[v3-3-test] Defer Cadwyn import to keep FastAPI off the Task SDK worker path (#69016)#69029
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jason810496 merged 1 commit intoJun 26, 2026
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…er path (apache#69016) The Task SDK supervisor imports the execution-time schema package on every worker, and that package imported cadwyn at module load. cadwyn pulls in FastAPI, Starlette and Jinja2, which are only needed on the foreign-language-SDK schema-migration path and never for a pure-Python worker. Because the supervisor is imported lazily after the Celery prefork, each pool worker paid this import in private (non copy-on-write) pages, raising worker memory on Python 3.14. Defer the cadwyn import behind a cached bundle accessor and into _versioned_class so importing the schema package no longer loads FastAPI. The foreign-SDK path is unchanged; a regression test asserts the worker import graph stays cadwyn-free. (cherry picked from commit 85aa9b6) Co-authored-by: Jason(Zhe-You) Liu <68415893+jason810496@users.noreply.github.com>
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(cherry picked from commit 85aa9b6)