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PolyBase Connectivity Configuration (Transact-SQL)

  • Article

Applies to: SQL Server Not supported Azure SQL Database Not supported Azure Synapse Analytics Analytics Platform System (PDW)

Displays or changes global configuration settings for PolyBase Hadoop and Microsoft Azure Blob Storage connectivity.

Transact-SQL syntax conventions

Syntax

  
--List all of the configuration options  
sp_configure  
[;]  
  
--Configure Hadoop connectivity  
sp_configure [ @configname = ] 'hadoop connectivity',  
             [ @configvalue = ] { 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 }  
[;]  
  
RECONFIGURE  
[;]

Arguments

[ @configname= ] 'option_name'
Is the name of a configuration option. option_name is varchar(35), with a default of NULL. If not specified, the complete list of options is returned.

[ @configvalue= ] 'value'
Is the new configuration setting. value is int, with a default of NULL. The maximum value depends on the individual option.

'hadoop connectivity'
Specifies the type of Hadoop data source for all connections from PolyBase to Hadoop clusters or Azure Blob Storage. For more information, see CREATE EXTERNAL DATA SOURCE (Transact-SQL).

These are the Hadoop connectivity settings and their corresponding supported Hadoop data sources. Only one setting can be in effect at a time.

Options 1, 4, 7, and 8 allow multiple types of external data sources to be created and used across all sessions on the server.

  • Option 0: Disable Hadoop connectivity

  • Option 1: Hortonworks HDP 1.3 on Windows Server

  • Option 1: Azure Blob Storage (WASB[S])

  • Option 2: Hortonworks HDP 1.3 on Linux

  • Option 3: Cloudera CDH 4.3 on Linux

  • Option 4: Hortonworks HDP 2.0 on Windows Server

  • Option 4: Azure Blob Storage (WASB[S])

  • Option 5: Hortonworks HDP 2.0 on Linux

  • Option 6: Cloudera CDH 5.1, 5.2, 5.3, 5.4, 5.5, 5.9, 5.10, 5.11, 5.12, and 5.13 on Linux

  • Option 7: Hortonworks HDP 2.1, 2.2, 2.3, 2.4, 2.5, 2.6, 3.0 on Linux

  • Option 7: Hortonworks HDP 2.1, 2.2, 2.3, 2.4 on Windows Server

  • Option 7: Azure Blob Storage (WASB[S])

  • Option 8:* Hortonworks HDP 3.1, Cloudera CDH 6.1, 6.2, 6.3, Azure Blob Storage (WASB[S]) and Azure Data Lake Storage Gen2 (ABFS[S])

* Option 8 introduced with SQL Server 2019 CU11.

​By default, the Hadoop connectivity is set to 0 (disabled). You should configure the PolyBase hadoop connectivity value after installing then enabling PolyBase. For more information, see Install PolyBase on Windows and Configure PolyBase to access external data in Hadoop.

RECONFIGURE
Updates the run value (run_value) to match the configuration value (config_value). See Result Sets for definitions of run_value and config_value. The new configuration value that is set by sp_configure does not become effective until the run value is set by the RECONFIGURE statement. Then, after running RECONFIGURE, you must stop and restart the SQL Server service.

Important

Note that when stopping the SQL Server service, the two additional services will also automatically stop: PolyBase Engine and Data Movement Service. After restarting the SQL Server engine service, manually start these two services again, as they won't start automatically.

Return code values

0 (success) or 1 (failure)

Result Sets

When executed with no parameters, sp_configure returns a result set with five columns.

Column name Data type Description
name nvarchar(35) Name of the configuration option.
minimum int Minimum value of the configuration option.
maximum int Maximum value of the configuration option.
config_value int Value that was set using sp_configure.
run_value int Current value in use by PolyBase. This value is set by running RECONFIGURE.

The config_value and run_value are usually the same unless the value is in the process of being changed.

A restart might be required before this run value is accurate, if the reconfiguration is in progress.

General remarks

In SQL Server, after running RECONFIGURE, for the run value of the 'hadoop connectivity' to take effect, you need to restart SQL Server.

In Analytics Platform System (PDW), after running RECONFIGURE, for the run value of the 'hadoop connectivity' to take effect, you need to restart the Analytics Platform System (PDW) region.

Starting in SQL Server 2022 (16.x), Hadoop is no longer supported in PolyBase.

Limitations and restrictions

RECONFIGURE is not allowed in an explicit or implicit transaction.

Permissions

All users can execute sp_configure with no parameters or the @configname parameter.

Requires ALTER SETTINGS server-level permission or membership in the sysadmin fixed server role to change a configuration value or to run RECONFIGURE.

Examples

A. List all available configuration settings

The following example shows how to list all configuration options.

EXEC sp_configure;

The result returns the option name followed by the minimum and maximum values for the option. The config_value is the value that PolyBase will use when reconfiguration is complete. The run_value is the value that is currently being used. The config_value and run_value are usually the same unless the value is in the process of being changed.

B. List the configuration settings for one configuration name

EXEC sp_configure @configname='hadoop connectivity';

C. Set Hadoop connectivity

This example sets PolyBase to option 7. This option allows PolyBase to create and use external tables on Hortonworks HDP 2.1, 2.2, and 2.3 on Linux and Windows Server, and Azure Blob Storage. For example, SQL could have 30 external tables with 7 of them referencing data on Hortonworks HDP 2.1 on Linux, 4 on Hortonworks HDP 2.2 on Linux, 7 on Hortonworks HDP 2.3 on Linux, and the other 12 referencing Azure Blob Storage.

--Configure external tables to reference data on Hortonworks HDP 2.1, 2.2, and 2.3 on Linux, and Azure Blob Storage  
  
sp_configure @configname = 'hadoop connectivity', @configvalue = 7;  
GO  
  
RECONFIGURE  
GO

Next steps