pan3793 opened a new pull request, #4418:
URL: https://github.com/apache/kyuubi/pull/4418
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### _Why are the changes needed?_
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Currently, we only support async retry for metadata operation, it's valuable
since it can tolerate long-time metadata store outages w/o blocking the
submission request, but it can not guarantee metadata consistency eventually.
This PR introduces a sync mode for metadata operation retry, which means
when a metadata request failed, block the request thread and retry
synchronously until success or reaches the threshold, it makes metadata
consistent, and is necessary for some cases, e.g. in async mode, when inserting
data violate the unique restriction, the user got success response but the
retry will never succeed.
### _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
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