brightwon opened a new pull request, #3864:
URL: https://github.com/apache/iceberg-python/pull/3864

   Closes #3787
   
   # Rationale for this change
   
   The Hive catalog derives the Kerberos SASL `host` (the hostname component of 
the service principal) from the metastore URI, with no way to override it. 
Authentication therefore fails whenever the service principal's hostname 
component differs from the host being connected to, for example in an HA setup 
where `uri` has to list the real metastore hosts while the principal uses a 
single fixed hostname.
   
   This adds an optional `hive.kerberos-service-host` property, mirroring the 
existing `hive.kerberos-service-name` for the `service` component. When it is 
not set, the URI host is used, so existing behavior is unchanged.
   
   ## Are these changes tested?
   
   Yes.
   
   - `test_create_hive_client_with_kerberos_service_host` verifies the property 
is passed through to `_HiveClient`.
   - `test_kerberized_client_uses_configured_service_host` verifies at the 
transport level that the SASL host is the configured value, and falls back to 
the URI host when the property is not set.
   - The existing `_create_hive_client` assertions were updated for the new 
argument.
   
   I also verified it end-to-end against a Hive Metastore with Kerberos: 
without the property the connection fails with a KDC `LOOKING_UP_SERVER` error, 
and with it the correct service ticket is issued and the catalog works.
   
   ## Are there any user-facing changes?
   
   Yes, a new optional Hive catalog property `hive.kerberos-service-host`. It 
defaults to the metastore URI host, so there is no change for existing users. 
The documentation table has been updated.
   


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