leader node

A single Dgraph process in the data domain cluster responsible for receiving and processing updates to the index and configuration. This node can also be configured to process queries, like other nodes. This node is responsible for generating information about the latest versions of the index and propagating this information to the follower nodes.

When you create a new data domain cluster, the Endeca Server software creates and starts the leader node and then the follower nodes. Each data domain cluster (that is not read-only) is created with one leader node and a specified number of follower nodes.

The leader node periodically receives full or incremental index updates. It also receives administration or configuration updates. It is the only node in the data domain cluster that makes updates to the index. After processing updates, the leader publishes a new version of the data and notifies all follower nodes, alerting them to start using the updated version of the index. The follower nodes acquire read-only access to an updated version of the index.

See also follower node, data domain cluster, and Endeca Server cluster.