meel-ayush opened a new pull request, #76912:
URL: https://github.com/apache/airflow/pull/76912
### Description
When `get_schema_k8s()` in
`chart/tests/chart_utils/helm_template_generator.py` downloads Kubernetes JSON
validation schemas over the network from `airflow.apache.org`, transient TLS
handshake timeouts or TCP socket resets cause an unhandled `URLError` and fail
otherwise passing test runs.
During parallel test execution with `pytest -n 4`, momentary network stalls
exceeding the 30-second socket timeout fail the entire 10-minute Helm test run.
The fix wraps `urlopen` in an exponential backoff retry loop (up to 3
attempts with 1.0s and 2.0s delays) that catches transient socket and network
errors (`URLError`, `TimeoutError`, `OSError`, and non-404 `HTTPError`s).
Deterministic schema missing conditions (`HTTPError` 404) continue to
immediately raise `FileNotFoundError` without retrying.
### Tests
- Added `chart/tests/helm_tests/airflow_aux/test_helm_template_generator.py`
covering:
- First-attempt retrieval success.
- Retrying transient network errors (`URLError`, `TimeoutError`,
`OSError`, and `HTTPError` 503).
- Terminal failure after exhausting 3 attempts.
- Immediate `FileNotFoundError` fast-failure on HTTP 404 without retrying.
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