Md. Sany Ahmed sany2k8

1. What Spark Is (And Is Not)

Spark is NOT:

just a SQL engine
just a query engine

Spark IS:

A general-purpose distributed data processing engine capable of ETL, analytics, and machine learning.

1. What Impala Is (And Is Not)

Impala is NOT:

a storage engine
a file format
a batch processing system

Impala IS:

1. First Principle: What a Hive Table Really Is

A Hive table is NOT:

a storage engine
a file format
a database that owns data

A Hive table IS:

1. Example Dataset (Logical View)

Assume this dataset coming from an ingestion job:

order_id	country	product	amount
1	US	Book	120
2	IN	Pen	20
3	US	Book	300
4	IN	Pencil	10

🧭 Big Data Ecosystem Overview

This document explains how the main components of the Hadoop-based Big Data ecosystem connect and work together: Hue, Hive, Impala, HDFS, Spark (PySpark), HBase, Iceberg, Parquet, ORC, Oozie, and Teradata.

🧱 Core Components and Their Roles

Component	Type	Purpose

Typos & Corrections

Original Text (on page)	Issue	Suggested Correction
“List sroted pods”	Typo	“List sorted pods”
“List pods using a different output”	Wording unclear	Could be: “List pods with different output formats”
“View all cotainers logs…”	Typo	“View all containers logs…”
“locahost-port”	Typo	“localhost-port”
“hosts-port”	Wording	Better: “host-port”
**“

Search Type	Speed	Accuracy	Flexibility	Storage	Best For
Exact Match	⭐⭐⭐⭐⭐	⭐⭐⭐⭐⭐	⭐	⭐⭐⭐⭐⭐	IDs, codes, filters
Pattern Match	⭐⭐⭐⭐	⭐⭐⭐	⭐⭐⭐	⭐⭐⭐⭐	Autocomplete, prefixes
Full-Text	⭐⭐⭐	⭐⭐⭐⭐	⭐⭐⭐⭐	⭐⭐⭐	Documents, articles
Vector / Semantic	⭐⭐	⭐⭐⭐⭐⭐	⭐⭐⭐⭐⭐	⭐⭐	Recommendations, concepts
Fuzzy	⭐⭐	⭐⭐⭐	⭐⭐⭐⭐	⭐⭐⭐	Typos, data cleaning

Scenario	Best Choice	Alternative / Avoid
User login/auth	Exact Match	All others
Product SKU lookup	Exact Match	All others
Autocomplete	Pattern Match (prefix)	Fuzzy, Vector
Blog search	Full-Text	Vector + Full-Text, Pattern
Recommendation	Vector + Full-Text	Pattern
Exact Data with typos	Fuzzy	Pattern, Exact
Multi-language content	Vector + Full-Text	Pattern
Real-time search	Exact / Pattern	Full-Text, Vector

	flowchart TD

	%% =============================
	%% Global Layout Tweaks
	%% =============================

	%% Make arrows thicker and more visible
	linkStyle default stroke-width:2px,stroke:#555,opacity:0.9;

	-- CREATE EXTENSION IF NOT EXISTS postgis;
	-- CREATE EXTENSION IF NOT EXISTS pgvector;

	------------------------------ Exercise 1 ------------------------------
	-- Table setup
	CREATE TABLE products (
	id SERIAL PRIMARY KEY,
	sku VARCHAR(20) UNIQUE,
	name VARCHAR(200),
	category VARCHAR(50),