No decision data store nodes defined
During processing of a data flow work item with the state management option set to Database, the following error is displayed: DNodeException: Unable to obtain session. Cassandra hasn't been started or is unavailable.
No node has been defined in the Decision Data Store service. You need to define a decision data store node.
In the header of Dev Studio, click.
Click Add node.
Select an available Pega Platform node to become a decision data store node.
Click Submit.The status of the new node is JOINING.
Click Refresh to ensure that the status of the decision data store node changes to NORMAL.