Add .NET 11.0 upgrade plan, assessment, and risk docs
Added a detailed .NET 11.0 (PREVIEW) upgrade plan (plan.md) outlining a bottom-up migration strategy, dependency analysis, risk management, testing, and success criteria for the Jellyfin solution. Introduced assessment.md, assessment.json, and assessment.csv with comprehensive compatibility analysis for all 41 projects, confirming no blocking issues. Added Risk Management Strategies.md detailing mitigation and rollback procedures. Also included scenario.json describing the upgrade scenario and selected strategy. No existing files were changed.
This commit is contained in:
@@ -0,0 +1,393 @@
|
||||
# Risk Management Strategies for .NET 11.0 Preview Migration
|
||||
|
||||
Based on the comprehensive plan I created, here's a detailed explanation of the risk management strategies:
|
||||
|
||||
---
|
||||
|
||||
## 🎯 Overall Risk Philosophy
|
||||
|
||||
The migration employs a **defense-in-depth** approach with **three layers of protection**:
|
||||
|
||||
1. **Preventive Controls** - Stop problems before they occur (bottom-up strategy, tier ordering)
|
||||
2. **Detective Controls** - Identify problems early (extensive testing at each tier)
|
||||
3. **Corrective Controls** - Fix or rollback when problems occur (contingency plans, git rollback)
|
||||
|
||||
---
|
||||
|
||||
## 📊 Risk Classification System
|
||||
|
||||
### Four-Tier Risk Model
|
||||
|
||||
| Risk Level | Impact Scope | Mitigation Priority | Example |
|
||||
|------------|--------------|---------------------|---------|
|
||||
| **CRITICAL** | Entire solution | Highest | .NET 11.0 preview instability, Database providers |
|
||||
| **HIGH** | Multiple projects | High | SkiaSharp native interop, Main application |
|
||||
| **MEDIUM** | Single/few projects | Medium | API compatibility, Networking |
|
||||
| **LOW** | Limited scope | Standard | Test projects, Utility libraries |
|
||||
|
||||
---
|
||||
|
||||
## 🚨 Critical Risk Management
|
||||
|
||||
### Risk #1: .NET 11.0 Preview Framework Instability
|
||||
|
||||
**Why Critical**: Affects entire solution; preview = not production-ready
|
||||
|
||||
**Mitigation Strategies**:
|
||||
|
||||
1. **Early Detection** (Bottom-Up Strategy)
|
||||
- Tier 2 is the **canary tier** - first to use .NET 11.0
|
||||
- Issues discovered in Tier 2 affect only 3 projects, not 40
|
||||
- Can assess viability before committing entire solution
|
||||
|
||||
2. **Progressive Exposure**
|
||||
- Each tier tests more functionality
|
||||
- Build confidence incrementally
|
||||
- Learn .NET 11.0 behavior patterns early
|
||||
|
||||
3. **Pause Points**
|
||||
- After Tier 2: Assess preview framework stability
|
||||
- After Tier 6: Database providers validated (critical milestone)
|
||||
- After Tier 11: Application functional
|
||||
|
||||
4. **Rollback Capability**
|
||||
- Git branch isolation (`upgrade-to-NET11`)
|
||||
- Can revert entire migration with single git operation
|
||||
- Alternative target ready (.NET 10.0 LTS)
|
||||
|
||||
5. **Monitoring**
|
||||
- Track .NET 11.0 preview announcements
|
||||
- Monitor GitHub issues for known problems
|
||||
- Stay connected with .NET community
|
||||
|
||||
**Decision Triggers**:
|
||||
- ✅ **Continue** if Tier 2 succeeds with acceptable issues
|
||||
- ⚠️ **Pause** if critical bugs discovered
|
||||
- 🛑 **Abort** if blocking issues with no workaround
|
||||
|
||||
---
|
||||
|
||||
### Risk #2: Database Provider Compatibility (Tier 6)
|
||||
|
||||
**Why Critical**: All data access depends on these; application unusable if broken
|
||||
|
||||
**Mitigation Strategies**:
|
||||
|
||||
1. **Dedicated Tier** (Tier 6)
|
||||
- Isolated focus on database providers only
|
||||
- No mixing with other concerns
|
||||
- Full attention on validation
|
||||
|
||||
2. **Extensive Testing Regime**
|
||||
```
|
||||
✓ Connection tests (pooling, SSL, timeouts)
|
||||
✓ Migration tests (existing migrations, upgrades)
|
||||
✓ CRUD tests (all operations)
|
||||
✓ Query translation tests (LINQ to SQL)
|
||||
✓ Transaction tests (commit, rollback)
|
||||
