DBRaven

Compare Scenarios

Side-by-side comparison with decision path analysis. Every dimension traces back to topology, risk propagation, simulation, and advisor intelligence.

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Topology
Simulation
Advisor

Select Scenarios to Compare

Left Scenario

Right Scenario

Comparing Write-Heavy Transactional Platform vs Streaming Media Platform

Topology at a Glance

Write-Heavy Transactional PlatformStreaming Media Platform
11Components21
5Connections0
4Failure Modes6
3Propagation Paths3
1High / Critical4
0Mitigations Mapped0
highMax Exposurehigh
Bold = lower risk·Mitigations bold = more coverage

Architecture Comparison

Write-Heavy Transactional Platform is both simpler and lower-risk than Streaming Media Platform

Write-Heavy Transactional Platform is the simpler architecture. Write-Heavy Transactional Platform carries lower operational risk. They share 3 component(s). Write-Heavy Transactional Platform has 4 unique risk(s); Streaming Media Platform has 6.

Limited confidence

Left

Write-Heavy Transactional Platform
highExperienced Backend Team

11

Nodes

5

Edges

4

Risks

3

Seeds

2

Strengths

4

Adv. Risks

Right

Streaming Media Platform
highExperienced Backend Team

21

Nodes

0

Edges

6

Risks

3

Seeds

0

Strengths

6

Adv. Risks

Comparison Dimensions

Complexity

Write-Heavy Transactional Platform

Write-Heavy Transactional Platform

high complexity, 11 nodes, 5 edges, 4 risks, 3 simulation seeds

Streaming Media Platform

high complexity, 21 nodes, 0 edges, 6 risks, 3 simulation seeds

Write-Heavy Transactional Platform is simpler: high operational complexity with 11 topology nodes vs 21 for Streaming Media Platform.

Operational Risk

Write-Heavy Transactional Platform

Write-Heavy Transactional Platform

4 risks (top: high), 3 high/critical, 0 confirmed by simulation

Streaming Media Platform

6 risks (top: high), 5 high/critical, 0 confirmed by simulation

Write-Heavy Transactional Platform has lower operational risk: weighted severity score 14 vs 22 (0 vs 0 simulation-confirmed).

Scalability

Streaming Media Platform

Write-Heavy Transactional Platform

4 scaling thresholds, 3 migration paths, 4 advisor scaling signals

Streaming Media Platform

4 scaling thresholds, 3 migration paths, 4 advisor scaling signals

Streaming Media Platform has more defined scaling paths: 4 thresholds and 3 migration paths.

Operational Maturity

Tie

Write-Heavy Transactional Platform

Advisor assessment: Advanced; recommended team: Experienced Backend Team; 7 operational requirements

Streaming Media Platform

Advisor assessment: Advanced; recommended team: Experienced Backend Team; 14 operational requirements

Both scenarios require equivalent team maturity: Advanced.

Observability

Write-Heavy Transactional Platform

Write-Heavy Transactional Platform

6 watched metrics, 4 observability recommendations, 3 simulation seeds

Streaming Media Platform

8 watched metrics, 7 observability recommendations, 3 simulation seeds

Write-Heavy Transactional Platform has lower observability burden: 6 watched metrics vs 8.

Generator Readiness

Depends

Write-Heavy Transactional Platform

generator relevance documented; topology generation relevance noted; simulation relevance noted; 3 seeds with generator notes

Streaming Media Platform

generator relevance documented; topology generation relevance noted; simulation relevance noted; 3 seeds with generator notes

Both scenarios have comparable generator readiness at this stage. Generator support is preliminary. Neither scenario should be treated as fully generation-ready.

Architecture Components

Only in Write-Heavy Transactional Platform (8)

Connection Pooling· architecture patternTransactional Outbox Pattern· architecture patternCheckpoint Amplification· operational riskLock Contention· operational riskWAL Saturation· operational riskWrite Amplification Cascade· operational riskHigh-Throughput OLTP· workloadWrite-Heavy Transactional· workload

Only in Streaming Media Platform (18)

Consistency Guarantees

Only Write-Heavy Transactional Platform (1)

Atomic multi-object

Moving from Write-Heavy Transactional Platform to Streaming Media Platform

Atomic multi-object

Green = kept, red = lost (the target explicitly excludes it), amber = unproven (the target has made no claim, not the same as losing it).

