MEMO-070: Week 12 Days 2-3 - Technical Section Review for Engineers
Date: 2025-11-15 Updated: 2025-11-15 Author: Platform Team Related: MEMO-052, MEMO-069
Executive Summary
Goal: Evaluate technical content effectiveness for engineer audience (senior/staff/principal engineers)
Scope: Technical sections in RFC-057 through RFC-061
Findings:
- Average engineer effectiveness: 86/100 (B+ grade)
- Best: RFC-060 (100/100) - excellent code examples, algorithms, performance data
- Good: RFC-057 (95/100), RFC-059 (90/100), RFC-061 (85/100)
- Needs improvement: RFC-058 (60/100) - few algorithm sections, no benchmark section
Key Strengths:
- 271 code examples across all RFCs (avg 54 per RFC)
- 264 performance claims with quantitative data
- Strong Go code examples (86 total, 37% runnable)
- Comprehensive comparison tables
Recommendation: Minor improvements to RFC-058 (add benchmark section), all others excellent as-is
Methodology
Engineer Effectiveness Criteria
Code Examples (20 points):
- Quantity: 10+ code blocks minimum
- Quality: 30%+ with comments
- Runnability: 30%+ self-contained/runnable
Algorithm Explanations (20 points):
- Algorithm sections: 3+ step-by-step explanations
- Complexity analysis: Big-O notation for key operations
Performance Claims (30 points):
- Quantitative metrics: 5+ specific claims (e.g., "100× speedup")
- Benchmark section: Dedicated performance evaluation
- Comparison tables: Before/after or alternative comparisons
Trade-off Analysis (30 points):
- Trade-off discussions: 3+ explicit trade-off analyses
- Design rationale: Explanation of why decisions were made
Scoring Algorithm
score = 100
# Code examples (20 points)
if code_blocks < 10: score -= 10
if commented < 30%: score -= 5
if runnable < 30%: score -= 5
# Algorithms (20 points)
if algo_sections < 3: score -= 10
if no_complexity: score -= 10
# Performance (30 points)
if perf_claims < 5: score -= 15
if no_benchmarks: score -= 10
if no_tables: score -= 5
# Trade-offs (30 points)
if tradeoff_discussions < 3: score -= 15
if no_rationale: score -= 15
Analysis Tool
Created analyze_technical_sections.py (340 lines) to:
- Extract and analyze code blocks by language
- Identify algorithm explanations and complexity analysis
- Count performance claims and benchmarks
- Detect trade-off discussions
Findings
Overall Statistics
| Metric | Total | Per RFC | Assessment |
|---|---|---|---|
| Code blocks | 271 | 54.2 | ✅ Excellent |
| Performance claims | 264 | 52.8 | ✅ Excellent |
| Trade-off discussions | 18 | 3.6 | ✅ Good |
| Algorithm sections | 111 | 22.2 | ✅ Excellent |
Assessment: Strong technical depth across all dimensions
RFC-057: Massive-Scale Graph Sharding (Score: 95/100, Grade: A) ✅
Code Examples
| Metric | Value | Assessment |
|---|---|---|
| Total blocks | 57 | ✅ Excellent |
| Go code | 15 (26%) | ✅ Good |
| Protobuf | 4 (7%) | ✅ Good |
| With comments | 20 (35%) | ✅ Good |
| Runnable | 15 (26%) | ⚠️ Acceptable |
| Avg lines | 18.1 | ✅ Good |
Language Distribution:
- text: 26 (examples, output)
- go: 15 (implementation examples)
- yaml: 12 (configuration)
- protobuf: 4 (data models)
Sample Go Code (Opaque Vertex Router):
func (ovr *OpaqueVertexRouter) RouteVertex(vertexID string) (*PartitionLocation, error) {
// Three-tier lookup: cache → bloom filter → routing table
if location := ovr.cache.Get(vertexID); location != nil {
return location, nil
}
if !ovr.bloomFilter.Contains(vertexID) {
return nil, VertexNotFoundError{VertexID: vertexID}
}
location, err := ovr.routingTable.Get(vertexID)
if err != nil {
return nil, err
}
ovr.cache.Put(vertexID, location)
return location, nil
}
Assessment: ✅ Self-contained, commented, demonstrates three-tier lookup pattern
Algorithm Explanations
| Metric | Value | Assessment |
|---|---|---|
| Algorithm sections | 37 | ✅ Excellent |
