share kubernetes client instances #128
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minrk
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we should hold off on this until after 0.6 of z2jh. |
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yes, I was planning to cut the release and finish z2jh before merging this |
avoids creating a kubernetes client for each Spawner, which creates a bunch of threads in kubernetes 4.0. uses weakref to avoid breaking garbage collection
minrk
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@minrk is this good to go or still WIP? |
kubespawner/clients.py
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| cache_key = (ClientType, args, kwarg_key) | ||
| client = None | ||
| if cache_key in _client_cache: | ||
| client = _client_cache[cache_key]() |
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Why the trailing ()? I think _client_cache contains instances already so this would end up calling __call__ on that instance.
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_client_cache contains weak references to instances, not the instances themselves. This allows them to be garbage collected. The ref must be called in order to return the instance. If it has been garbage collected in the meantime, resolving the weakref will return None.
I've added a comment to clarify what's happening here.
I've
minrk
changed the title
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Forgot to take off WIP that was meant to block it until shipping v0.6. This should be all set now. |
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Merging as travis is happy. Thanks for explaining the |
avoids creating a kubernetes client for each Spawner, which creates a bunch of threads in kubernetes 4.0.
uses weakref to avoid breaking garbage collection
closes #126