Final Exam - Comprehensive Review Cheatsheet

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Part 1: HDFS and distributed storage (Lectures 19–21)

Worked review example: client traffic

Part 2: Spark execution, joins, and machine learning (Lectures 20–26)

RDDs, actions, and partitions

Choose a join in two steps

Worked review example: a small lookup table

Decision trees and PLANET

Part 3: Cassandra placement and quorums (Lectures 28–31)

Walk the ring from the partition key

Quorum overlap

Worked review examples: the strict boundary

Part 4: Kafka reliability and throughput (Lectures 32–34)

Every ISR, not just the minimum

Retry does not imply exactly-once effects

Groups and partitions determine parallelism

Part 5: BigQuery and cloud (Lectures 35–40)

Correlated array expansion

Stored data, external data, and query definitions

Part 6: Supporting systems and foundations

Locks exclude overlap; join establishes order

Worked review example: both updates occur

SQL and storage vocabulary