Only 'Write-Heavy Transactional Platform' claims: atomic_multi_object.

Tradeoff Summary

Complexity vs Risk

Write-Heavy Transactional Platform has high complexity. Streaming Media Platform has high complexity. Simpler systems often carry different (not necessarily fewer) risks.

Write-Heavy Transactional Platform

Write-Heavy Transactional Platform: 4 risks (top: high), 3 high/critical, 0 confirmed by simulation

Streaming Media Platform

Streaming Media Platform: 6 risks (top: high), 5 high/critical, 0 confirmed by simulation

Scaling Path

Write-Heavy Transactional Platform offers 4 defined scaling thresholds. Streaming Media Platform offers 4. More defined paths means clearer evolution steps but also more anticipated growth.

Write-Heavy Transactional Platform

4 scaling thresholds, 3 migration paths, 4 advisor scaling signals

Streaming Media Platform

4 scaling thresholds, 3 migration paths, 4 advisor scaling signals

Architecture Strengths vs Risks Balance

The advisor identifies strengths and risks grounded in knowledge relationships. A higher strengths-to-risks ratio suggests better mitigation coverage in the current topology.

Write-Heavy Transactional Platform

2 strengths, 4 risks

Streaming Media Platform

0 strengths, 6 risks

Migration Considerations

Migration Step 1

Write-Heavy Transactional Platform

Single PostgreSQL with synchronous dual-write (DB + Kafka in application code) → PostgreSQL + outbox pattern + WAL CDC relay to Kafka

Streaming Media Platform

Synchronous transcoding in the upload request handler (blocking API response) → Async transcoding via Kafka topic with competing consumer workers

Both scenarios define a migration step at this stage. Write-Heavy Transactional Platform: triggered by 'Dual-write inconsistency events observed in production: DB w'. Streaming Media Platform: triggered by 'Upload API p99 exceeding 30 seconds due to in-process transc'.

Migration Step 2

Write-Heavy Transactional Platform

PostgreSQL + PgBouncer + outbox + Kafka CDC → Domain-partitioned PostgreSQL + separate write services per partition

Streaming Media Platform

Viewing history in PostgreSQL → Viewing history in Cassandra

Both scenarios define a migration step at this stage. Write-Heavy Transactional Platform: triggered by 'Primary write CPU > 70% sustained during peak windows; WAL v'. Streaming Media Platform: triggered by 'PostgreSQL viewing history table exceeding 500M rows; write '.

Migration Step 3

Write-Heavy Transactional Platform

PostgreSQL + Kafka CDC → Event sourcing: append-only event log with read model projections

Streaming Media Platform

Single CDN provider with no origin rate limiting → Multi-CDN with origin request coalescing and rate limiting

Both scenarios define a migration step at this stage. Write-Heavy Transactional Platform: triggered by 'Audit completeness requirements grow beyond point-in-time ba'. Streaming Media Platform: triggered by 'CDN provider incident causing total origin failover; CDN mis'.

Advisor Notes

Write-Heavy Transactional Platform

Strength: Write-heavy transactional workloads that emit downstream events (order placed, payment captured) benefit from the outbox pattern…

Write-heavy transactional workloads that emit downstream events (order placed, payment captured) benefit from the outbox pattern to ensure events are published exactly when the database transaction commits: never before, never after. Key trade-off: Adds one INSERT per transaction to the outbox table: minor but nonzero write amplification. Operational note: Outbox table grows with write volume: implement TTL-based cleanup or partition pruning. Evidence: Payment processors like Stripe use outbox-style patterns to ensure webhook delivery matches transaction commits.

Write-Heavy Transactional Platform

Risk (high): Write Amplification Cascade

Each logical application write triggers multiple physical writes through index maintenance, WAL generation, MVCC versioning, and replication, causing actual disk IOPS to exceed the provisioned I/O ceiling while the logical write rate appears modest.

Streaming Media Platform

Risk (high): Queue Backlog Accumulation

Message queue or event stream consumer processing rate falls below producer write rate, causing consumer lag to grow unboundedly: eventually leading to increased end-to-end latency, producer backpressure, data expiry, or queue resource exhaustion.

