Leader Election

What are Raft and Paxos? Consensus Algorithms Explained

Raft and Paxos are consensus algorithms that let a group of distributed nodes agree on a single value or an ordered sequence of operations even when some nodes…

What Is Consensus in Distributed Systems?

Consensus is the problem of getting a set of distributed nodes to agree on a single value despite some nodes failing or messages being delayed, solved in pract…

What is a Heartbeat in Distributed Systems?

A heartbeat in distributed systems is a small periodic signal one node sends to another (or to a coordinator) purely to prove it is still alive, and its absenc…

How Would You Design a Distributed Job Scheduler?

A distributed scheduler is a system that reliably triggers jobs at the right time across a fleet of worker nodes, using a durable job store, a leader-elected t…

How to Design a Distributed Cron Scheduler

A distributed cron scheduler stores job definitions with their schedule in a durable database, uses a leader-elected or lock-based trigger process to fire each…

What is the Raft Consensus Algorithm?

Raft is a consensus algorithm that lets a cluster of nodes agree on a single, replicated sequence of operations by electing one leader per term who owns all wr…

How Does Leader Election Work in Distributed Systems?

Leader election is the process by which nodes in a distributed cluster agree on a single node to coordinate a particular task, using a protocol (often built on…

What is the Split-Brain Problem in Distributed Systems?

Split-brain is a failure mode in a clustered system where a network partition causes two or more nodes to each believe they are the sole leader, resulting in m…

What is ZooKeeper Used for in DevOps?

Apache ZooKeeper is a distributed coordination service that provides a highly consistent, hierarchical key-value namespace used by other distributed systems to…