Resource Leak Prevention System - Architecture Diagrams
Resource Leak Prevention System - Architecture Diagrams
1. Connection Pool Lifecycle with Leak Detection
stateDiagram-v2 [*] --> Idle: Create Idle --> Active: Acquire Active --> Idle: Release (normal) Active --> Warning: Held > 10min Warning --> Leaked: Held > 30min Leaked --> Reclaimed: Force reclaim Idle --> HealthCheck: Periodic check HealthCheck --> Idle: Healthy HealthCheck --> Closed: Unhealthy Active --> Closed: Max lifetime exceeded Idle --> Closed: Idle timeout Reclaimed --> Closed: Cleanup Closed --> [*]
note right of Warning Alert sent to operator Stack trace captured Monitoring increased end note
note right of Leaked Force reclamation triggered Critical alert sent Connection terminated end note2. Timeout Framework Architecture
graph TB subgraph "Application Layer" A[Query Execution] B[File I/O] C[Network Operations] D[Lock Acquisition] end
subgraph "Timeout Framework" E[TimeoutEnforcer] F[TimeoutContext] G[CancellationManager] H[TimeoutRegistry] end
subgraph "Timeout Types" I[Query Timeout: 30s] J[I/O Timeout: 10s] K[Network Timeout: 5s] L[Lock Timeout: 1s] end
A --> E B --> E C --> E D --> E
E --> F E --> G E --> H
F --> I F --> J F --> K F --> L
G --> M[Tokio Runtime] H --> N[Metrics]
style E fill:#f9f,stroke:#333,stroke-width:4px style F fill:#bbf,stroke:#333,stroke-width:2px3. Resource Pressure Detection & Response
flowchart TD A[Monitor Resources] --> B{Detect Pressure}
B -->|< 70%| C[Normal Mode] B -->|70-85%| D[Elevated Pressure] B -->|85-95%| E[High Pressure] B -->|> 95%| F[Critical Pressure]
C --> G[No Action]
D --> H[Close Idle Connections] D --> I[Disable Analytics]
E --> J[Reduce Connection Pool] E --> K[Limit Query Concurrency] E --> L[Disable Background Tasks] E --> M[Force GC]
F --> N[Reject New Connections] F --> O[Reject Complex Queries] F --> P[Read-Only Mode] F --> Q[Emergency Cleanup]
H --> R[Monitor for Relief] I --> R J --> R K --> R L --> R M --> R N --> R O --> R P --> R Q --> R
R --> S{Pressure Reduced?} S -->|Yes| T[Restore Normal Operations] S -->|No| U[Escalate Alerts]
T --> A U --> V[Manual Intervention]
style F fill:#f00,stroke:#333,stroke-width:4px,color:#fff style E fill:#fa0,stroke:#333,stroke-width:2px style D fill:#ff0,stroke:#333,stroke-width:2px4. Connection Pool with Circuit Breaker
sequenceDiagram participant Client participant Pool as Connection Pool participant CB as Circuit Breaker participant Backend
Client->>Pool: acquire() Pool->>CB: check state
alt Circuit Closed CB-->>Pool: allow Pool->>Backend: create/get connection Backend-->>Pool: connection Pool-->>Client: connection Client->>Pool: release() Pool->>CB: on_success() else Circuit Open CB-->>Pool: reject Pool-->>Client: Error: Circuit Open end
Note over CB: After timeout period CB->>CB: transition to Half-Open
Client->>Pool: acquire() Pool->>CB: check state CB-->>Pool: allow (limited) Pool->>Backend: test connection
alt Success Backend-->>Pool: connection Pool->>CB: on_success() CB->>CB: transition to Closed else Failure Backend-->>Pool: error Pool->>CB: on_failure() CB->>CB: re-open circuit end5. Query Resource Tracking Lifecycle
flowchart LR A[Query Start] --> B[Create QueryResources] B --> C[Allocate Memory] C --> D{Within Limit?} D -->|No| E[Reject] D -->|Yes| F[Track Allocation]
F --> G[Open Files] G --> H{Within Limit?} H -->|No| I[Release Memory & Reject] H -->|Yes| J[Track Files]
J --> K[Execute Query] K --> L[Query Complete/Error/Timeout]
