Hint Suggestions for invalid pipeline options

[tarun-google]

Fixes #28402

The base fix #29474 added the warning log for invalid pipeline arguments. But as shown in the fix PR image itself the warning shows multiple times. The reason being get_all_options is called multiple times. In an yaml pipeline i ran its called 4 times, one while parsing yaml and then couple of times while calling expansion service(source&sink) and then during the pipeline submission.

1. made an explicit call during run_pipeline which i expect to be the stage of pipeline execution that every path share. And added warning logs only during that call.
2. Added suggestions(if available) using python difflib library

The cost of argument parsing and suggestions is minimal and one time, at the beginning of pipeline execution.

Before Fix:

After Fix:

GitHub Actions Tests Status (on master branch)

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[gemini-code-assist]

Summary of Changes

Hello @tarun-google, 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 refines how Apache Beam handles invalid pipeline options. It streamlines the warning mechanism to prevent repetitive log messages and introduces helpful suggestions for mistyped arguments, making the system more user-friendly and efficient.

Highlights

• Reduced Warning Redundancy: The pull request resolves the issue of duplicate warning logs for invalid pipeline arguments by ensuring warnings are displayed only once during the final run_pipeline stage.
• Improved User Feedback: Invalid pipeline options now include suggestions for correct options, leveraging Python's difflib library to enhance user experience.
• Performance Optimization: The argument parsing and suggestion generation process is optimized to be a minimal, one-time cost at the beginning of pipeline execution.

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[derrickaw]

/gemini review

[gemini-code-assist]

Code Review

This pull request improves the warning mechanism for invalid pipeline options by consolidating the warning log to a single call and providing helpful suggestions for misspelled long options using difflib. The changes are well-structured and achieve the goal described. I have one suggestion to ensure that warnings are still issued for all types of unknown arguments, not just long options, to avoid a regression from previous behavior.

[tarun-google]

Run Python_ML PreCommit 3.12

[github-actions]

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R: @jrmccluskey for label python.

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[damccorm]

Thanks!