Hands-On Implementation of the Raft Algorithm With TypeScript
The Raft Algorithm is a distributed consensus algorithm designed to be easy to understand and implement. It is commonly used in distributed systems, such as distributed databases and file systems, to ensure data consistency and availability. Some real-life applications of the Raft Algorithm include etcd, CockroachDB, and TiDB.First, let's set up a new TypeScript project using Yarn. In your terminal, run the following commands:This will create a new package.json file, install the TypeScript compiler as a development dependency, and create a tsconfig.json file for your project.Before we start implementing the Raft Algorithm, let's define some types and enums to represent the different components of the algorithm.These types and enums will represent the different components of the Raft Algorithm, such as terms, logs, and nodes.First, let's implement the requestVote function that candidates use to request votes from followers. Here’s what that looks like:This function takes an Node Configuration object and an RequestVoteRPC object as input and returns an RequestVoteResponse object. It checks the RPC term, the voter's current term, and the voter's log to determine whether to grant a vote to the candidate. Next, let the appendEntries leaders use the function to replicate log entries and manage the commit index.This function takes an NodeConfiguration object and an AppendEntriesRPC object as input and returns an AppendEntriesResponse object. It checks the RPC term, the previous log index, and term, and the node's log to determine whether to append the new entries to the log. Finally, let’s implement the startElection function, which followers use to start a new election when they have not received any communication from a leader.
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