Resiliency Policies

Polecat includes built-in resiliency for transient SQL Server failures using Polly.

Default Behavior

By default, Polecat retries on transient SQL Server errors (deadlocks, timeouts, connection failures) with an exponential backoff strategy.

Custom Polly Configuration

Replace the Default Pipeline

opts.ConfigurePolly(builder =>
{
    builder.AddRetry(new RetryStrategyOptions
    {
        MaxRetryAttempts = 5,
        BackoffType = DelayBackoffType.Exponential,
        Delay = TimeSpan.FromMilliseconds(200)
    });
});

Extend the Default Pipeline

opts.ExtendPolly(builder =>
{
    builder.AddTimeout(TimeSpan.FromSeconds(30));
});

Circuit Breaker

You can add a circuit breaker to prevent cascading failures:

opts.ExtendPolly(builder =>
{
    builder.AddCircuitBreaker(new CircuitBreakerStrategyOptions
    {
        FailureRatio = 0.5,
        MinimumThroughput = 10,
        SamplingDuration = TimeSpan.FromSeconds(30),
        BreakDuration = TimeSpan.FromSeconds(15)
    });
});