Leader Election Patterns
Explore leader election mechanisms: Bully Algorithm, Ring Algorithm, ZooKeeper ephemeral nodes, and lease-based elections.
01.Why Leader Election is Essential in Distributed Architecture
Many distributed systems follow a Primary-Worker (Leader-Follower) topology where a single coordinator node is designated to perform centralized decision-making:
- Partition Assignment: Assigning Kafka topic partitions or database shards to active worker pods.
- Transaction Serialization: Ordering mutations to prevent race conditions on shared state.
- Distributed Scheduling: Ensuring a scheduled batch job (cron) executes exactly once across a 1,000-node cluster.
When the active leader crashes, experiences a hardware failure, or is partitioned, the cluster must automatically, deterministically, and rapidly elect a new leader without human intervention.
ZooKeeper Ephemeral Sequential Node Leader Election 👑
ZooKeeper Ephemeral Sequential Node Leader Election 👑
Nodes create sequential ephemeral z-nodes; the lowest index becomes leader.
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