Peer-to-peer systems treat each cluster node as equal; there is no strict leader. This means there is no explicit leader election process as happens in the Leader and Followers pattern. However, there still needs to be one cluster node acting as cluster coordinator for tasks such as assigning data partitions to other cluster nodes and tracking when new cluster nodes join or fail and take corrective actions. Unmesh Joshi explains how this is resolved with an Emergent Leader
https://martinfowler.com/articles/patterns-of-distributed-systems/emergent-leader.html
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