fix(decision-worker): avoid missing decision task handling

[shijiesheng]

What changed?

• When decision worker respond decision completed, set return_new_decision_task flag to False
• fix integration test when --keep-cadence-live flag is set locally for easier testing

Why?

return_new_decision_task flag controls whether responddecisioncompletetask would return a new decision. It could happen when

1. server enable the feature
2. during decision task processing there is a buffered activity completed event. It's very common when there are concurrency activity executions
3. return_new_decision_task is set to true.

How did you test it?

Added async gather integration test to avoid regression.

Potential risks

Release notes

Documentation Changes

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

Files with missing lines	Coverage Δ
cadence/worker/_decision_task_handler.py	88.63% <100.00%> (+0.08%)	⬆️

... and 1 file with indirect coverage changes

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[timl3136]

LGTM

[gitar-bot]

Code Review ✅ Approved 1 resolved / 1 findings

Sets return_new_decision_task to false in the decision worker and improves local integration testing, addressing the hardcoded log field finding.

✅ 1 resolved

✅ Quality: Log field hardcodes return_new_decision_task=True after fix

📄 cadence/worker/_decision_task_handler.py:366 📄 cadence/worker/_decision_task_handler.py:387
The debug log at _decision_task_handler.py:387 still reports "return_new_decision_task": True, but the request now sets it to False. This makes the log misleading for anyone debugging decision-task behavior. Update the logged value to False (or reference the actual request field) so the log matches the sent request.

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