zwangsheng opened a new pull request, #4625:
URL: https://github.com/apache/kyuubi/pull/4625
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### _Why are the changes needed?_
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Close #4623
To reduce the pressure on the Api Server (which use the kubernetes client
polls with label to find the `spark driver pod` when multiple Rest Application
are running at the same time), use informer, the kubernetes-recommended method
of maintaining the application state.
### _How was this patch tested?_
- [ ] Add some test cases that check the changes thoroughly including
negative and positive cases if possible
- [ ] Add screenshots for manual tests if appropriate
- [ ] [Run
test](https://kyuubi.readthedocs.io/en/master/develop_tools/testing.html#running-tests)
locally before make a pull request
- [x] Run CI
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