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[Cherry-pick to branch-1.3] [#13967] fix(spark-connector): Reject Kerberos for routed Iceberg REST catalogs (#13968) - #14034
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…uted Iceberg REST catalogs (#13968) ### What changes were proposed in this pull request? - With `spark.sql.gravitino.authType=token`, pass the bearer token to the routed Iceberg REST client as the `token` property. - With `kerberos`, fail at catalog initialization with an error naming the auth mode. - Explicit `rest.auth.*`, `token` or legacy OAuth2 properties keep priority and disable both. ### Why are the changes needed? Routed Iceberg catalogs reach IRC without credentials under token auth and fail with 401, and Kerberos fails silently. Fix: #13967 ### Does this PR introduce _any_ user-facing change? Yes. Token is reused for IRC, and a Kerberos session with a routed Iceberg catalog and no explicit `rest.*` auth now fails at initialization. Docs are updated. No new property keys. ### How was this patch tested? Added unit tests in `TestIcebergRestOAuthConfig`.
The token auth type (#12570) is not in branch-1.3, so only the Kerberos fail-fast is backported.
diqiu50
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Cherry-pick Information:
branch-1.3tokenauth type ([#12569] feat(spark-connector): add token auth and key caches on identity #12570) is not in branch-1.3. Only the Kerberos fail-fast is backported.