| Complexity analysis | Yes (O(1), O(log n)) | ✅ Excellent |
Sample Algorithm (Hierarchical Vertex ID Routing):
Step 1: Parse vertex ID → extract cluster_id
Step 2: Lookup cluster → get proxy list
Step 3: Lookup proxy → get partition list
Step 4: Lookup partition → get vertex data
Complexity: O(1) for each step = O(1) overall
Assessment: ✅ Clear step-by-step breakdown with complexity analysis
Performance Claims
| Metric | Value | Assessment |
|---|---|---|
| Total claims | 43 | ✅ Excellent |
| Has benchmarks | Yes | ✅ Excellent |
| Comparison tables | Yes (5 tables) | ✅ Excellent |
Sample Claims:
- "180× faster" (partition rebalancing: hierarchical vs opaque IDs)
- "7× faster" (cross-AZ query optimization)
- "10 ns" (vertex ID parsing latency)
Benchmark Section: "Performance Characteristics" with detailed comparison tables
Trade-off Analysis
| Metric | Value | Assessment |
|---|---|---|
| Trade-off discussions | 5 | ✅ Excellent |
| Design rationale | Yes | ✅ Excellent |
Sample Trade-off (Hierarchical vs Opaque Vertex IDs):
Trade-off: Routing Speed vs Rebalancing Flexibility
Hierarchical IDs:
Pros: Zero-overhead routing (10 ns parse)
Cons: Expensive rebalancing (30 min per partition)
Opaque IDs:
Pros: Fast rebalancing (10 sec per partition)
Cons: Routing overhead (150 μs lookup)
Recommendation: Hybrid approach - hierarchical by default,
opaque for hot partitions
Assessment: ✅ Clear pros/cons with concrete metrics and recommendation
Overall Assessment
Strengths:
- ✅ 57 code examples (most of any RFC)
- ✅ 37 algorithm sections (comprehensive)
- ✅ 43 performance claims (data-driven)
- ✅ 5 explicit trade-off discussions
Minor Weaknesses:
- ⚠️ Only 26% of code examples are runnable (could be higher)
Recommendation: ✅ Excellent as-is (minor: add more runnable examples in future updates)
RFC-058: Multi-Level Graph Indexing (Score: 60/100, Grade: D) ⚠️
Code Examples
| Metric | Value | Assessment |
|---|---|---|
| Total blocks | 46 | ✅ Good |
| Go code | 10 (22%) | ✅ Good |
| With comments | 15 (33%) | ✅ Good |
| Runnable | 10 (22%) | ⚠️ Low |
| Avg lines | 19.8 | ✅ Good |
Assessment: ✅ Sufficient code examples, reasonable quality
Algorithm Explanations
| Metric | Value | Assessment |
|---|---|---|
| Algorithm sections | 1 | ❌ Very low |
| Complexity analysis | Yes (O(log n)) | ✅ Good |
Issue: Only 1 algorithm section despite RFC focusing on indexing algorithms
Missing:
- Index construction algorithm
- Index update algorithm (incremental)
- Bloom filter cascade algorithm
- Index selection algorithm (query optimization)
Recommendation: ⚠️ Add 3-4 algorithm sections explaining:
- Four-tier index construction
- Incremental index updates via WAL
- Bloom filter cascade operation
- Index selection during query planning
Performance Claims
| Metric | Value | Assessment |
|---|---|---|
| Total claims | 69 | ✅ Excellent |
| Has benchmarks | No | ❌ Missing |
| Comparison tables | Yes | ✅ Good |
Issue: 69 performance claims but no dedicated "Performance Characteristics" section
Sample Claims:
- "20,000× speedup" (indexed vs unindexed property scan)
- "3× faster" (edge index vs adjacency list)
- "10× faster" (bloom filter cascade)
Recommendation: ⚠️ Add "Performance Characteristics" section with:
- Benchmark methodology
- Index construction time
- Query latency with/without indexes
- Index memory overhead
Trade-off Analysis
| Metric | Value | Assessment |
|---|---|---|
| Trade-off discussions | 5 | ✅ Excellent |
| Design rationale | No | ❌ Missing |
Assessment: Trade-offs discussed but no "Rationale" section
Recommendation: ⚠️ Add "Design Rationale" section explaining:
- Why four-tier hierarchy (not three or five)
- Why bloom filters (not skip lists or other alternatives)
- Why online index building (vs offline batch)