Merge pull request #20462 from WilliamDAssafMSFT/20211014-sqlhdfs-location

20211014 add sqlhdfs and sqldatapool

Author: PRMerger20

docs/t-sql/statements/create-external-data-source-transact-sql.md

@@ -2,7 +2,7 @@
 description: "CREATE EXTERNAL DATA SOURCE (Transact-SQL)"
 title: "CREATE EXTERNAL DATA SOURCE (Transact-SQL)"
 ms.custom: ""
-ms.date: 07/16/2021
+ms.date: 10/18/2021
 ms.prod: sql
 ms.prod_service: "database-engine, sql-database, synapse-analytics, pdw"
 ms.reviewer: ""
@@ -638,11 +638,13 @@ Provides the connectivity protocol and path to the external data source.
 | Generic ODBC                    | `odbc`          | `<server_name>[:port]`                                | Starting with [!INCLUDE[sql-server-2019](../../includes/sssql19-md.md)] - Windows only        |
 | Bulk Operations         | `https`         | `<storage_account>.blob.core.windows.net/<container>` | Starting with [!INCLUDE[ssSQL17](../../includes/sssql17-md.md)]                        |
 | Azure Data Lake Storage Gen2 |   `abfs[s]` | `abfss://<container>@<storage _account>.dfs.core.windows.net`  |  Starting with [!INCLUDE[sql-server-2019](../../includes/sssql19-md.md)] CU11+. |
+| [!INCLUDE[ssbigdataclusters-ss-nover](../../includes/ssbigdataclusters-ss-nover.md)]  data pool | `sqldatapool` | `sqldatapool://controller-svc/default` | Starting with [!INCLUDE[ssbigdataclusters-ss-nover](../../includes/ssbigdataclusters-ss-nover.md)] | 
+| [!INCLUDE[ssbigdataclusters-ss-nover](../../includes/ssbigdataclusters-ss-nover.md)]  storage pool | `sqlhdfs` | `sqlhdfs://controller-svc/default` | Starting with [!INCLUDE[ssbigdataclusters-ss-nover](../../includes/ssbigdataclusters-ss-nover.md)]  |
 |||||
 
 #### Location path:
 
-- `<`Namenode`>` = the machine name, name service URI, or IP address of the `Namenode` in the Hadoop cluster. PolyBase must resolve any DNS names used by the Hadoop cluster. <!-- For highly available Hadoop configurations, provide the Nameservice ID as the `LOCATION`. -->
+- `<Namenode>` = the machine name, name service URI, or IP address of the `Namenode` in the Hadoop cluster. PolyBase must resolve any DNS names used by the Hadoop cluster. <!-- For highly available Hadoop configurations, provide the Nameservice ID as the `LOCATION`. -->
 - `port` = The port that the external data source is listening on. In Hadoop, the port can be found using the `fs.defaultFS` configuration parameter. The default is 8020.
 - `<container>` = the container of the storage account holding the data. Root containers are read-only, data can't be written back to the container.
 - `<storage_account>` = the storage account name of the Azure resource.
@@ -659,6 +661,7 @@ Additional notes and guidance when setting the location:
 - The `abfs` or `abfss` APIs are supported when accessing Azure Storage Accounts starting with [!INCLUDE[sql-server-2019](../../includes/sssql19-md.md)] CU11. For more information, see [the Azure Blob Filesystem driver (ABFS)](/azure/storage/blobs/data-lake-storage-abfs-driver).
 - The Hierarchical Namespace option for Azure Storage Accounts(V2) using `abfs[s]` is supported via Azure Data Lake Storage Gen2 starting with [!INCLUDE[sql-server-2019](../../includes/sssql19-md.md)] CU11+. The Hierarchical Namespace option is otherwise not supported, and this option should remain **disabled**.
 - To ensure successful PolyBase queries during a Hadoop `Namenode` fail-over, consider using a virtual IP address for the `Namenode` of the Hadoop cluster. If you don't, execute an [ALTER EXTERNAL DATA SOURCE][alter_eds] command to point to the new location.
+- The `sqlhdfs` and `sqldatapool` types are supported for connecting between the master instance and storage pool of a big data cluster. For Cloudera CDH or Hortonworks HDP, use `hdfs`. For more information on using `sqlhdfs` for querying [!INCLUDE[ssbigdataclusters-ss-nover](../../includes/ssbigdataclusters-ss-nover.md)] storage pools, see [Query HDFS in a SQL Server big data cluster](../../big-data-cluster/tutorial-query-hdfs-storage-pool.md).
 
 #### CONNECTION_OPTIONS = *key_value_pair*