Skip to content

2026#

  • in algo
  • 7 min read

Consistent Hashing

This post is an AI-generated summary of the Medium article Advanced Algorithms Every Senior Developer Must Know: Part 2 — Consistent Hashing from Sourav Chaurasia. It is intended as a concise reference to the key ideas.

Consistent hashing solves one problem: when the number of servers changes, not every stored key should have to move to a different server. Here, a key can be a cached object, a user session, or a database record. If almost every key gets remapped after adding or removing one server, caches are invalidated and a lot of data has to be redistributed.

  • in algo
  • 7 min read

Merkle Trees (Hash Trees)

This post is an AI-generated summary of the Medium article Advanced Algorithms Every Senior Developer Must Know: Part 1 — Merkle Trees from Sourav Chaurasia. It is intended as a concise reference to the key ideas.

What Is a Merkle Tree?

A Merkle tree (also called a hash tree) is a binary tree structure invented by Ralph Merkle in 1979. It recursively hashes and combines data blocks to produce a single root hash, which serves as a cryptographic fingerprint of the entire dataset. It is used in many systems like Bitcoin, Git, IPFS, and Cassandra for efficient data verification and integrity.

Windows 11 WSL2 DNS and OpenVPN Split Tunnel

On modern Windows 11 + WSL 2, the reliable VPN-friendly DNS path is WSL DNS tunneling. If you want Linux tools inside WSL to follow the same DNS policy as Windows apps, keep /etc/resolv.conf auto-generated and let the Windows DNS Client make the routing and suffix decisions.

This post focuses on the current Windows 11 + WSL 2 model, not the older manual resolv.conf workaround. It also shows how to keep OpenVPN in split-tunnel mode while preserving internal DNS resolution in both Windows and WSL.