kerwin-zk opened a new pull request, #7862:
URL: https://github.com/apache/paimon/pull/7862
### Purpose
When no explicit Kerberos credentials (`security.kerberos.login.keytab` /
`security.kerberos.login.principal`) are provided in catalog options,
`HadoopModule.install()` calls
`UserGroupInformation.setConfiguration()` and **resets the JVM-global UGI
auth method**.
This can wipe out a Kerberos TGT already established by the host process —
e.g. by Spark via `spark.kerberos.principal` / `spark.kerberos.keytab` — and
cause downstream SASL / HMS calls
to fail with:
> `GSSException: No valid credentials provided (Mechanism level: Failed to
find any Kerberos tgt)`
Therefore, preserve the externally-established UGI when paimon has no
credentials to install.
### Tests
CI
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