fix: improve parallel processes cleanup

[joein]

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[coderabbitai]

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ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Advanced

Run ID: 9571ec47-16f0-4371-ab5d-9f44d32ce417

📥 Commits

Reviewing files that changed from the base of the PR and between e572d00 and b784560.

📒 Files selected for processing (1)

• fastembed/parallel_processor.py

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📝 Walkthrough

Walkthrough

During an incomplete iteration, ParallelWorkerPool.semi_ordered_map now calls the input queue’s _terminate_broken() method when available. Otherwise, it closes the queue reader.

Priority: ⬇️ Low

Estimated code review effort: 2 (Simple) | ~10 minutes

Change: Bug fix

Suggested reviewers: fu-max-boop

Merge Risk: ⚪ Minimal · up to b7845

This change improves cleanup of parallel worker processes during emergency shutdown by using a more thorough termination method when available, falling back to the previous behavior otherwise. No merge-blocking risk was identified.

Security Architecture Review

Security architecture risk: 🔵 Low · up to b7845

Early iterator shutdown is designed to stop workers that could previously hang. The change stays within the library’s worker pool, but a worker that fails to stop could be left untracked, and the new queue-shutdown path is not fully verified across supported runtimes.

Retained concerns

• Low · reliability · inferred: Early iterator close now invokes bounded worker termination, but the pool clears its process handles without confirming every worker has exited. If a worker survives termination and the final join, later pool use could lose track of it.

Security review details

Security Blast Radius

• inferred — The direct shutdown scope is one pool’s worker processes and queues. The source does not show the change granting callers new process-control authority.

Trust Boundaries and Controls

• observed — Stream items are placed on the pool’s input queue; the new queue-shutdown call instead operates on the pool’s stored input_queue during cleanup.

Resilience and Maintainability Implications

• inferred — Clearing process handles after bounded termination could weaken containment if a worker remains alive. The ordinary early-close test provides counterevidence for its tested case, not for termination failure.

Hardening Proposals

• proposed — Retain or explicitly report process handles that remain live after shutdown, and verify the method-present queue branch and failure cleanup on supported runtimes.

🚥 Pre-merge checks | ✅ 3 | ❌ 1 | ❓ 1

❌ Failed checks (1 warning, 1 inconclusive)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 1 functions across 1 files.	Write docstrings for the functions missing them to satisfy the coverage threshold.
Description check	❓ Inconclusive	No pull request description was provided, so the changes and their purpose are not documented beyond the title.	Add a brief description that explains the emergency-shutdown cleanup change in ParallelWorkerPool.semi_ordered_map, including the use of _terminate_broken() when available and the fallback to closing the queue reader.

✅ Passed checks (3 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly identifies the primary change: improving cleanup for parallel processes.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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✨ Finishing Touches 💡 1

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