# 🔍 Description
This pull request fixes #6212
When Kyuubi cleans up Ranger related threads like PolicyRefresher, it should also shutdown the audit threads that include SolrZkClient. Otherwise Spark Driver keeps on running since SolrZkClient is a non-daemon thread. Added the cleanup as part of the shutdown hook that Kyuubi registers.
## Types of changes 🔖
- [x] Bugfix (non-breaking change which fixes an issue)
- [ ] New feature (non-breaking change which adds functionality)
- [ ] Breaking change (fix or feature that would cause existing functionality to change)
## Test Plan 🧪
#### Behavior Without This Pull Request ⚰️
#### Behavior With This Pull Request 🎉
#### Related Unit Tests
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# Checklist 📝
- [ ] This patch was not authored or co-authored using [Generative Tooling](https://www.apache.org/legal/generative-tooling.html)
**Be nice. Be informative.**
Closes #6233 from amanraj2520/auditShutdown.
Closes #6212
e663d466c [amanraj2520] Refactored code
ed293a9a4 [amanraj2520] Removed unused import
95a6814ad [amanraj2520] Added audit handler shutdown to the shutdown hook
Authored-by: amanraj2520 <rajaman@microsoft.com>
Signed-off-by: Cheng Pan <chengpan@apache.org>
(cherry picked from commit
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For developers
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