SQL Server Polybase in Failover cluster instance

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Since SQL Server 2017, you can install Polybase in SQL Server Failover cluster instance.

SQL Server Polybase Dms and SQL Server Polybase Engine are created in Failover cluster, mapping to SQL Server Polybase Data Movement and SQL Server Engine respectively.

Failover Cluster Manager File Action View Help zfr]l O d Failover Cluster Manager luster.contoso.com Nodes v Storage Pools Enclosures Networks Cluster Events Roles (1) Nama SQL Server (SQL 19) Status @Running Cwnar Node win2019 Status (D Online (D Online (D Online (D Online @onlin Online P hoity Information SQL Server (SQL19) Cluster Disk I Name: sqICIuster Resou-ces SQL (SOLIS) SQL Server Agent (SQL 19) SQL Server cap (SOLIS) SQL Sarver Polybase Dms (SQL IS) SQL Server Polybase Engine (SQL IS)

 

 

And following two registers keys are created in all the nodes.

Computer\HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\SQLPBENGINE$InstanceName

Computer\HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\SQLPBDMS$SQL19

Registry Editor File Edit View Favorites Help Computer\HKEY LOCAL smbdirect SmbWitness smphost SMSvcHost 40.00 SNMPTRAP spacepot SpbCx Spooler sppsvc SQLAgentSSQL1g la SQL8rowser SQLP8DMSSSQL1g SQLP8ENGINESSQL1g SQLTELEMETRYSSQLIS A Name el (Default) Type REG SZ ab DependOnService REG ab Description DisplayName ab Environment ErrorControI ImagePath ObjectName $8] Type MULTI SZ REG SZ REG SZ REG MULTI SZ REG DWORD REG EXPAND SZ REG SZ REG DWORD REG DWORD REG DWORD (value not set) MSSQLSSQLIY Creates, coordinates and executes the parallel query plan against external data sources. SQL Server Poly8ase Engine (SQL IS) COMPUTERNAME=SQLCLUSTER CLUSTER NETWORK FQDN =SQLCLUSTER.contoso.com CLUSTER NETWORK HOSTNAME =SQLCLUSTER CLUSTER NETWORK NAME =SQLCLUSTER DxDDDDDD01 (1) Files\Microsoft SQL Server\MSSQLI -dweng - Polybase contoso\stswordman DxDDDDDD01 (1) DxDDDDDDD3 (3) DxDDDDD010 (16)

 

 

Here are some cases that cause SQL Server Polybase engine fail to start.

1.TCP/IP Protocol is disabled.

2.Polybase engine service fail to connect SQL Server instance.

3.Polybase engine service account does not have permission to access database [DWConfiguration],[DWDiagnostics] and [DWQueue]

4.The  SQL Server Polybase engine Roles does not exist in Failover cluster.

1)In this case, you need to manually add the role back to failover cluster. Please note, the register is removed accidently, you can't add it back.

2)Set Dependency

 

3)Check 'Use Network Name for computer name'

 


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