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No decision data store nodes defined

Updated on July 5, 2022

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.


  1. In the header of Dev Studio, click ConfigureDecisioningInfrastructureServicesDecision Data Store.
  2. Click Add node.
  3. Select an available Pega Platform node to become a decision data store node.
  4. Click Submit.
    Result: The status of the new node is JOINING.
  5. Click Refresh to ensure that the status of the decision data store node changes to NORMAL.
    Decision Data Store service with a working decision data node
    The Decision Data Store tab shows a node with the normal status.

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