fix force flush timeout

[jiangxinmeng1]

What type of PR is this?

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

Which issue(s) this PR fixes:

issue #16360

What this PR does / why we need it:

check err before add observer

[matrix-meow]

@jiangxinmeng1 Thanks for your contributions!

Pull Request Review:

Title:

The title of the pull request is clear and concise, indicating that it addresses a fix related to force flush timeout.

Body:

The body of the pull request provides relevant information about the type of PR (bug fix), the specific issue it addresses (issue #16360), and the reason for the changes made in the PR (checking error before adding an observer).

Changes:

1. In the MergeExecutor function in executor.go, a check for error err is added before adding an observer to the task. If an error occurs during the creation of the MergeObjectsTask, the function will now return early with the error instead of proceeding to add an observer.

Feedback and Suggestions:

1. Error Handling Improvement:

   • The addition of the error check before adding an observer is a good practice to ensure that errors are properly handled. This prevents adding an observer to a task that was not successfully created due to an error.
   • Suggestion: Consider providing a more descriptive error message or logging the error to aid in troubleshooting and debugging in the future.

2. Code Optimization:

   • The current change is straightforward and addresses the immediate issue. However, there might be an opportunity to optimize the error handling and observer addition logic for better code readability and maintainability.
   • Suggestion: Depending on the context and requirements, you could consider refactoring the error handling and observer addition logic to separate concerns and improve code structure.

3. Security Concerns:

   • While the changes made in this pull request focus on error handling, it's essential to ensure that error messages or sensitive information are not exposed unintentionally.
   • Suggestion: Review the error handling mechanism to avoid leaking sensitive data or internal details in error messages that could potentially be exploited by attackers.

4. Testing:

   • It's crucial to verify that the error handling and observer addition changes function as expected and do not introduce regressions.
   • Suggestion: Include relevant test cases to cover scenarios where errors occur during task creation and ensure that observers are not added in such cases.

5. Documentation:

   • Consider updating any relevant documentation or comments to reflect the changes made in this pull request for better code understanding by other developers.
   • Suggestion: Add comments to explain the rationale behind the error check and observer addition to improve code maintainability and readability.

In conclusion, the pull request addresses a specific bug related to error handling in the codebase. By incorporating the suggestions provided, you can enhance the error handling mechanism, optimize the code structure, and ensure the security and reliability of the application.