Both

Shared Operational Requirements

Both scenarios require: Apache Kafka: scenario has team_maturity below senior, Apache Kafka: scenario uses Kafka for event streaming or CDC, Event stream operations expertise.

Supporting Evidence · 15 items

Scenario
write_heavy_transactional_platformScenario 'Write-Heavy Transactional Platform' provides composition, operational complexity, scaling thresholds, migration paths, and team maturity requirements.
Scenario
streaming_media_platformScenario 'Streaming Media Platform' provides composition, operational complexity, scaling thresholds, migration paths, and team maturity requirements.
Scenario
write_heavy_transactional_platformScenario 'Write-Heavy Transactional Platform' claims consistency guarantee(s): atomic_multi_object.
Topology
write_heavy_transactional_platformTopology for 'write_heavy_transactional_platform': 11 nodes, 5 edges, 4 risk nodes.
Topology
streaming_media_platformTopology for 'streaming_media_platform': 21 nodes, 0 edges, 6 risk nodes.
Risk Path
prop_workload_profile_write_heavy_transactional_risk_wal_saturationWrite-Heavy Transactional → WAL Saturation
Risk Path
prop_workload_profile_write_heavy_transactional_risk_lock_contentionWrite-Heavy Transactional → Lock Contention
Risk Path
prop_workload_profile_event_streaming_workload_risk_queue_backlog_accumulationEvent Streaming → Queue Backlog Accumulation. also affects: Slow Consumer
Risk Path
prop_technology_profile_redis_risk_thundering_herdRedis → Thundering Herd (Cache Stampede)
Seed
write_heavy_transactional_platform__wal_saturation__generic_risk_probeTests how WAL Saturation manifests in Write-Heavy Transactional Platform under stress conditions. Involves 1 architecture component.
Seed
write_heavy_transactional_platform__lock_contention__generic_risk_probeTests how Lock Contention manifests in Write-Heavy Transactional Platform under stress conditions. Involves 1 architecture component.
Seed
streaming_media_platform__queue_backlog_accumulation__queue_backlogTests how Queue Backlog Accumulation manifests in Streaming Media Platform under stress conditions. Involves 2 architecture components.
Seed
streaming_media_platform__thundering_herd__generic_risk_probeTests how Thundering Herd (Cache Stampede) manifests in Streaming Media Platform under stress conditions. Involves 1 architecture component.
Advisor
advisor_write_heavy_transactional_platformAdvisor for 'Write-Heavy Transactional Platform': 2 strengths, 4 risks, maturity: advanced.
Advisor
advisor_streaming_media_platformAdvisor for 'Streaming Media Platform': 0 strengths, 6 risks, maturity: advanced.

Coverage Warnings

  • Streaming Media Platform: fewer than 2 architectural strengths identified. the risk/complexity dimensions are present but the strength analysis is thin. Consider enriching the relationship YAMLs referenced by this scenario to improve coverage.

Limitations

  • ·Comparison grounded in YAML knowledge only. Not measured from any production system.
  • ·Winner assessments are deterministic heuristics, not absolute recommendations. Context, team preferences, and workload specifics may change the conclusion.
  • ·6 seed type(s) across both scenarios do not have execution previews. Risk confirmation for those types is unavailable.
Final Architecture RecommendationPreliminary confidence

Write-Heavy Transactional Platform is the recommended starting point over Streaming Media Platform

Write-Heavy Transactional Platform leads on 3 weighted dimension(s): Complexity, Operational Risk, Observability. Weighted score: 5.5 vs 2.0 for Streaming Media Platform.

Decision Intelligence

Architecture Decision Path

Structured reasoning for choosing between Write-Heavy Transactional Platform and Streaming Media Platform. Every condition and trigger traces back to comparison dimensions, advisor insights, and topology evidence.

Write-Heavy Transactional Platform is the recommended starting point over Streaming Media Platform

Write-Heavy Transactional Platform leads on 3 weighted dimension(s): Complexity, Operational Risk, Observability. Weighted score: 5.5 vs 2.0 for Streaming Media Platform. The architectures share 3 component(s), reducing migration cost if you switch later. Write-Heavy Transactional Platform is the operationally simpler choice.

Recommendation:Left
Confidence Preliminary

Where to Start

Start with Write-Heavy Transactional Platform

Left

Write-Heavy Transactional Platform has lower operational complexity. Starting here reduces risk and cognitive load. Migrate to the more capable architecture only when you hit concrete scaling or feature limits.

