Add docs for Alluxio file system

Co-authored-by: Manfred Moser <manfred@simpligility.ca>

docs/src/main/sphinx/object-storage.md

@@ -60,6 +60,7 @@ compatible replacements:
 * [](/object-storage/file-system-azure)
 * [](/object-storage/file-system-gcs)
 * [](/object-storage/file-system-s3)
+* [](/object-storage/file-system-alluxio)
 
 The native support is available in all four connectors, but must be activated
 for use.
@@ -90,6 +91,7 @@ Trino also provides the following additional support and features for object
 storage:
 
 * [](/object-storage/file-system-cache)
+* [](/object-storage/file-system-alluxio)
 * [](/object-storage/metastores)
 * [](/object-storage/file-formats)
 
@@ -106,6 +108,7 @@ storage:
 /object-storage/legacy-gcs
 /object-storage/legacy-s3
 /object-storage/file-system-cache
+/object-storage/file-system-alluxio
 /object-storage/metastores
 /object-storage/file-formats
 ```

docs/src/main/sphinx/object-storage/file-system-alluxio.md

@@ -0,0 +1,44 @@
+# Alluxio file system support
+
+Trino includes a native implementation to access
+[Alluxio](https://docs.alluxio.io/os/user/stable/en/Overview.html) as a file
+system with a catalog using the Delta Lake, Hive, Hudi, or Iceberg connectors.
+An Alluxio cluster acts as caching layer for one or more Trino catalogs and even
+clusters or other systems, in front of the actual object storage.
+
+For comparison the [](/object-storage/file-system-cache) caches data locally on
+the Trino cluster nodes and is separate for each catalog and cluster.
+
+Enable the Alluxio file system with `fs.alluxio.enabled=true` in your catalog
+properties file.
+
+## Configuration
+
+Use the following properties to configure general aspects of Alluxio file system
+support in your catalog properties file:
+
+:::{list-table}
+:widths: 40, 60
+:header-rows: 1
+
+* - Property
+  - Description
+* - `fs.alluxio.enabled`
+  - Activate the Alluxio file system support. Defaults to `false`.
+:::
+
+## Alluxio client configuration
+
+The Alluxio cluster connection is configured in the `alluxio-site.properties`
+properties file. The same config file must be located in `/opt/alluxio/conf` on
+all Trino cluster nodes. Follow the [Alluxio client configuration
+documentation](https://docs.alluxio.io/os/user/stable/en/operation/Configuration.html)
+for more details.
+
+Example content of `alluxio-site.properties`:
+
+```properties
+alluxio.master.hostname=127.0.0.1
+alluxio.master.port=19998
+alluxio.security.authentication.type=NOSASL
+```