Description

This pull request refactors the logic for fetching and constructing group job states in the Job service, with a focus on improving concurrency safety and error handling. The main changes introduce mutex protection for shared state, replace the previous group job state constructor, and add a new logging helper. These updates help prevent data races and improve the clarity of error reporting.

Concurrency and data safety improvements:

• Refactored the concurrent collection of jobStates in GetGroupJobState to use a mutex (sync.Mutex) and append, replacing the previous approach that used indexed assignment. This prevents potential data races when multiple goroutines update the shared slice.
• Replaced the newGroupJobState constructor with constructGroupJobState, ensuring a single, consistent method for building GroupJobState instances. [1] [2]

Error handling and logging enhancements:

• Added error logging with the new WithGroupUUID logger helper when group job state retrieval fails, improving visibility into failures. [1] [2]
• Introduced the WithGroupUUID helper in internal/dflog/logger.go for more granular log context.

General codebase improvements:

• Added the sync package import to support the new mutex-based concurrency logic.

Related Issue

Motivation and Context

Screenshots (if appropriate)

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Documentation Update (if none of the other choices apply)

Checklist

• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.