# 🔍 Description
## Issue References 🔗https://github.com/apache/kyuubi/pull/5185 changed the type of `kyuubi.authentication` from `Seq`(ordered) to `Set`(unordered), which break the assumption of
```
Note that: for SASL authentication, KERBEROS and PLAIN auth types are supported
at the same time, and only the first specified PLAIN auth type is valid.
```
## Describe Your Solution 🔧
Restore the type to Seq
## 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 🧪
UT is updated
---
# Checklist 📝
- [x] This patch was not authored or co-authored using [Generative Tooling](https://www.apache.org/legal/generative-tooling.html)
**Be nice. Be informative.**
Closes#5990 from pan3793/auth-plain.
Closes#5990
acae25f68 [Cheng Pan] fix doc
cef7dba90 [Cheng Pan] fix
87b370ffe [Cheng Pan] Always take the first declared SASL/PLAIN auth type
Authored-by: Cheng Pan <chengpan@apache.org>
Signed-off-by: Cheng Pan <chengpan@apache.org>
3b2e674364