Modifying fetching method of slurm state job

[vikramvs-gg]

What is the change
This change modifies the way the slurm job status is fetched in the slurm_simple_job_completion.py script. This script is used in multiple integration tests to trigger jobs on slurm cluster and validate jobs completed successfully.

Why is it needed
There were transient test failures because the job status could not be fetched. This is because the command used within the job_state function to fetch the job status returned an empty list of jobs (json.loads(stdout)["jobs"] is empty). The script expected to find details for a specific job_id, but none were found. This transient issue that can happen if the job completes and is purged from the slurm controller's active memory before the test has a chance to check its final state.

Fix done
Fixing this issue by using sacct instead of scontrol.
scontrol queries the state of jobs that are currently active or recently completed in the Slurm controller's memory. If a job finishes and is quickly purged, scontrol will find no record of it, leading to the IndexError (race condition).
sacct queries the slurm accounting database, which stores a historical record of all jobs. It is specifically designed to get the final status, exit code, and resource usage of jobs that have already finished.

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[gemini-code-assist]

Summary of Changes

Hello @vikramvs-gg, 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 enhances the stability and reliability of Slurm integration tests by refactoring the job state fetching mechanism. By switching from scontrol to sacct, the system now leverages a more persistent and comprehensive source for job status information, effectively mitigating race conditions that previously led to transient test failures. This change ensures that job completion checks are robust, providing more accurate and consistent test results.

Highlights

• Improved Slurm Job State Fetching: The method for fetching Slurm job states has been updated from scontrol to sacct in the slurm_simple_job_completion.py script. This change addresses transient test failures where scontrol would fail to find recently completed jobs.
• Enhanced Reliability: sacct queries the Slurm accounting database, providing a historical record of all jobs, which is more reliable for checking the final status of jobs compared to scontrol that primarily queries active or recently completed jobs in memory.
• Robust Error Handling and Logging: The job_state function now includes comprehensive error handling for JSON parsing and cases where job information is not found, returning specific states like 'NOT_FOUND' or 'PARSE_ERROR'. Debug, info, and warning logs have also been added for better visibility during test execution.
• Improved Test Assertion Message: The assertion message in runTest has been enhanced to include the final job state, making it easier to diagnose why a job did not complete successfully during integration tests.

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[gemini-code-assist]

Code Review

This pull request addresses a race condition in Slurm job status fetching by switching from scontrol to sacct. This is a solid improvement for test reliability. The updated assertion messages are also more informative. I've added one suggestion to make the parsing of sacct output more robust by explicitly searching for the main job ID instead of assuming it's the first entry in the list, which will further prevent potential flakiness.

[sarthakag]

Nit: s/print/log.info ?