Low Level Design: Observability System Design
The Three Pillars of Observability Observability is the ability to understand the internal state of a system from its external […]
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Low Level Design: Role-Based Access Control (RBAC)
What Is Role-Based Access Control (RBAC)? Role-Based Access Control (RBAC) is an authorization model where permissions are assigned to roles,
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Low Level Design: Search Engine Architecture
Building a web-scale search engine is one of the most complex distributed systems problems in computer science. It requires crawling
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Low Level Design: Microservices Communication Patterns
Microservices decompose an application into independently deployable services. The communication layer between those services is where distributed systems complexity lives:
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Low Level Design: Dependency Injection and IoC Containers
Dependency Injection (DI) is a design pattern and the practical application of the Dependency Inversion Principle (DIP). It removes hard-coded
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Low Level Design: Data Pipeline Architecture
Pipeline Types: Batch, Micro-Batch, and Streaming Data pipelines exist on a spectrum from latency to throughput: Batch ETL: Scheduled Spark
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Low Level Design: Graph Processing at Scale
Why Graph Processing Is Hard A social network like Facebook or LinkedIn has billions of nodes (users) and hundreds of
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Low Level Design: Kubernetes Scheduler Internals
What the Scheduler Does The Kubernetes scheduler is a control plane component with a single job: assign unscheduled pods to
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Low Level Design: Database Replication
Database replication copies data from one database server to one or more replicas. Replication underpins high availability, horizontal read scaling,
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Low Level Design: Distributed File System
A distributed file system (DFS) stores data across multiple machines while presenting a unified namespace to clients. Google File System
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Low Level Design: Paxos Consensus Protocol
The Consensus Problem Distributed systems need multiple nodes to agree on a single value — which server is the leader,
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Low Level Design: Database Transaction Isolation Levels
Why Isolation Levels Exist A database must handle many concurrent transactions at once. The naive solution — run one transaction
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Low Level Design: Design Patterns for Distributed Systems
Why Distributed Systems Need Explicit Patterns In a monolith, a function call either succeeds or throws an exception — the
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Low Level Design: Search Typeahead System
Search typeahead (autocomplete) is one of the most latency-sensitive features in any search product. Users expect suggestions to appear within
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Low Level Design: HyperLogLog and Approximate Counting
Counting distinct elements is one of the most common operations in analytics: how many unique visitors hit your site today,