foxhunt/WAVE_2_AGENT_18_QUICK_REFERENCE.md

Wave 2 Agent 18: Stress Tests Quick Reference

Status: ✅ COMPLETE (14/14 chaos scenarios operational) Date: 2025-10-15

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Quick Start

Run All Chaos Tests

cargo test -p stress_tests --test chaos_testing

Run Specific Test

cargo test -p stress_tests --test chaos_testing test_database_connection_pool_exhaustion

Run with Logging

RUST_LOG=info cargo test -p stress_tests --test chaos_testing -- --nocapture

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What Was Fixed

1. Critical Bug: Infinite Recovery Loop

Location: services/stress_tests/tests/chaos_testing.rs:570

Issue: test_graceful_degradation had infinite loop with no retry limit, causing all tests to hang.

Fix: Added retry counter with 100-attempt limit (10 seconds).

2. Added 3 New Chaos Scenarios

1. Database Connection Pool Exhaustion - Line 793

   • 100 concurrent queries stress test
   • Validates graceful degradation

2. Redis Connection Pool Exhaustion - Line 878

   • 50 concurrent Redis operations
   • Pool stress validation

3. Redis Cache Failure Cascade - Line 980

   • 3-stage cascade: cache failure → memory pressure → DB load
   • Circuit breaker validation

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Test Suite (14 Scenarios)

Core Chaos (9)

#	Test	Duration	Focus
1	Database Connection Loss	5s	Connection retry
2	Redis Cache Failure	3s	Degraded mode
3	Network Partition	5s	Circuit breaker
4	Memory Pressure	3s	Resource limits
5	Cascade Failure	8s	Multi-service
6	DB Pool Exhaustion ⭐	15s	Pool saturation
7	Redis Pool Exhaustion ⭐	10s	Connection stress
8	Redis Cache Cascade ⭐	10s	Redis cascade
9	Data Consistency	5s	ACID properties

Extended Chaos (5)

#	Test	Duration	Focus
10	Uptime SLA Compliance	60s	All scenarios
11	Circuit Breaker Behavior	8s	CB activation
12	Graceful Degradation	12s	Degraded mode
13	Full Resource Exhaustion	15s	Multi-resource
14	Extreme Network Latency	20s	Extreme conditions

⭐ = New in Wave 2 Agent 18

Total Duration: ~3 minutes (serial execution)

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Files Modified

1. services/stress_tests/tests/chaos_testing.rs

   • Fixed infinite loop (line 569-591)
   • Added 3 new scenarios (+280 lines)
   • Total: 1,063 lines (was 783)

2. CLAUDE.md

   • Updated stress test status: 6/9 → 14/14
   • Marked stress testing as complete

3. Created:

   • WAVE_2_AGENT_18_STRESS_TESTS.md (comprehensive doc)
   • WAVE_2_AGENT_18_QUICK_REFERENCE.md (this file)

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Key Improvements

Timeout Handling

Before:

loop {  // ❌ INFINITE
    // recovery logic
}

After:

let max_retries = 100;
let mut attempts = 0;

loop {
    attempts += 1;
    if attempts > max_retries {
        return Err(anyhow::anyhow!("Max retry attempts exceeded"));
    }
    // recovery logic
}

Resource Cleanup

All new tests cleanup Redis keys and DB transactions:

// Cleanup stress test keys
for i in 0..70 {
    let key = format!("stress_test_key_{}", i);
    redis::cmd("DEL").arg(&key).query_async::<()>(&mut con).await.ok();
}

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Infrastructure Requirements

Required:

• PostgreSQL: localhost:5432
• Redis: localhost:6379

Verify:

docker-compose ps

Start:

docker-compose up -d postgres redis

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Expected Results

All Tests Should

• ✅ Detect failures within 1 second
• ✅ Recover within 30 seconds
• ✅ Maintain data consistency
• ✅ Activate circuit breakers when appropriate
• ✅ Demonstrate graceful degradation
• ✅ Cleanup all test artifacts

Success Rate

• Target: 100% (14/14 tests passing)
• With Infrastructure: 14/14
• Without Infrastructure: Tests skip gracefully (warnings, not failures)

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Troubleshooting

Tests Hang/Timeout

Issue: Infinite recovery loop (FIXED in Agent 18)

Verification: Check line 570 in chaos_testing.rs has retry limit.

Infrastructure Not Available

Symptom: Tests skip with warnings

Solution: Start Docker services:

docker-compose up -d postgres redis

Tests Fail

Check:

1. Docker services healthy: docker-compose ps
2. No port conflicts: lsof -i :5432 and lsof -i :6379
3. Test logs: RUST_LOG=debug cargo test ... -- --nocapture

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Performance

Test Execution

• Duration: ~3 minutes (all 14 tests)
• Parallelism: Serial (#[serial] attribute)
• Timeout: 30 seconds per test (RECOVERY_TIMEOUT)

Resource Usage

• Memory: ~500MB (Redis stress tests)
• CPU: Variable (CPU saturation tests)
• Network: Minimal (local Docker)

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Next Steps

Completed ✅:

• All chaos scenarios implemented
• Infinite loop bug fixed
• Documentation complete

Optional:

1. Integrate with CI/CD pipeline
2. Add Prometheus metrics
3. Production chaos engineering

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Related Documentation

• WAVE_2_AGENT_18_STRESS_TESTS.md: Comprehensive implementation details
• services/stress_tests/src/fault_injector.rs: Fault injection utilities
• services/stress_tests/src/metrics.rs: Metrics collection
• CLAUDE.md: Project status and roadmap

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Agent 18 - Quick Reference ✅ Last Updated: 2025-10-15 Status: ALL CHAOS SCENARIOS OPERATIONAL (14/14)