fix: fix slice init length

[cuishuang]

User description

What type of PR is this?

• BUG

Which issue(s) this PR fixes:

What this PR does / why we need it:

The intention here should be to initialize a slice with a capacity of length rather than initializing the length of this slice.

The online demo: https://go.dev/play/p/q1BcVCmvidW

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PR Type

Bug fix

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Description

• Fixed slice initialization by using capacity instead of length in the snapshot.go file.
• Updated the exportPath, snapshotPath, and Init methods to correctly initialize slices with a capacity.

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Changes walkthrough 📝

	Relevant files
Bug fix	snapshot.go Correct slice initialization to use capacity                          pkg/logservice/snapshot.go Changed slice initialization to use capacity instead of length. Updated slice creation in exportPath, snapshotPath, and Init methods. +3/-3

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[qodo-merge-pro]

PR Reviewer Guide 🔍

Here are some key observations to aid the review process:

⏱️ Estimated effort to review: 2 🔵🔵⚪⚪⚪

🧪 No relevant tests

🔒 No security concerns identified

⚡ Recommended focus areas for review Potential Performance Improvement The slice initialization changes may improve memory allocation efficiency, but the impact on performance should be verified through benchmarks. Code Consistency The exportPath method still uses a fixed-size slice initialization, which is inconsistent with the changes made in other methods.

[qodo-merge-pro]

PR Code Suggestions ✨

Explore these optional code suggestions:

Category	Suggestion	Score
Performance	Pre-allocate the slice with the exact size to potentially improve performance In the snapshotPath function, consider pre-allocating the parts slice with a capacity of 2 instead of 0. This can potentially improve performance by reducing the number of allocations, especially if this function is called frequently. pkg/logservice/snapshot.go [246-251] func (sm *snapshotManager) snapshotPath(nodeID nodeID, index snapshotIndex) string { - parts := make([]string, 0, 2) - snapshotPart := fmt.Sprintf(snapshotPathPattern, index) - parts = append(parts, sm.exportPath(nodeID.shardID, nodeID.replicaID), snapshotPart) + parts := make([]string, 2) + parts[0] = sm.exportPath(nodeID.shardID, nodeID.replicaID) + parts[1] = fmt.Sprintf(snapshotPathPattern, index) return filepath.Join(parts...) } Apply this suggestion Suggestion importance[1-10]: 8 Why: Pre-allocating the slice with the exact size can improve performance by reducing memory allocations. This suggestion is relevant and correctly addresses the existing code, offering a tangible performance benefit.	8
Enhancement	Use a constant for slice capacity to improve code readability and maintainability Consider using a constant for the capacity of the parts slice. This can improve code readability and maintainability. You can define a constant at the package level, such as const partsCapacity = 3, and use it in both exportPath and snapshotPath functions. pkg/logservice/snapshot.go [237-242] +const partsCapacity = 3 + func (sm *snapshotManager) exportPath(shardID uint64, replicaID uint64) string { - parts := make([]string, 0, 3) + parts := make([]string, 0, partsCapacity) dir := sm.cfg.SnapshotExportDir shardPart := fmt.Sprintf("shard-%d", shardID) replicaPart := fmt.Sprintf("replica-%d", replicaID) parts = append(parts, dir, shardPart, replicaPart) Apply this suggestion Suggestion importance[1-10]: 7 Why: Using a constant for the slice capacity enhances code readability and maintainability by providing a clear, single point of change if the capacity needs to be adjusted. This suggestion is relevant and accurately reflects the existing code.	7
Best practice	Use a more descriptive variable name to improve code readability In the Init function, consider using a more descriptive variable name for the slice of indexes. For example, snapshotIndexes would be more informative than indexes. pkg/logservice/snapshot.go [286-290] -indexes := make([]int, 0, len(names)) +snapshotIndexes := make([]int, 0, len(names)) for _, name := range names { index, err := sm.parse(name) if err != nil { continue Apply this suggestion Suggestion importance[1-10]: 6 Why: Using a more descriptive variable name like snapshotIndexes improves code readability and understanding. This suggestion is valid and enhances the clarity of the code without affecting functionality.	6

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[cuishuang]

friendly ping~