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ML System Design·Intermediate

ML Model Deployment Fundamentals: Shipping Safely in Production

A practical foundation for deploying ML models: packaging, serving topologies, rollout strategies, and post-deploy monitoring. Covers shadow mode, canary releases, drift detection, and rollback design.

35 min read 6 sections 5 interview questions
Model DeploymentMLOpsCanary ReleaseShadow ModeDrift DetectionServing InfrastructureRollbackMonitoringModel Registry

Deployment Is a Reliability Problem

A trained model is not a product. Deployment converts model artifacts into reliable user-facing behavior under latency, cost, and correctness constraints.

Baseline deployment stack:

  • model registry and versioning,
  • reproducible serving image,
  • rollout policy (shadow/canary),
  • online observability and rollback.

Safe Deployment Path

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Rollout Strategies

StrategyBenefitRiskWhen to Use
ShadowNo user impact validationNo behavioral feedbackfirst validation of new model service
CanaryControlled exposureslow confidence builddefault for production rollouts
Blue/GreenFast switch and rollbackinfra duplication coststrict uptime environments

DRIFT Deployment Checklist

01

Define

Set launch gates: quality, latency, cost, fairness.

02

Reason

Map serving dependencies (features, preprocessing, model runtime).

03

Identify failure

Train-serve skew, drift, throughput collapse, calibration shifts.

04

Fix

Feature parity checks, canary guardrails, rollback automation.

05

Test

Replay tests + live canary monitoring by slice.

Post-Deploy Failure Modes

FailureSignalMitigation
Train-serve skewoffline good, online poorshared feature definitions + parity tests
Data driftfeature distribution shiftsdrift alerts and retraining triggers
Latency regressionp99 spikesmodel optimization or traffic throttling
Calibration decayprobability reliability dropsrecalibration and threshold updates
TIP

Interview Summary

Strong answer: deployment = staged risk reduction + observability + rollback.

Interview Questions

Click to reveal answers