Added sync.RWMutex to ConsistentHashRing struct for thread-safe concurrent access
Write operations (AddNode, RemoveNode) use exclusive locks (Lock/Unlock)
Read operations (GetNode, GetNodes, IsEmpty) use shared locks (RLock/RUnlock)
Impact
This prevents race conditions when multiple goroutines access the hash ring concurrently, which is critical for cluster membership changes happening alongside key lookups.
Test Plan
All existing tests pass
Tests pass with -race flag enabled (race detector)
Closes #35
## Summary
- Added `sync.RWMutex` to `ConsistentHashRing` struct for thread-safe concurrent access
- Write operations (`AddNode`, `RemoveNode`) use exclusive locks (`Lock`/`Unlock`)
- Read operations (`GetNode`, `GetNodes`, `IsEmpty`) use shared locks (`RLock`/`RUnlock`)
## Impact
This prevents race conditions when multiple goroutines access the hash ring concurrently, which is critical for cluster membership changes happening alongside key lookups.
## Test Plan
- [x] All existing tests pass
- [x] Tests pass with `-race` flag enabled (race detector)
- Add sync.RWMutex to ConsistentHashRing struct
- Use Lock/Unlock for write operations (AddNode, RemoveNode)
- Use RLock/RUnlock for read operations (GetNode, GetNodes, IsEmpty)
This allows concurrent reads (the common case) while serializing writes,
preventing race conditions when multiple goroutines access the hash ring.
Closes#35
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
This PR adds mutex protection to ConsistentHashRing for thread safety, addressing Issue #35.
Analysis
Positive aspects:
Correct lock granularity: Uses RWMutex with RLock for read operations (GetNode, GetNodes, IsEmpty) and Lock for write operations (AddNode, RemoveNode).
Complete coverage: All public methods that access shared state are protected. The private hash method correctly does not have its own lock since it is only called from within already-locked sections.
Consistent use of defer: All lock/unlock pairs use defer, ensuring locks are released even if early returns or panics occur.
No deadlock risk: The implementation does not call any external code while holding locks.
Tests pass with race detector: go test -race ./cluster/... passes.
Verdict
APPROVED - The implementation is correct, follows Go best practices for mutex usage, and addresses the issue requirements.
## Code Review for PR #40
### Summary
This PR adds mutex protection to ConsistentHashRing for thread safety, addressing Issue #35.
### Analysis
**Positive aspects:**
1. **Correct lock granularity**: Uses RWMutex with RLock for read operations (GetNode, GetNodes, IsEmpty) and Lock for write operations (AddNode, RemoveNode).
2. **Complete coverage**: All public methods that access shared state are protected. The private hash method correctly does not have its own lock since it is only called from within already-locked sections.
3. **Consistent use of defer**: All lock/unlock pairs use defer, ensuring locks are released even if early returns or panics occur.
4. **No deadlock risk**: The implementation does not call any external code while holding locks.
5. **Tests pass with race detector**: go test -race ./cluster/... passes.
### Verdict
APPROVED - The implementation is correct, follows Go best practices for mutex usage, and addresses the issue requirements.
This PR adds mutex protection to ConsistentHashRing for thread safety, addressing Issue #35.
Analysis
What was reviewed:
cluster/hashring.go - added sync.RWMutex and appropriate locking
Positive aspects:
Correct lock granularity: Uses RWMutex with RLock for read operations (GetNode, GetNodes, IsEmpty) and Lock for write operations (AddNode, RemoveNode). This allows concurrent reads while serializing writes - the optimal pattern for this use case.
Complete coverage: All public methods that access shared state are protected. The private hash method correctly does not have its own lock since it's only called from within already-locked sections.
Consistent use of defer: All lock/unlock pairs use defer, ensuring locks are released even if early returns or panics occur.
No deadlock risk: The implementation doesn't call any external code while holding locks, minimizing deadlock risk.
Tests pass with race detector: go test -race ./cluster/... passes.
Minor suggestions for future improvement (not blockers):
Concurrent stress tests: The existing tests don't specifically test concurrent access patterns. Consider adding a test that spawns multiple goroutines doing concurrent adds/removes/gets to validate thread safety under load.
Newline at EOF: Good - the newline at end of file was added (the old file was missing it).
