fileservice: add i/o timeout as retryable error

[reusee]

What type of PR is this?

• API-change
• BUG
• Improvement
• Documentation
• Feature
• Test and CI
• Code Refactoring

Which issue(s) this PR fixes:

issue #15307

What this PR does / why we need it:

retry on i/o timeout

[matrix-meow]

@reusee Thanks for your contributions!

Pull Request Review:

Title:

The title of the pull request is clear and concise, indicating the specific change being made to the fileservice related to adding I/O timeout as a retryable error.

Body:

The body of the pull request provides relevant information about the type of PR, the specific issue it fixes, and the reason for the change. It also mentions that the PR is related to retrying on I/O timeout, which aligns with the title and the code changes.

Changes:

1. The code change in the IsRetryableError function in error.go file adds the condition strings.Contains(str, "i/o timeout") to check for I/O timeout errors as retryable errors.

Feedback and Suggestions for Improvement:

1. Security Concern:

   • It's important to handle I/O timeout errors carefully, especially in scenarios where retrying may not be the best approach. Consider the implications of retrying on I/O timeout errors, as it may lead to potential performance issues or unintended consequences. Ensure that retrying is the appropriate action for these specific errors.

2. Code Optimization:

   • Instead of directly checking for the string "i/o timeout", consider using a more robust and specific error type or variable to identify I/O timeout errors. This can help in better error handling and clarity in code maintenance.

3. Error Handling Strategy:

   • Evaluate the overall error handling strategy in the fileservice module to ensure that retrying on specific errors, including I/O timeout, aligns with the application's requirements and performance considerations.

4. Documentation:

   • Consider updating the documentation or adding comments to explain the rationale behind retrying on I/O timeout errors and any considerations that developers should be aware of when dealing with such errors.

5. Testing:

   • Verify that the retry mechanism for I/O timeout errors works as expected by adding appropriate test cases to cover this scenario. Ensure that the retry logic is robust and handles edge cases effectively.

6. Consistency:

   • Ensure consistency in error handling across the fileservice module to maintain a coherent approach to handling different types of errors.

7. Code Review:

   • Request a thorough code review from team members to validate the changes and gather feedback on the error handling strategy, especially regarding retrying on I/O timeout errors.

By addressing the security concerns, optimizing the code, refining the error handling strategy, updating documentation, testing thoroughly, maintaining consistency, and seeking code review, the pull request can be enhanced to ensure the reliability and efficiency of the fileservice module.

Overall, the pull request is on the right track by addressing retryable errors related to I/O timeout, but it requires careful consideration and validation to ensure it aligns with best practices and the application's requirements.