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Name : Cassandra.md

Version : 1.0.0 Author : A'nil Cyborg Author URI : https://aliens.dev Requires : Aliens Wiki HIEN…

Overview

Name : Cassandra.md — Quick Facts

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Property: Detail

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Full Name: Apache Cassandra

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Type: Distributed Wide-Column NoSQL…

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License: Apache License 2.0 (open-source)

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Infobox

📚 | Property | Detail | |---|---| | Full Name | Apache Cassandra | | Type | Distributed…

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History & Origin

💡 | Year | Event | |---|---| | 2007 | Facebook engineers Avinash Lakshman (Amazon Dynamo…

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Architecture Overview

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Imagine ek circular ring (0 to…

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Har node ko ring pe ek ya multiple…

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Data ka partition key hash hota…

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Vnodes ke saath: ek physical node…

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Data Model

⭐ Cassandra ka data model relational database se fundamentally different hai: | Concept |…

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Write Path

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Commit Log = append-only,…

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Memtable = in-memory data…

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SSTable (Sorted String Table) =…

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No read-before-write = Cassandra…

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Read Path

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Probabilistic data structure —…

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False positives possible hain…

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Unnecessary SSTable reads avoid…

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Consistency Model

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Cassandra = AP system…

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Lekin QUORUM pe use karo to strong…

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Formula: R + W > RF → strong…

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Example: RF=3, QUORUM read (2) +…

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Replication

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RF=1: No replication (1 copy) — ek…

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RF=2: 2 copies — 1 node down…

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RF=3: Standard production — 1 node…

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RF=5: High availability use cases

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Compaction Strategies

📚 SSTables immutable hain — time ke saath bahut saare SSTables accumulate hote hain.…

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CQL — Cassandra Query Language

💡 CQL SQL jaisa dikhta hai, lekin fundamentally different hai: | Feature | CQL (Cassandra)…

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Use Cases

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Heavy ad-hoc queries / analytics…

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Complex transactions (multi-table…

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Small dataset (<10GB) — overkill,…

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Heavy read-update-read patterns…

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Cassandra vs Other Databases

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Ecosystem & Distributions

🔑 | Product / Tool | Type | Description | |---|---|---| | DataStax Enterprise (DSE) |…

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Common Mistakes

✨ Mistake 1: Relational Data Modeling Apply Karna Sabse bada mistake: tables ko normalized…

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Best Practices

🌟 1. Query-First Data Modeling Pehle apne application ki access patterns list karo (Q1:…

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Interview Questions & Answers

🚀 Q1: Cassandra kya hai aur ye traditional RDBMS se kaise different hai? Answer: Apache…

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Glossary

📚 | Term | Meaning | |---|---| | Cassandra | Apache Cassandra — distributed, wide-column…

Comparison

Cassandra vs Other Databases

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Type: Wide-column NoSQL

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Architecture: Peer-to-peer (masterless)

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Single Point of Failure: No

Diagram

Visual Flow

📊 Diagram visualization — details in narration

Quiz — Question 1

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Quiz — Question 2

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