✓ Performance tests (baseline comparison)
|
||||
✓ Concurrency tests (locking, isolation)
|
||||
✓ Edge case tests (nulls, large datasets, errors)
|
||||
```
|
||||
|
||||
3. **Dual Provider Validation**
|
||||
- Test both PostgreSQL AND SQLite
|
||||
- Ensure both work independently
|
||||
- Validate switching between providers
|
||||
- Real-world scenario testing
|
||||
|
||||
4. **Performance Baseline**
|
||||
- Document .NET 9.0 query performance
|
||||
- Compare .NET 11.0 against baseline
|
||||
- Acceptable: <10% regression
|
||||
- Red flag: >20% regression (investigate or pause)
|
||||
|
||||
5. **GO/NO-GO Decision Point**
|
||||
- **Tier 6 is the primary gate**
|
||||
- Must pass ALL criteria before proceeding
|
||||
- If fails: entire migration may pause
|
||||
- Options:
|
||||
- Report to Npgsql/EF Core teams
|
||||
- Wait for provider fixes
|
||||
- Implement workarounds (if feasible)
|
||||
- Switch to .NET 10.0 LTS
|
||||
|
||||
**Why This Works**:
|
||||
- Catches database issues before 90% of codebase migrated
|
||||
- Business logic (Tiers 8+) depends on stable database layer
|
||||
- Prevents cascading failures up the stack
|
||||
|
||||
---
|
||||
|
||||
## 🎯 High Risk Management
|
||||
|
||||
### Risk #3: Media Processing (SkiaSharp) - Tier 8
|
||||
|
||||
**Challenge**: Native library interop may break with .NET 11.0
|
||||
|
||||
**Mitigation**:
|
||||
|
||||
1. **Native Library Verification**
|
||||
- Test library loading explicitly
|
||||
- Verify cross-platform compatibility (Linux primary)
|
||||
- Validate font rendering (HarfBuzz)
|
||||
|
||||
2. **Functional Testing**
|
||||
- Image processing workflows
|
||||
- Thumbnail generation
|
||||
- Format conversions
|
||||
|
||||
3. **Contingency**
|
||||
- Check for SkiaSharp .NET 11.0 updates
|
||||
- Report issues to SkiaSharp maintainers
|
||||
- May need to wait for library updates
|
||||
- Can isolate failure to drawing subsystem
|
||||
|
||||
### Risk #4: Main Application (Jellyfin.Server) - Tier 11
|
||||
|
||||
**Challenge**: Entry point where all features converge
|
||||
|
||||
**Mitigation**:
|
||||
|
||||
1. **Foundation First**
|
||||
- Tiers 2-10 stable before reaching application
|
||||
- Issues isolated to lower tiers
|
||||
- Less debugging needed at application level
|
||||
|
||||
2. **Comprehensive Smoke Testing**
|
||||
```
|
||||
✓ Application starts
|
||||
✓ Web UI loads
|
||||
✓ Authentication works
|
||||
✓ Library browsing
|
||||
✓ Playback initiates
|
||||
✓ API responds
|
||||
```
|
||||
|
||||
3. **Staged Validation**
|
||||
- Build validation first
|
||||
- Startup validation next
|
||||
- Feature validation last
|
||||
|
||||
---
|
||||
|
||||
## 🔄 The Bottom-Up Strategy as Risk Management
|
||||
|
||||
### Why Bottom-Up Reduces Risk
|
||||
|
||||
1. **Failure Blast Radius Control**
|
||||
```
|
||||
Tier 2 failure: Affects 3 projects only
|
||||
Tier 6 failure: Affects 6 projects (but caught before 90% of solution)
|
||||
Tier 11 failure: All lower tiers proven stable (easier debugging)
|
||||
|
||||
vs. Top-Down:
|
||||
Tier 11 failure first: 9 dependencies could be causing it (hard to debug)
|
||||
```
|
||||
|
||||
2. **Progressive Validation**
|
||||
- Each tier includes test projects
|
||||
- Lower tiers validated by higher tier tests
|
||||
- Cumulative confidence builds
|
||||
- **Test pyramid**:
|
||||
```
|
||||
Tier 13: Full integration tests (top)
|
||||
Tier 12: Integration tests
|
||||
Tier 9: API + business tests
|
||||
Tier 5: Model tests
|
||||
Tier 3: Component tests (bottom)
|
||||
```
|
||||
|
||||
3. **Incremental Learning**
|
||||
- Tier 2 teaches .NET 11.0 behavior
|
||||
- Lessons applied to Tiers 3-13
|
||||
- Pattern recognition for issues
|
||||
- Team builds expertise as they progress
|
||||
|
||||
4. **Flexible Rollback**
|
||||
- Can rollback at any tier
|
||||
- Only lose work from current tier
|
||||
- Not "all or nothing"
|
||||
|
||||
---
|
||||
|
||||
## 🛡️ Mitigation by Tier
|
||||
|
||||
### Tier Completion Criteria (Safety Gates)
|
||||
|
||||
Each tier must pass criteria before next tier starts:
