danhuawang commented on code in PR #11079:
URL: https://github.com/apache/gravitino/pull/11079#discussion_r3238809829
##########
docs/security/how-to-authenticate.md:
##########
@@ -72,6 +72,102 @@ GravitinoClient client = GravitinoClient.builder(uri)
.build();
```
+#### OAuth 2.0 token refresh for Iceberg REST clients
+
+When Gravitino is used as an Iceberg REST Catalog (IRC), some query engines
may hit OAuth 2.0 token refresh issues during long-running sessions.
+This usually happens when the identity provider doesn't support token
exchange, or when a child authentication session inherits the parent session's
expiration time.
+
+For the native Apache Iceberg OAuth 2.0 implementation, the following upstream
improvements are relevant:
+
+| Version | Change |
+| --- | --- |
+| Iceberg 1.11.0+ | Supports disabling token exchange and using client
credentials for token renewal, and fixes child `AuthSession` expiration
handling so the child session uses its own token lifetime. |
+
+Use the engine-specific settings below.
+
+##### Spark
+
+Disable token exchange in the catalog configuration:
+
+```text
+spark.sql.catalog.${catalog_name}.token-exchange-enabled=false
+```
+
+##### Flink
+
+Disable token exchange in the catalog properties:
+
+```sql
+'token-exchange-enable'='false'
+```
+
+##### Trino
+
+Set the following in the Trino catalog:
+
+```properties
+iceberg.rest-catalog.session=NONE
+iceberg.rest-catalog.oauth2.token-exchange-enabled=false
+```
+
+This setting can be omitted if you want the default behavior, because the
default value is `NONE`.
+
+##### Alternative OAuth 2.0 auth manager for Spark and Flink
+
+If the native Apache Iceberg OAuth 2.0 implementation still doesn't meet your
requirements, you can use the Dremio Iceberg OAuth 2.0 auth manager for Spark
and Flink:
+
+- Repository: `https://github.com/dremio/iceberg-auth-manager`
+- Build command: `./gradlew --no-daemon :authmgr-oauth2-runtime:shadowJar`
+- Output jar:
`${project}/oauth2/runtime/build/libs/authmgr-oauth2-runtime-<version>.jar`
+
+Place the runtime jar in:
+
+- `${SPARK_HOME}/jars` for Spark
+- `${FLINK_HOME}/lib` for Flink
+
+For Spark, also add the jar to both the driver and executor classpaths:
+
+```text
+spark.driver.extraClassPath=${SPARK_HOME}/jars/authmgr-oauth2-runtime-<version>.jar
+spark.executor.extraClassPath=${SPARK_HOME}/jars/authmgr-oauth2-runtime-<version>.jar
+```
+
+Example Spark configuration using client credentials token refresh:
+
+```text
+spark.sql.catalog.irc=org.apache.iceberg.spark.SparkCatalog
+spark.sql.catalog.irc.type=rest
+spark.sql.catalog.irc.uri=http://localhost:9001/iceberg/
+spark.sql.catalog.irc.warehouse=<catalog_name>
Review Comment:
Is `spark.sql.catalog.gravitino_irc_b_mysql_backend.prefix <catalog_name>`
required?
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