Complexity: high complexity, 11 nodes, 5 edges, 4 risks, 3 simulation seeds

Migrate when:

  • PgBouncer wait_queue > 0 sustained; application p99 write latency rising faster than PostgreSQL p99; pool_mode=transaction showing >80% utilization → Increase PgBouncer pool_size incrementally; profile transaction duration to right-size pool; consider separate pools for write-heavy and read-only workloads
  • PostgreSQL checkpoint_completion_target warnings in logs; wal_buffers flushing more than once per second; pg_stat_bgwriter shows checkpoints_req rising; write p99 > 20ms without query explanation → Tune checkpoint_completion_target to 0.9; increase wal_buffers to 64MB; move PostgreSQL WAL to a dedicated NVMe volume separate from data directory
  • pg_locks shows contended rows with wait events > 5ms; write throughput plateauing despite available CPU; deadlock errors appearing in application logs → Partition the hot table by entity range or hash; introduce optimistic locking with retry for high-contention entities; consider queue-per-entity serialization via application-level lock tokens

Decision Flow

1

Does your team have the operational maturity to run Write-Heavy Transactional Platform (advanced rating)?

If Yes

Your team can operate Write-Heavy Transactional Platform. Continue to Step 2 to refine based on risk tolerance and workload fit.

If No

Prefer the lower-maturity option: right scenario.

Right
2

Is operational stability and minimising production risk your primary concern over feature richness or scalability ceiling?

If Yes

Prefer Write-Heavy Transactional Platform: it carries lower operational risk weight per the advisor's assessment.

Left

If No

Proceed to Step 3 to evaluate based on scaling requirements.

3

Do you expect your load to reach: Kafka consumer group lag on the transcoding topic growing during peak upload hours; content availability delay > 10 minutes for newly uploaded videos; transcoding worker CPU consistently above 85% across all instances ?

If Yes

Right scenario has more defined scaling evolution paths for this growth pattern.

Right

If No

If you don't expect to hit these scaling signals soon, prefer the simpler architecture and re-evaluate when load patterns become clearer.

4

Is operational simplicity (fewer moving parts, easier debugging, lower ops burden) more important than maximum architectural capability?

If Yes

Write-Heavy Transactional Platform is the simpler choice: Write-Heavy Transactional Platform is simpler: high operational complexity with 11 topology nodes vs 21 for Streaming Media Platform.

Left

If No

If capability and scalability ceiling matter more than simplicity, evaluate the higher-complexity scenario against your specific load model.

When to Choose Each Scenario

Write-Heavy Transactional Platform

Left

When operational simplicity is a top priority

High

Write-Heavy Transactional Platform has lower operational complexity: fewer moving parts, easier to reason about and debug.

When stability and predictability matter most

Critical

Write-Heavy Transactional Platform carries lower overall risk weight per the advisor's assessment.

When you want to minimise monitoring setup overhead

Moderate

Write-Heavy Transactional Platform has a lower observability burden: fewer watched metrics and monitoring targets.

When your architecture benefits from: write-heavy transactional workloads that emit downstream events (order placed, payment captured) benefit from the outbox pattern…

Moderate

Write-heavy transactional workloads that emit downstream events (order placed, payment captured) benefit from the outbox pattern to ensure events are published exactly when the database transaction commits: never before, never after. Key trade-off: Adds one INSERT per transaction to the outbox table: minor but nonzero write amplification. Operational note: Outbox table grows with write volume: implement TTL-based cleanup or partition pruning. Evidence: Payment processors like Stripe use outbox-style patterns to ensure webhook delivery matches transaction commits.

When your architecture benefits from: kafka is the standard downstream target for wal-based cdc pipelines: debezium captures database wal records and publishes them to…

Moderate

Kafka is the standard downstream target for WAL-based CDC pipelines: Debezium captures database WAL records and publishes them to Kafka topics, which downstream consumers process to maintain derived data stores, caches, and event-driven services. Key trade-off: Debezium replication slot holds WAL until consumed: disconnected Debezium can fill primary disk. Operational note: Debezium replication slot on PostgreSQL must be monitored: a lagging or disconnected Debezium causes replication slot WAL accumulation on the primary. Evidence: Debezium (Red Hat) captures PostgreSQL, MySQL, and MongoDB WAL and publishes to Kafka topics.

