Why Distributed Systems Use Leader Election Instead of Repeated Locking

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Distributed locking ensures only one node accesses a shared resource at a time, but repeatedly competing for locks on every operation introduces unnecessary overhead. Leases and fencing tokens were added over time to handle crashed nodes and stale ownership, yet these mechanisms still require contention on each execution cycle. Leader election offers a more efficient alternative by designating one node as a long-lived coordinator, eliminating the need to re-compete for every task. Once a leader is elected, it handles recurring responsibilities such as job scheduling and cluster coordination until a failure triggers a new election. This shift moves distributed systems from asking 'who owns this operation right now' to maintaining stable, role-based coordination across nodes.

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