L --> M[Release Memory] M --> N[Close Files] N --> O[Release Locks] O --> P[Update Metrics] P --> Q[Remove Tracker]
E --> R[Error to Client] I --> R
style D fill:#bbf,stroke:#333,stroke-width:2px style H fill:#bbf,stroke:#333,stroke-width:2px style M fill:#bfb,stroke:#333,stroke-width:2px style N fill:#bfb,stroke:#333,stroke-width:2px style O fill:#bfb,stroke:#333,stroke-width:2px6. Graceful Degradation Decision Tree
graph TD A[Detect Resource Pressure] --> B{Memory Pressure?} B -->|High| C[Force GC] B -->|Critical| D[Reduce Memory Limits]
A --> E{Connection Pressure?} E -->|High| F[Close Idle Connections] E -->|Critical| G[Reject New Connections]
A --> H{CPU Pressure?} H -->|High| I[Limit Query Concurrency] H -->|Critical| J[Read-Only Mode]
A --> K{File Descriptor Pressure?} K -->|High| L[Close Unused Files] K -->|Critical| M[Reject File Operations]
C --> N[Monitor] D --> N F --> N G --> N I --> N J --> N L --> N M --> N
N --> O{Pressure Relieved?} O -->|Yes| P[Restore Normal Mode] O -->|No| Q[Maintain Degradation]
P --> A Q --> R[Continue Monitoring] R --> O
style D fill:#f00,color:#fff style G fill:#f00,color:#fff style J fill:#f00,color:#fff style M fill:#f00,color:#fff7. Backpressure Queue Management
flowchart TB A[New Request] --> B{Check Pressure}
B -->|Normal| C[Process Immediately]
B -->|Elevated| D{Priority?} D -->|High/Critical| C D -->|Low/Medium| E[Queue Request]
B -->|High| F{Priority?} F -->|Critical| C F -->|Other| E
B -->|Critical| G{Priority?} G -->|Critical| C G -->|Other| H[Reject]
E --> I{Queue Full?} I -->|Yes| J[Evict Lowest Priority] I -->|No| K[Add to Queue]
J --> K K --> L[Wait for Slot]
L --> M{Timeout?} M -->|Yes| N[Return Timeout Error] M -->|No| O{Pressure Reduced?}
O -->|Yes| P[Process Request] O -->|No| L
C --> Q[Execute] P --> Q H --> R[Return Error] N --> R
style H fill:#f00,color:#fff style N fill:#fa0 style C fill:#bfb8. Resource Leak Detection Flow
sequenceDiagram participant Pool as Connection Pool participant Detector as Leak Detector participant Monitor as Background Monitor participant Alert as Alert Manager
Pool->>Detector: track_acquisition(conn_id, context) Note over Detector: Start tracking<br/>Capture stack trace
loop Every 1 minute Monitor->>Detector: scan_for_leaks() Detector->>Detector: check all tracked connections
alt Connection held > 10min Detector->>Alert: send_warning(conn_id, duration) Note over Alert: Warning alert sent end
alt Connection held > 30min Detector->>Alert: send_critical_leak(conn_id, duration) Detector->>Pool: force_reclaim(conn_id) Pool->>Pool: close connection forcefully Pool->>Detector: track_release(conn_id) Note over Alert: Critical alert sent end end
Pool->>Detector: track_release(conn_id) Note over Detector: Stop tracking<br/>Connection released normally9. Comprehensive Resource Management System
┌────────────────────────────────────────────────────────────────────┐│ Client Requests │└────────────────┬───────────────────────────────────────────────────┘ │ ▼┌────────────────────────────────────────────────────────────────────┐│ Backpressure Manager ││ ┌──────────────┐ ┌──────────────┐ ┌──────────────┐ ││ │ Priority │ │ Queue │ │ Pressure │ ││ │ Evaluation │ │ Management │ │ Detection │ ││ └──────────────┘ └──────────────┘ └──────────────┘ │└────────────────┬───────────────────────────────────────────────────┘ │ ▼┌────────────────────────────────────────────────────────────────────┐│ Circuit Breaker Layer ││ ┌──────────────┐ ┌──────────────┐ ┌──────────────┐ ││ │ State: │ │ Failure │ │ Recovery │ ││ │ Closed/Open/ │ │ Threshold │ │ Logic │ ││ │ Half-Open │ │ Detection │ │ │ ││ └──────────────┘ └──────────────┘ └──────────────┘ │└────────────────┬───────────────────────────────────────────────────┘ │ ▼┌────────────────────────────────────────────────────────────────────┐│ Connection Pool Manager ││ ┌──────────────┐ ┌──────────────┐ ┌──────────────┐ ││ │ Leak │ │ Health │ │ Lifecycle │ ││ │ Detector │ │ Monitor │ │ Manager │ ││ └──────────────┘ └──────────────┘ └──────────────┘ ││ ││ ┌──────────────┐ ┌──────────────┐ ┌──────────────┐ ││ │ Idle Queue │ │ Active │ │ Cleanup │ ││ │ │ │ Connections │ │ Scheduler │ ││ └──────────────┘ └──────────────┘ └──────────────┘ │└────────────────┬───────────────────────────────────────────────────┘ │ ▼┌────────────────────────────────────────────────────────────────────┐│ Timeout Enforcement Layer ││ ┌──────────────┐ ┌──────────────┐ ┌──────────────┐ ││ │ Timeout │ │ Cancellation │ │ Timeout │ ││ │ Context │ │ Manager │ │ Registry │ ││ └──────────────┘ └──────────────┘ └──────────────┘ │└────────────────┬───────────────────────────────────────────────────┘ │ ▼┌────────────────────────────────────────────────────────────────────┐│ Resource Limit Enforcement ││ ┌──────────────┐ ┌──────────────┐ ┌──────────────┐ ││ │ Query │ │ User │ │ Global │ ││ │ Tracker │ │ Tracker │ │ Limits │ ││ └──────────────┘ └──────────────┘ └──────────────┘ ││ ││ ┌──────────────┐ ┌──────────────┐ ┌──────────────┐ ││ │ Memory │ │ File │ │ Thread │ ││ │ Enforcement │ │ Enforcement │ │ Enforcement │ ││ └──────────────┘ └──────────────┘ └──────────────┘ │└────────────────┬───────────────────────────────────────────────────┘ │ ▼┌────────────────────────────────────────────────────────────────────┐│ Graceful Degradation Manager ││ ┌──────────────┐ ┌──────────────┐ ┌──────────────┐ ││ │ Degradation │ │ Strategy │ │ Recovery │ ││ │ Detection │ │ Selection │ │ Coordinator │ ││ └──────────────┘ └──────────────┘ └──────────────┘ │└────────────────┬───────────────────────────────────────────────────┘ │ ▼┌────────────────────────────────────────────────────────────────────┐│ Monitoring & Alerting ││ ┌──────────────┐ ┌──────────────┐ ┌──────────────┐ ││ │ Metrics │ │ Alert │ │ Dashboard │ ││ │ Collector │ │ Manager │ │ Integration │ ││ └──────────────┘ └──────────────┘ └──────────────┘ │└────────────────────────────────────────────────────────────────────┘10. Timeline: Connection Lifecycle with Leak Detection
Time: 0s 10m 30m 1h 2h 4h │ │ │ │ │ │ │ │ │ │ │ │Acquire ──┤ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │Normal ───┼──────────┤ │ │ │ │Use │ Normal │ │ │ │ │ │ Range │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │Warning ──┼──────────┼──────────┤ │ │ │ │ │ Warning │ │ │ │ │ │ Alert │ │ │ │ │ │ Sent │ │ │ │ │ │ │ │ │ │Leak ─────┼──────────┼──────────┼──────────┤ │ │Detected │ │ │ Critical│ │ │ │ │ │ Alert & │ │ │ │ │ │ Force │ │ │ │ │ │ Reclaim │ │ │ │ │ │ │ │ │Max Age ──┼──────────┼──────────┼──────────┼──────────┤ │(Soft) │ │ │ │ Soft │ │ │ │ │ │ Recycle │ │ │ │ │ │ │ │ │ │ │ │ │ │Max ──────┼──────────┼──────────┼──────────┼──────────┼──────────┤Lifetime │ │ │ │ │ Force │(Hard) │ │ │ │ │ Close │ │ │ │ │ │ │
Legend: Normal Use: Expected operation range Warning: Potential leak, alert sent Leak Detected: Confirmed leak, force reclamation Max Age (Soft): Prefer recycling at this point Max Lifetime (Hard): Mandatory closureLast Updated: 2025-11-10 Version: 1.0