|
||||
|
||||
| Criterion | Purpose | Risk Mitigated |
|
||||
|-----------|---------|----------------|
|
||||
| **Build Success** | No compilation errors | Breaking API changes |
|
||||
| **Zero Warnings** | Code quality maintained | Technical debt accumulation |
|
||||
| **100% Test Pass** | Functionality intact | Regression bugs |
|
||||
| **Package Health** | Dependencies resolved | Compatibility conflicts |
|
||||
| **Performance Check** | Speed acceptable | Performance degradation |
|
||||
| **Manual Review** | Human oversight | Subtle issues missed by automation |
|
||||
|
||||
**If ANY criterion fails**: Do not proceed. Fix or rollback tier.
|
||||
|
||||
---
|
||||
|
||||
## 📋 Rollback Strategy (Corrective Control)
|
||||
|
||||
### When to Rollback
|
||||
|
||||
**Automatic Triggers**:
|
||||
1. ❌ Tier 2-4 critical failures (preview framework issues)
|
||||
2. ❌ Tier 6 database provider failure (GO/NO-GO gate)
|
||||
3. ❌ >20% test failures in any tier
|
||||
4. ❌ >30% performance degradation
|
||||
5. ❌ Blocking preview bugs with no workaround
|
||||
6. ❌ Security vulnerabilities in preview framework
|
||||
|
||||
### How to Rollback
|
||||
|
||||
**Git-Based Rollback** (Fast & Clean):
|
||||
```sh
|
||||
# Option 1: Revert specific tier
|
||||
git revert <tier-commit-sha>
|
||||
|
||||
# Option 2: Reset entire migration
|
||||
git reset --hard <pre-migration-commit>
|
||||
|
||||
# Option 3: Switch to .NET 10.0 LTS
|
||||
git checkout -b upgrade-to-NET10
|
||||
# Adjust target framework to net10.0
|
||||
```
|
||||
|
||||
**Tier-Level Rollback**:
|
||||
- Revert only failed tier
|
||||
- Keep lower tiers on .NET 11.0
|
||||
- Analyze and fix issues
|
||||
- Retry tier
|
||||
|
||||
**Solution-Level Rollback**:
|
||||
- Complete revert to .NET 9.0
|
||||
- Document .NET 11.0 issues discovered
|
||||
- Switch to .NET 10.0 LTS (stable alternative)
|
||||
|
||||
---
|
||||
|
||||
## 📊 Risk Monitoring Dashboard
|
||||
|
||||
### Key Metrics to Track
|
||||
|
||||
| Metric | Baseline (.NET 9.0) | Threshold | Action if Exceeded |
|
||||
|--------|---------------------|-----------|---------------------|
|
||||
| **Build Errors** | 0 | 0 | Fix immediately |
|
||||
| **Test Pass Rate** | 100% | 100% | Fix immediately |
|
||||
| **Query Performance** | [Baseline] | +10% | Investigate |
|
||||
| **Startup Time** | [Baseline] | +20% | Profile & optimize |
|
||||
| **Memory Usage** | [Baseline] | +15% | Profile for leaks |
|
||||
| **API Response** | [Baseline] | +15% | Investigate |
|
||||
|
||||
### Continuous Monitoring
|
||||
|
||||
**Per-Tier**:
|
||||
- Build time
|
||||
- Test execution time
|
||||
- Package restore time
|
||||
- Compiler warnings count
|
||||
|
||||
**Application-Level** (Tier 11+):
|
||||
- Startup time
|
||||
- Memory consumption
|
||||
- API latency
|
||||
- Database query time
|
||||
|
||||
---
|
||||
|
||||
## 🎓 Risk Acceptance
|
||||
|
||||
### Accepted Risks
|
||||
|
||||
These risks are **knowingly accepted** due to preview framework requirement:
|
||||
|
||||
✅ **Minor preview instability** - Expected; can work around
|
||||
✅ **Performance variations** - Preview may be unoptimized; acceptable if <threshold
|
||||
✅ **Incomplete features** - Can defer feature usage or wait for release
|
||||
✅ **Breaking changes between previews** - Willing to adapt
|
||||
|
||||
### NOT Accepted
|
||||
|
||||
❌ **Critical runtime bugs** - Must rollback
|
||||
❌ **Data corruption** - Must rollback
|
||||
❌ **Security vulnerabilities** - Must rollback
