fresh-borzoni opened a new pull request, #2989:
URL: https://github.com/apache/fluss/pull/2989
## Summary
closes #2661
Fix verified end-to-end against RustFS.
Before fix:
```
SecurityTokenException: Failed to get file access security token: Region
is not set.
-> NoAwsCredentialsException: Dynamic session credentials for Fluss: No
AWS Credentials
-> Flink job FAILED
```
After fix:
```
S3DelegationTokenProvider - Obtaining session credentials via AssumeRole
with access key: rustfsadmin, role: arn:xxx:xxx:xxx:xxxx
S3DelegationTokenProvider - Session credentials obtained successfully with
access key: I4MVXCHH4OV01YLLA9MC
S3DelegationTokenReceiver - Session credentials updated successfully
-> Flink job RUNNING
```
Config required for RustFS users:
```
s3.region: us-east-1
s3.assumed.role.arn: arn:xxx:xxx:xxx:xxxx
s3.assumed.role.sts.endpoint: http://rustfs:9000
```
Backward compatibility:
- Without s3.assumed.role.arn, falls back to GetSessionToken (existing AWS
behavior)
- Zero breaking changes for existing users
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