Managing decision data nodes

For each decision data node that is listed on the Services landing page, you can perform certain actions, depending on the service.

1. Click Designer Studio > Decisioning > Infrastructure > Servicesand access the service whose nodes you want to manage.
2. For the selected node, expand the Execute menu and select one of the available actions. Available actions include:
• Start – Activates the decision data node. The status of that node changes to NORMAL.
• Stop – Deactivates the decision data node. The status of that node changes to STOPPED.
• Repair – Removes inconsistencies across all replicas of the data sets in a decision data node. Run this operation in the following cases:
  • As part of node recovery, when bringing a node back into the cluster after a failure.
  • As part of the maintenance of nodes containing data that is not frequently read.
  • As part of the update process of nodes that were offline.
• Compact – Invokes the process in which the Cassandra database combines multiple physical data files on the file system to improve the performance of partition scans and to reclaim space from deleted data. Compaction is a background operation that runs on a regular basis across all nodes in the decision data node cluster, but you can run it explicitly on one decision data node by using the Compact action.

  Caution: The compaction operation causes a temporary spike in disk usage and disk I/O. Do not run this operation during peak usage hours on multiple decision data nodes concurrently, because it affects performance for any process or request accessing the decision data node storage.

• Clean up – Removes keys that no longer belong to the decision data node. Keys do not belong to a decision data node if data was decommissioned, or if the node was rebalanced within the decision data node cluster.

  Caution: The compaction operation causes a temporary spike in disk usage and disk I/O. Do not run this operation during peak usage hours on multiple decision data nodes concurrently, because it affects performance for any process or request accessing the decision data node storage

• Decommission – Removes the node from the decision data node clusterThe data contained in the decision data node storage is transferred to other nodes in the decision data node cluster.

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