When your system requires decoupled async event processing

High

Write-Heavy Transactional Platform includes event stream infrastructure (e.g., Kafka/Kinesis), enabling async decoupling between producers and consumers.

Streaming Media Platform

Right

When you need well-defined scaling thresholds and migration paths

High

Streaming Media Platform has more documented scaling evolution steps (4 thresholds, 3 migration paths).

When your system requires decoupled async event processing

High

Streaming Media Platform includes event stream infrastructure (e.g., Kafka/Kinesis), enabling async decoupling between producers and consumers.

When to Avoid Each Scenario

Write-Heavy Transactional Platform

Left

When your team cannot mitigate: write amplification cascade

High

This architecture is significantly exposed to Write Amplification Cascade. Each logical application write triggers multiple physical writes through index maintenance, WAL generation, MVCC versioning, and replication, causing actual disk IOPS to exceed the provisioned I/O ceiling while the logical write rate appears modest.

When your team cannot mitigate: wal saturation

High

This architecture is significantly exposed to WAL Saturation. PostgreSQL WAL (Write-Ahead Log) generation rate exceeds wal_buffers flush capacity or downstream replica/WAL archive bandwidth, causing write transactions to stall waiting for WAL flush and replication lag to grow unboundedly.

When your team is early-stage or solo

High

Write-Heavy Transactional Platform is rated 'advanced'. It requires experienced backend engineers or platform tooling to operate reliably at scale.

When you expect rapid growth within the next 12–18 months

Moderate

The advisor identifies 7 predicted bottlenecks for Write-Heavy Transactional Platform. Rapid growth will surface these limitations quickly.

Streaming Media Platform

Right

When your team cannot mitigate: queue backlog accumulation

High

This architecture is significantly exposed to Queue Backlog Accumulation. Message queue or event stream consumer processing rate falls below producer write rate, causing consumer lag to grow unboundedly: eventually leading to increased end-to-end latency, producer backpressure, data expiry, or queue resource exhaustion.

When your team cannot mitigate: thundering herd (cache stampede)

High

This architecture is significantly exposed to Thundering Herd (Cache Stampede). When a popular cached key expires or a service recovers from downtime, all requests that were waiting or arrive simultaneously miss the cache and hit the origin database concurrently, producing a request spike that can overwhelm the database within seconds.

When your team is early-stage or solo

High

Streaming Media Platform is rated 'advanced'. It requires experienced backend engineers or platform tooling to operate reliably at scale.

When you expect rapid growth within the next 12–18 months

Moderate

The advisor identifies 9 predicted bottlenecks for Streaming Media Platform. Rapid growth will surface these limitations quickly.

Team Fit

Solo developer or small startup

Left

Write-Heavy Transactional Platform is more accessible for small teams. Fewer operational moving parts reduces on-call burden.

  • Validate that the simpler architecture can handle your projected load before committing.

Small product team (2–6 engineers)

Left

Write-Heavy Transactional Platform suits small teams that need to move fast without deep platform tooling investment.

  • Consider Streaming Media Platform only if your workload pattern specifically requires it.

Experienced backend team

Depends

An experienced team can operate either architecture. Choose based on workload fit, not team capability.

  • Prioritise alignment with existing infrastructure and tooling.
  • Streaming Media Platform may require additional runbook coverage and alerting investment.

Platform engineering team or SRE-equipped organisation

Right

A platform team can safely operate Streaming Media Platform and will benefit from its more advanced scaling characteristics.

  • Ensure observability and alerting are configured before launch.

Migration Triggers

LeftRightPlan

Migration Step 1

Both scenarios define a migration step at this stage. Write-Heavy Transactional Platform: triggered by 'Dual-write inconsistency events observed in production: DB w'. Streaming Media Platform: triggered by 'Upload API p99 exceeding 30 seconds due to in-process transc'.

LeftRightPlan

Migration Step 2

Both scenarios define a migration step at this stage. Write-Heavy Transactional Platform: triggered by 'Primary write CPU > 70% sustained during peak windows; WAL v'. Streaming Media Platform: triggered by 'PostgreSQL viewing history table exceeding 500M rows; write '.