|
||||
❌ **Showstopper bugs** - Must pause/rollback
|
||||
|
||||
---
|
||||
|
||||
## 🔍 Risk Communication
|
||||
|
||||
### Stakeholder Updates
|
||||
|
||||
**Frequency**: After each critical tier
|
||||
|
||||
**Tier 2**: "Preview framework assessment complete - [GO/NO-GO]"
|
||||
**Tier 6**: "Database providers validated - [GO/NO-GO]"
|
||||
**Tier 11**: "Application functional - [GO/NO-GO]"
|
||||
**Tier 13**: "Migration complete - ready for final review"
|
||||
|
||||
**Issue Documentation**:
|
||||
- All issues encountered logged
|
||||
- Workarounds documented
|
||||
- Performance metrics recorded
|
||||
- Lessons learned captured
|
||||
|
||||
---
|
||||
|
||||
## 💡 Key Risk Management Principles
|
||||
|
||||
### 1. **Fail Fast, Fail Small**
|
||||
- Tier 2 (3 projects) fails fast
|
||||
- Not Tier 11 (40 projects) failing late
|
||||
|
||||
### 2. **Test Everything, Trust Nothing**
|
||||
- 100% test pass rate required
|
||||
- Manual validation at critical points
|
||||
- Performance baselines enforced
|
||||
|
||||
### 3. **Reversibility**
|
||||
- Every change can be undone
|
||||
- Git history clean
|
||||
- Rollback procedures tested
|
||||
|
||||
### 4. **Progressive Commitment**
|
||||
- Tier-by-tier investment
|
||||
- Can pause at any tier
|
||||
- Not "all in" upfront
|
||||
|
||||
### 5. **Transparency**
|
||||
- All risks documented
|
||||
- All issues logged
|
||||
- All metrics tracked
|
||||
|
||||
---
|
||||
|
||||
## 📈 Success Factors
|
||||
|
||||
The risk management strategy succeeds because:
|
||||
|
||||
1. ✅ **Structural**: Bottom-up architecture naturally limits blast radius
|
||||
2. ✅ **Procedural**: Strict tier completion criteria prevent advancement with issues
|
||||
3. ✅ **Technical**: Comprehensive testing catches problems early
|
||||
4. ✅ **Organizational**: Clear decision points and rollback triggers
|
||||
5. ✅ **Cultural**: Accepting that rollback is success (prevented larger failure)
|
||||
|
||||
---
|
||||
|
||||
## 🎯 Summary
|
||||
|
||||
**This risk management strategy transforms a high-risk preview framework migration into a controlled, incremental process where:**
|
||||
|
||||
- Risks are identified and classified upfront
|
||||
- Critical risks get dedicated focus (Tier 6)
|
||||
- Issues discovered early (Tier 2 canary)
|
||||
- Progressive validation builds confidence
|
||||
- Rollback always available
|
||||
- Decision points clear
|
||||
- Success defined explicitly
|
||||
|
||||
**Result**: A **complex, high-risk migration** becomes **manageable through structured risk mitigation**.
|
||||
@@ -0,0 +1 @@
|
||||
Issue ID,Description,State,Severity,Story Points,Project Path,Location Kind,Path,Line,Column,Incident ID,Help Link,Assembly Name,Assembly Version,Assembly Public Key,Snippet
|
||||
|
File diff suppressed because it is too large
Load Diff
File diff suppressed because it is too large
Load Diff
File diff suppressed because it is too large
Load Diff
@@ -0,0 +1,13 @@
|
||||
{
|
||||
"scenarioId": "New-DotNet-Version",
|
||||
"operationId": "02bc6448-a69d-4ff4-a0ec-0db07ec3a09a",
|
||||
"description": "Upgrade solution or project to new version of .NET",
|
||||
"startTime": "2026-03-05T22:18:32.3921759Z",
|
||||
"lastUpdateTime": "2026-03-06T02:24:30.9349358Z",
|
||||
"stage": "Planning",
|
||||
"properties": {
|
||||
"SelectedScenarioStrategy": "BottomUp",
|
||||
"UpgradeTargetFramework": "net11.0"
|
||||
},
|
||||
"folderPath": ""
|
||||
}
|
||||
Reference in New Issue
Block a user