Night-before cheat sheet

Part VI: Distributed Systems & Request Lifecycle

12 chapters (73–84). 0 key facts to review.

Chapters at a glance

73 The unified gateway pattern: one API in front of many backends
74 AuthN vs AuthZ: the distinction interviewers test on
75 Identity propagation across service boundaries
76 Rate limiting algorithms: token bucket, leaky bucket, sliding window, GCRA
77 Backpressure, flow control, and queue theory
78 Idempotency keys and exactly-once semantics
79 Sync, async, SSE, WebSocket, batch: five execution modes
80 Workflow orchestration: Temporal vs Airflow vs Step Functions vs Cadence
81 Inter-service trust patterns
82 The operations service pattern: why job lifecycle is its own SoR
83 Metering and billing pipelines
84 Telemetry firehoses: Kafka as the backbone

Key facts (from quizzes)

Other parts
Part I Part II Part III Part IV Part V Part VI Part VII Part VIII Part IX Part X