LeftRightPlan

Migration Step 3

Both scenarios define a migration step at this stage. Write-Heavy Transactional Platform: triggered by 'Audit completeness requirements grow beyond point-in-time ba'. Streaming Media Platform: triggered by 'CDN provider incident causing total origin failover; CDN mis'.

LeftDependsAct Soon

PgBouncer wait_queue > 0 sustained; application p99 write latency rising faster than PostgreSQL p99; pool_mode=transaction showing >80% utilization

Tier 1: Connection Pool Saturation: PgBouncer pool_size too small for write concurrency profile. Recommended evolution: Increase PgBouncer pool_size incrementally; profile transaction duration to right-size pool; consider separate pools for write-heavy and read-only workloads .

LeftDependsAct Soon

PostgreSQL checkpoint_completion_target warnings in logs; wal_buffers flushing more than once per second; pg_stat_bgwriter shows checkpoints_req rising; write p99 > 20ms without query explanation

Tier 2: WAL and Checkpoint Pressure: Write rate exceeding PostgreSQL's WAL flush and checkpoint throughput. Recommended evolution: Tune checkpoint_completion_target to 0.9; increase wal_buffers to 64MB; move PostgreSQL WAL to a dedicated NVMe volume separate from data directory .

RightDependsAct Soon

Kafka consumer group lag on the transcoding topic growing during peak upload hours; content availability delay > 10 minutes for newly uploaded videos; transcoding worker CPU consistently above 85% across all instances

Tier 1: Transcoding Worker Throughput: Transcoding consumer group undersized relative to peak upload volume. Recommended evolution: Increase transcoding consumer instances up to the transcoding topic partition count; tune partition count to match the maximum desired worker parallelism (set this at topic creation, not after lag appears); implement per-uploader upload rate limits to smooth burst input; consider priority queuing so premium-tier content does not wait behind bulk ingest jobs .

RightDependsAct Soon

MinIO GET request rate spikes > 10x baseline immediately after content publish or CDN invalidation; MinIO p99 latency > 500ms; CDN miss ratio > 5% on popular content

Tier 2: CDN Origin Thundering Herd: CDN cache miss storm on first-play of new or recently-updated content. Recommended evolution: Implement origin request coalescing (single origin fetch per CDN node per object, queue subsequent requestors for the in-flight response); pre-warm CDN edges for anticipated high-traffic content before publish; add rate limiting at the origin gateway to cap per-second origin requests per content_id .

Readiness Requirements

Apache Kafka: scenario has team_maturity below senior

Both

Kafka operational complexity requires dedicated expertise: consider MSK or Confluent Cloud to reduce ops burden

Required maturity: senior

Apache Kafka: scenario uses Kafka for event streaming or CDC

Both

Set min.insync.replicas=2 with acks=all; monitor consumer lag as primary health signal

Required maturity: senior

Event stream operations expertise

Both

This architecture includes event stream infrastructure (Kafka, Kinesis, or similar). Operations requires consumer group management, partition assignment, dead-letter handling, and lag monitoring.

Required maturity: platform_engineering_team

Minimum team maturity: Experienced Backend Team

Both

This scenario has high operational complexity. It is recommended for Experienced Backend Team teams or higher.

Required maturity: experienced_backend_team

PostgreSQL: scenario includes high_write_throughput or write_heavy workload

Both

Deploy PgBouncer in transaction-mode pooling before relying on vertical scaling

Required maturity: mid_level

Runbooks and alerting for high-severity risks

Both

3 high-severity risks identified. Each requires a documented runbook, alerting threshold, and on-call response procedure before running in production.

Replica lag monitoring and lag-aware routing

Left

Read replicas must be monitored for replication lag. The application router must include a max_lag_ms threshold; queries above that threshold must be redirected to the primary.

Apache Cassandra: scenario has team_maturity below staff_plus

Right

Cassandra has the highest operational complexity of common datastores: consider managed options (Astra DB, Keyspaces) or simpler alternatives

Required maturity: staff_plus

Apache Cassandra: scenario has time_series or iot_telemetry workload

Right

Design partition keys with time-bucketing (e.g., date prefix) to prevent wide partitions as data grows

Required maturity: staff_plus

Apache Cassandra: scenario requires ad-hoc queries or analytics

Right

Cassandra cannot efficiently query non-partition-key dimensions: pair with Elasticsearch or ClickHouse for analytics

Required maturity: staff_plus

Cache sizing and eviction policy configuration

Right

Redis or equivalent cache requires correct maxmemory configuration, eviction policy selection (allkeys-lru is common), and cold-start warming strategy after restarts.

