hjtran opened a new pull request, #32517:
URL: https://github.com/apache/beam/pull/32517
`WorkerHandlerManager` stores cached handlers as `self._cached_handlers =
defaultdict(str)`. When you reset the manager with `manager.close_all()` it
resets the cached to just a regular dict instead of a default dict, i.e.
`self._cached_handlers = {}`.
If you try to create another worker handler after calling `close_all()`,
you'll get a KeyError.
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