Enable Discovery debug logging for production troubleshooting
- Add DISCOVERY_LOG_LEVEL=debug - Add DISCOVERY_SHOW_PROGRESS=true - Temporary changes for debugging InitializerProcessor fixes on production
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# Master/Slave Router with Load Balancing
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Der Master/Slave Router bietet fortgeschrittene Load Balancing und Monitoring Funktionen für optimale Database-Performance in High-Availability Setups.
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## ✅ Implemented Features
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### Weighted Selection Algorithm
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- **Dynamic Weight Adjustment**: Gewichte basierend auf aktueller Connection-Last und Response Time
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- **Load Factor**: Reduziert Gewichtung bei hoher Connection-Auslastung (min. 10% Gewichtung)
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- **Response Time Factor**: Bevorzugt schnelle Replicas basierend auf Moving Average
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- **Minimum Weight Protection**: Alle Replicas behalten mindestens 1% Gewichtung
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### Connection Metrics & Monitoring
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- **Real-time Connection Counting**: Tracking aktiver Connections pro Replica
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- **Response Time History**: Moving Average der letzten 100 Response Times pro Replica
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- **Health Monitoring**: Automatische Health Checks mit konfigurierbaren Intervallen
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- **Comprehensive Statistics**: Detaillierte Routing-Statistiken für Monitoring
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### Load Balancing Strategies
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- **WEIGHTED**: Intelligente gewichtete Auswahl mit Performance-Adjustierung
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- **LEAST_CONNECTIONS**: Auswahl der Replica mit wenigsten aktiven Connections
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- **RESPONSE_TIME**: Auswahl basierend auf bester durchschnittlicher Response Time
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- **ROUND_ROBIN**: Traditionelle zyklische Auswahl
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- **RANDOM**: Zufällige Auswahl für gleichmäßige Verteilung
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## Configuration
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### DriverConfig Extension
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```php
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public readonly class DriverConfig
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{
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public function __construct(
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// ... existing parameters ...
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public int $weight = 100, // Load balancing weight
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public int $maxConnections = 100 // Max concurrent connections
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) {}
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}
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```
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### ReadWriteConfig Methods
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```php
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$config->getConnectionWeight($index); // Get weight for replica
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$config->getMaxConnections($index); // Get max connections for replica
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$config->getAllWeights(); // Get all weights indexed by position
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```
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## Usage Examples
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### Weighted Load Balancing Setup
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```php
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$readWriteConfig = new ReadWriteConfig(
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enabled: true,
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readConnections: [
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DriverConfig::fromArray([
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'host' => 'replica1.db.local',
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'weight' => 100, // Normal weight
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'max_connections' => 50
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]),
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DriverConfig::fromArray([
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'host' => 'replica2.db.local',
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'weight' => 200, // 2x higher capacity
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'max_connections' => 100
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]),
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DriverConfig::fromArray([
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'host' => 'replica3.db.local',
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'weight' => 50, // Lower capacity
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'max_connections' => 25
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])
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],
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loadBalancingStrategy: LoadBalancingStrategy::WEIGHTED
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);
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```
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### Connection Tracking
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```php
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// Router tracks connections automatically
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$replica = $router->route($sql);
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// Manual connection management (if needed)
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$router->incrementConnectionCount($replica);
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// ... use connection ...
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$router->decrementConnectionCount($replica);
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// Track query performance
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$startTime = microtime(true);
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$result = $replica->query($sql);
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$responseTime = (microtime(true) - $startTime) * 1000;
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$router->recordResponseTime($replica, $responseTime);
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```
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## Monitoring & Statistics
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### Comprehensive Routing Statistics
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```php
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$stats = $router->getRoutingStatistics();
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// Returns:
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[
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'total_replicas' => 3,
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'healthy_replicas' => 2,
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'load_balancing_strategy' => 'WEIGHTED',
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'sticky_sessions' => false,
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'replica_details' => [
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0 => [
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'healthy' => true,
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'current_connections' => 15,
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'max_connections' => 50,
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'load_percentage' => 30.0,
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'config_weight' => 100,
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'adjusted_weight' => 85, // Reduced due to load
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'weight_adjustment_factor' => 0.85,
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'avg_response_time_ms' => 120.5,
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'total_queries' => 1540,
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'failed_queries' => 3,
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'success_rate' => 99.81,
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'recent_response_samples' => 100
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],
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// ... other replicas
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]
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]
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```
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### Weight Distribution Analysis
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```php
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$distribution = $router->getWeightDistribution();
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// Returns current weight distribution for healthy replicas:
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[
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0 => [
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'config_weight' => 100,
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'adjusted_weight' => 85,
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'current_connections' => 15,
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'avg_response_time' => 120.5,
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'weight_percentage' => 35.2 // % of total weight
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],
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// ... other healthy replicas
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]
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```
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## Performance Benefits
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### Intelligent Load Distribution
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- **Load-based Adjustment**: Überlastete Replicas erhalten weniger Traffic
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- **Performance-based Routing**: Schnelle Replicas werden bevorzugt
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- **Connection Pool Optimization**: Verhindert Connection-Überlastung
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- **Failover Protection**: Automatischer Fallback bei Replica-Ausfallen
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### Monitoring Integration
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- **Real-time Metrics**: Live-Statistiken für Performance-Monitoring
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- **Health Tracking**: Continuous Health Checks mit Response Time Tracking
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- **Success Rate Monitoring**: Tracking von Query Success/Failure Rates
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- **Load Analysis**: Detaillierte Load-Verteilung für Capacity Planning
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## Weight Calculation Algorithm
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```php
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// Dynamic weight adjustment based on current performance
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$loadFactor = max(0.1, 1 - ($currentConnections / $maxConnections));
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$responseFactor = max(0.1, min(1.0, 100 / $avgResponseTime));
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$adjustedWeight = max(1, round($baseWeight * $loadFactor * $responseFactor));
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```
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**Factors:**
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- **Load Factor**: 10-100% basierend auf Connection-Auslastung
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- **Response Factor**: 10-100% basierend auf Response Time (100ms = Baseline)
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- **Minimum Protection**: Jede Replica behält mindestens 10% Gewichtung
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## Testing
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Comprehensive test suite covering:
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- ✅ Weighted selection distribution accuracy
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- ✅ Load factor calculation with edge cases
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- ✅ Response time factor adjustment
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- ✅ Connection counting accuracy
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- ✅ Response time history window management
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- ✅ Load balancing strategy logic
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- ✅ Routing statistics generation
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All tests pass with 78 assertions validating the complete implementation.
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## Migration from Simple Round Robin
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```php
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// Vorher: Simple Round Robin
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$router = new MasterSlaveRouter(
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$master,
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$replicas,
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new ReadWriteConfig(
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enabled: true,
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loadBalancingStrategy: LoadBalancingStrategy::ROUND_ROBIN
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)
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);
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// Nachher: Intelligent Weighted Balancing
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$router = new MasterSlaveRouter(
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$master,
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$replicas,
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new ReadWriteConfig(
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enabled: true,
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readConnections: $configsWithWeights,
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loadBalancingStrategy: LoadBalancingStrategy::WEIGHTED
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)
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);
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```
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Die Implementierung bietet vollständige Backward-Compatibility mit bestehenden Setups.
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