PhillHenry commented on issue #3451:
URL: https://github.com/apache/polaris/issues/3451#issuecomment-3847454032
Running the SQL `s"CREATE NAMESPACE IF NOT EXISTS
$FEDERATED_CATALOG_NAME.$namespace"` results in this error in my client Spark
code that uses the GCP Federated catalog that was successfully created:
```
Malformed request: Malformed request: unsupported_grant_type: Invalid
grant_type: client_credentials
org.apache.iceberg.exceptions.BadRequestException: Malformed request:
Malformed request: unsupported_grant_type: Invalid grant_type:
client_credentials
at
org.apache.iceberg.rest.ErrorHandlers$NamespaceErrorHandler.accept(ErrorHandlers.java:183)
at
org.apache.iceberg.rest.ErrorHandlers$NamespaceErrorHandler.accept(ErrorHandlers.java:173)
at org.apache.iceberg.rest.HTTPClient.throwFailure(HTTPClient.java:240)
at org.apache.iceberg.rest.HTTPClient.execute(HTTPClient.java:336)
at org.apache.iceberg.rest.HTTPClient.execute(HTTPClient.java:297)
at org.apache.iceberg.rest.BaseHTTPClient.get(BaseHTTPClient.java:77)
at org.apache.iceberg.rest.RESTClient.get(RESTClient.java:88)
at
org.apache.iceberg.rest.RESTSessionCatalog.loadNamespaceMetadata(RESTSessionCatalog.java:623)
at
org.apache.iceberg.catalog.BaseSessionCatalog$AsCatalog.loadNamespaceMetadata(BaseSessionCatalog.java:138)
at
org.apache.iceberg.rest.RESTCatalog.loadNamespaceMetadata(RESTCatalog.java:242)
at
org.apache.iceberg.spark.SparkCatalog.loadNamespaceMetadata(SparkCatalog.java:463)
at
org.apache.spark.sql.connector.catalog.SupportsNamespaces.namespaceExists(SupportsNamespaces.java:98)```
```
using `org.apache.iceberg:iceberg-spark-runtime-3.5_2.12:jar:1.10.0` on the
client JVM.
On the Polaris side (commit `f0ede57951810e1bac2812e4e6498d261e09d4d5`) the
logs look like:
```
2026-02-04 13:19:13,883 INFO [org.apa.ice.res.aut.AuthManagers]
[1f92f653-6f01-4197-84bc-ce9b4d9b5c62_0000000000000000010,POLARIS] [,,,]
(executor-thread-1) Loading AuthManager implementation:
org.apache.iceberg.rest.auth.OAuth2Manager
2026-02-04 13:19:14,207 DEBUG
[org.apa.pol.ser.cat.ice.IcebergCatalogAdapter]
[1f92f653-6f01-4197-84bc-ce9b4d9b5c62_0000000000000000010,POLARIS] [,,,]
(executor-thread-1) RuntimeException while operating on catalog. Propagating to
caller.: org.apache.iceberg.exceptions.BadRequestException: Malformed request:
unsupported_grant_type: Invalid grant_type: client_credentials
at
org.apache.iceberg.rest.ErrorHandlers$OAuthErrorHandler.accept(ErrorHandlers.java:280)
at
org.apache.iceberg.rest.ErrorHandlers$OAuthErrorHandler.accept(ErrorHandlers.java:254)
at
org.apache.iceberg.rest.HTTPClient.throwFailure(HTTPClient.java:240)
at org.apache.iceberg.rest.HTTPClient.execute(HTTPClient.java:336)
at org.apache.iceberg.rest.HTTPClient.execute(HTTPClient.java:297)
at
org.apache.iceberg.rest.BaseHTTPClient.postForm(BaseHTTPClient.java:136)
at
org.apache.iceberg.rest.auth.OAuth2Util.fetchToken(OAuth2Util.java:291)
at
org.apache.iceberg.rest.auth.OAuth2Manager.initSession(OAuth2Manager.java:87)
at
org.apache.iceberg.rest.auth.OAuth2Manager.initSession(OAuth2Manager.java:40)
at
org.apache.iceberg.rest.RESTSessionCatalog.initialize(RESTSessionCatalog.java:204)
at
org.apache.iceberg.rest.RESTCatalog.initialize(RESTCatalog.java:82)
at
org.apache.polaris.service.catalog.iceberg.IcebergRESTExternalCatalogFactory.createCatalog(IcebergRESTExternalCatalogFactory.java:57)
at
org.apache.polaris.service.catalog.iceberg.IcebergRESTExternalCatalogFactory_ClientProxy.createCatalog(Unknown
Source)
at
org.apache.polaris.service.catalog.iceberg.IcebergCatalogHandler.initializeCatalog(IcebergCatalogHandler.java:303)
at
org.apache.polaris.service.catalog.common.CatalogHandler.authorizeBasicNamespaceOperationOrThrow(CatalogHandler.java:162)
at
org.apache.polaris.service.catalog.common.CatalogHandler.authorizeBasicNamespaceOperationOrThrow(CatalogHandler.java:106)
at
org.apache.polaris.service.catalog.iceberg.IcebergCatalogHandler.loadNamespaceMetadata(IcebergCatalogHandler.java:368)
at
org.apache.polaris.service.catalog.iceberg.IcebergCatalogAdapter.lambda$loadNamespaceMetadata$2(IcebergCatalogAdapter.java:230)
at
org.apache.polaris.service.catalog.iceberg.IcebergCatalogAdapter.withCatalogByName(IcebergCatalogAdapter.java:161)
at
org.apache.polaris.service.catalog.iceberg.IcebergCatalogAdapter.withCatalog(IcebergCatalogAdapter.java:153)
at
org.apache.polaris.service.catalog.iceberg.IcebergCatalogAdapter.loadNamespaceMetadata(IcebergCatalogAdapter.java:229)
```
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