IDocumentSessionExtensions.cs

public static class IDocumentSessionExtensions
{
    private static readonly Policy RetryPolicy = Policy
        .Handle<WebException>(ex => TransientErrors.Contains(ex.Status))
        .WaitAndRetry(new[]
        {
            TimeSpan.FromSeconds(1),
            TimeSpan.FromSeconds(2),
            TimeSpan.FromSeconds(3)
        });

    private static readonly HashSet<WebExceptionStatus> TransientErrors = new HashSet<WebExceptionStatus>(new[]
    {
        WebExceptionStatus.ConnectFailure,
        WebExceptionStatus.ConnectionClosed,
        WebExceptionStatus.KeepAliveFailure,
        WebExceptionStatus.Pending,
        WebExceptionStatus.PipelineFailure,
        WebExceptionStatus.ProtocolError,
        WebExceptionStatus.ReceiveFailure,
        WebExceptionStatus.RequestCanceled,
        WebExceptionStatus.SecureChannelFailure,
        WebExceptionStatus.SendFailure,
        WebExceptionStatus.Timeout
    });

    public static void SaveChangesWithRetry(this IDocumentSession session)
    {
        RetryPolicy.Execute(session.SaveChanges);
    }
}

Uses Polly to provide a reliable wrapper for raven. Useful when you're hosting on Azure.