut(&broker_name) | ||
| { | ||
| broker_data.set_enable_acting_master(enable_acting_master_inner); | ||
| broker_data.set_zone_name(zone_name.clone()); | ||
| false | ||
| } else { | ||
| let mut broker_data = BrokerData::new( | ||
| cluster_name.clone(), | ||
| broker_name.clone(), | ||
| HashMap::new(), | ||
| zone_name, | ||
| ); | ||
| broker_data.set_enable_acting_master(enable_acting_master_inner); | ||
| self.broker_addr_table | ||
| .mut_from_ref() | ||
| .insert(broker_name.clone(), broker_data); | ||
| true | ||
| }; | ||
| let broker_data = self | ||
| .broker_addr_table | ||
| .mut_from_ref() | ||
| .get_mut(&broker_name) |
There was a problem hiding this comment.
Use of mut_from_ref() undermines Rust's safety guarantees
Throughout the code (e.g., lines 129-157, 254-269, 550-587), mut_from_ref() is used to obtain mutable references from shared references. This practice violates Rust's mutability and borrowing principles, potentially causing undefined behavior and concurrency issues.
Refactor the code to use safe interior mutability patterns. Wrap each mutable data structure in Arc<RwLock<...>> and acquire the necessary locks when accessing them:
-self.broker_addr_table
- .mut_from_ref()
+let mut broker_addr_table = self.broker_addr_table.write();
+broker_addr_table
.get_mut(&broker_name)
.unwrap();Ensure that all mutations occur while holding the appropriate lock to maintain thread safety.
Also applies to: 254-269, 550-587
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Which Issue(s) This PR Fixes(Closes)
Fixes #1269
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Release Notes
New Features
enable_acting_masterfield in the BrokerData struct for enhanced configuration flexibility.Improvements
Bug Fixes