Verdict
APPROVED - The implementation is correct, follows Go best practices for mutex usage, and addresses the issue requirements. All tests pass with the race detector enabled.
## Code Review for PR #40
### Summary
This PR adds mutex protection to `ConsistentHashRing` for thread safety, addressing Issue #35.
### Analysis
**What was reviewed:**
- `cluster/hashring.go` - added `sync.RWMutex` and appropriate locking
**Positive aspects:**
1. **Correct lock granularity**: Uses `RWMutex` with `RLock` for read operations (`GetNode`, `GetNodes`, `IsEmpty`) and `Lock` for write operations (`AddNode`, `RemoveNode`). This allows concurrent reads while serializing writes - the optimal pattern for this use case.
2. **Complete coverage**: All public methods that access shared state are protected. The private `hash` method correctly does not have its own lock since it's only called from within already-locked sections.
3. **Consistent use of defer**: All lock/unlock pairs use `defer`, ensuring locks are released even if early returns or panics occur.
4. **No deadlock risk**: The implementation doesn't call any external code while holding locks, minimizing deadlock risk.
5. **Tests pass with race detector**: `go test -race ./cluster/...` passes.
**Minor suggestions for future improvement (not blockers):**
1. **Concurrent stress tests**: The existing tests don't specifically test concurrent access patterns. Consider adding a test that spawns multiple goroutines doing concurrent adds/removes/gets to validate thread safety under load.
2. **Newline at EOF**: Good - the newline at end of file was added (the old file was missing it).
### Verdict
**APPROVED** - The implementation is correct, follows Go best practices for mutex usage, and addresses the issue requirements. All tests pass with the race detector enabled.
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Closes #35
Summary
sync.RWMutextoConsistentHashRingstruct for thread-safe concurrent accessAddNode,RemoveNode) use exclusive locks (Lock/Unlock)GetNode,GetNodes,IsEmpty) use shared locks (RLock/RUnlock)Impact
This prevents race conditions when multiple goroutines access the hash ring concurrently, which is critical for cluster membership changes happening alongside key lookups.
Test Plan
-raceflag enabled (race detector)Code Review for PR #40
Summary
This PR adds mutex protection to ConsistentHashRing for thread safety, addressing Issue #35.
Analysis
Positive aspects:
Correct lock granularity: Uses RWMutex with RLock for read operations (GetNode, GetNodes, IsEmpty) and Lock for write operations (AddNode, RemoveNode).
Complete coverage: All public methods that access shared state are protected. The private hash method correctly does not have its own lock since it is only called from within already-locked sections.
Consistent use of defer: All lock/unlock pairs use defer, ensuring locks are released even if early returns or panics occur.
No deadlock risk: The implementation does not call any external code while holding locks.
Tests pass with race detector: go test -race ./cluster/... passes.
Verdict
APPROVED - The implementation is correct, follows Go best practices for mutex usage, and addresses the issue requirements.
d33477c02ato4666bb6503Code Review for PR #40
Summary
This PR adds mutex protection to
ConsistentHashRingfor thread safety, addressing Issue #35.Analysis
What was reviewed:
cluster/hashring.go- addedsync.RWMutexand appropriate lockingPositive aspects:
Correct lock granularity: Uses
RWMutexwithRLockfor read operations (GetNode,GetNodes,IsEmpty) andLockfor write operations (AddNode,RemoveNode). This allows concurrent reads while serializing writes - the optimal pattern for this use case.Complete coverage: All public methods that access shared state are protected. The private
hashmethod correctly does not have its own lock since it's only called from within already-locked sections.Consistent use of defer: All lock/unlock pairs use
defer, ensuring locks are released even if early returns or panics occur.No deadlock risk: The implementation doesn't call any external code while holding locks, minimizing deadlock risk.
Tests pass with race detector:
go test -race ./cluster/...passes.Minor suggestions for future improvement (not blockers):
Concurrent stress tests: The existing tests don't specifically test concurrent access patterns. Consider adding a test that spawns multiple goroutines doing concurrent adds/removes/gets to validate thread safety under load.
Newline at EOF: Good - the newline at end of file was added (the old file was missing it).
Verdict
APPROVED - The implementation is correct, follows Go best practices for mutex usage, and addresses the issue requirements. All tests pass with the race detector enabled.