consumer: parse DML path by index file in storage consumer #3861
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Summary of ChangesHello @wk989898, I'm Gemini Code Assist1! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed! This pull request significantly refactors how the storage consumer identifies and processes DML (Data Manipulation Language) files. Instead of directly parsing the DML file path to extract its index, the system now relies on a separate '.index' file. This new workflow involves reading the content of the '.index' file to retrieve the corresponding DML file name, and then using a newly introduced, regex-based parsing utility to extract the DML file's numeric index. This change aims to enhance the flexibility and reliability of DML file path resolution within the storage consumer component. Highlights
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Code Review
This pull request correctly refactors the DML file path parsing logic to use index files, which is a good architectural improvement. The implementation is mostly solid, but I've identified a couple of performance concerns related to repeated regular expression compilation in potentially hot paths. I've also noted a minor inconsistency in error handling. Addressing these points will improve the performance and maintainability of the code.
| pathRE, err := regexp.Compile(`CDC(?:_(\w+)_)?(\d+).\w+`) | ||
| if err != nil { | ||
| return 0, err | ||
| } | ||
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| return fileIdx, nil | ||
| matches := pathRE.FindStringSubmatch(fileName) |
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This regular expression is compiled on every function call, which can be inefficient if this function is on a hot path. It's better to compile it once at the package level using regexp.MustCompile and reuse the compiled object.
For example, you can define a package-level variable:
var fileNameRe = regexp.MustCompile(`CDC(?:_(\w+)_)?(\d+).\w+`)And then use fileNameRe in this function.
Additionally, the error message on line 409 (cannot match dml path pattern) could be more precise, for instance: cannot match dml file name pattern.
| pathRE, err := regexp.Compile(`CDC(?:_(\w+)_)?(\d+).\w+`) | |
| if err != nil { | |
| return 0, err | |
| } | |
| return fileIdx, nil | |
| matches := pathRE.FindStringSubmatch(fileName) | |
| matches := fileNameRe.FindStringSubmatch(fileName) |
| pathRE, err := regexp.Compile(str) | ||
| if err != nil { | ||
| return nil, err | ||
| return "", err | ||
| } |
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This regular expression is compiled on every function call. Since dateSeparator has a small, fixed set of possible values, you can pre-compile the regex for each value and store them in a package-level map to avoid repeated compilation. This will improve performance, especially if this function is called frequently.
| fileName := strings.TrimSuffix(string(data), "\n") | ||
| fileIdx, err := cloudstorage.FetchIndexFromFileName(fileName, c.fileExtension) | ||
| if err != nil { | ||
| return err |
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For consistency with the error handling in the rest of this function and to provide better debugging information with stack traces, it's recommended to wrap the returned error with errors.Trace().
| return err | |
| return errors.Trace(err) |
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/test all |
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[APPROVALNOTIFIER] This PR is APPROVED This pull-request has been approved by: 3AceShowHand, hongyunyan The full list of commands accepted by this bot can be found here. The pull request process is described here DetailsNeeds approval from an approver in each of these files:
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3 participants
What problem does this PR solve?
Issue Number: close #3784
What is changed and how it works?
Check List
Tests
Questions
Will it cause performance regression or break compatibility?
Do you need to update user documentation, design documentation or monitoring documentation?
Release note