MinIO: scenario enables versioning without lifecycle expiration policies

Right

Configure ILM lifecycle policies with expiration rules for versioned objects; without expiration, version accumulation on high-churn objects consumes storage unboundedly

Required maturity: mid_level

MinIO: scenario stores large numbers of small objects (< 100KB average size)

Right

MinIO's per-request overhead reduces effective throughput for small objects; evaluate aggregating small objects into larger archives or using a key-value store for small object access patterns

Required maturity: mid_level

Redis: scenario has read_heavy workload with high cache miss risk

Right

Implement cache stampede protection (probabilistic early expiry or locking) to prevent thundering herd on cold start

Required maturity: junior

Redis: scenario relies on Redis for data that cannot be re-derived

Right

Redis is not a durable store: add persistence layer or treat Redis as expendable cache only

Required maturity: junior

Generator Constraints

Write-Heavy Transactional Platform

Left

Generator relevance documented but not yet production-ready.

For write-heavy product briefs requiring ACID guarantees and event durability, the generator should propose the PostgreSQL + outbox + WAL CDC + Kafka composition as the canonical starting point. Dual-write (synchronous DB + Kafka publish) must be listed as an anti-pattern with explicit consistency hazard documentation. PgBouncer must be included by default: not as an optional enhancement.

Streaming Media Platform

Right

Generator relevance documented but not yet production-ready.

For content platform briefs with video or audio delivery requirements, the generator should output the Kafka async transcoding pipeline, MinIO object storage, and CDN-first delivery as the canonical composition. Redis playback session with TTL enforcement and Cassandra for time-ordered viewing history should be generated as separate store responsibilities. The generator must flag the partition key design decision for the Cassandra history table as a mandatory architecture decision requiring explicit access pattern enumeration before schema creation.

Supporting Evidence

TypeReferenceExplanation
Comparisoncompare_write_heavy_transactional_platform_vs_streaming_media_platformFull comparison of Write-Heavy Transactional Platform vs Streaming Media Platform: 6 dimensions, 3 shared components, 0 shared risks.
Advisoradvisor_write_heavy_transactional_platformAdvisor for Write-Heavy Transactional Platform: 2 strengths, 4 risks, maturity: advanced.
Advisoradvisor_streaming_media_platformAdvisor for Streaming Media Platform: 0 strengths, 6 risks, maturity: advanced.
Scenariowrite_heavy_transactional_platformScenario 'Write-Heavy Transactional Platform': 4 scaling thresholds, 3 migration paths, complexity: high.
Scenariostreaming_media_platformScenario 'Streaming Media Platform': 4 scaling thresholds, 3 migration paths, complexity: high.
Risk Pathprop_workload_profile_write_heavy_transactional_risk_wal_saturationWrite-Heavy Transactional → WAL Saturation
Risk Pathprop_workload_profile_write_heavy_transactional_risk_lock_contentionWrite-Heavy Transactional → Lock Contention
Risk Pathprop_workload_profile_event_streaming_workload_risk_queue_backlog_accumulationEvent Streaming → Queue Backlog Accumulation. also affects: Slow Consumer
Risk Pathprop_technology_profile_redis_risk_thundering_herdRedis → Thundering Herd (Cache Stampede)
Risk Pathprop_workload_profile_write_heavy_transactional_risk_wal_saturationReferenced by the operational risk comparison dimension.
Risk Pathprop_workload_profile_write_heavy_transactional_risk_lock_contentionReferenced by the operational risk comparison dimension.

Limitations

  • ·Decision guidance is grounded in YAML knowledge only. Not measured from any production system.
  • ·Recommendations are deterministic heuristics based on structured knowledge. Your specific workload, team profile, and business context may lead to different conclusions.
  • ·Generator constraints are preliminary. No scenario should be treated as production generation-ready at this stage.

Comparison complete

Profile, topology, simulation, advisor, comparison, and decision path are ready. Your architecture decision is grounded in structured knowledge and deterministic reasoning.