Unhandled exception: MetricsStatsActor failed

[EduardGeorgiev]

Unhandled exception: MetricsStatsActor failed

[AntyaDev]

Thanks,
We will try to reproduce it. And I probably will ask more questions :)

[AntyaDev]

Hi @EduardGeorgiev ,
Thank you for this information. Is it easy to reproduce? If yes what steps to be done to achieve the same effect?

[EduardGeorgiev]

Hello @AntyaDev . I am unsure of exactly what caused it, but here's some info:
In the beginning I set:

        GCSettings.LatencyMode = GCLatencyMode.SustainedLowLatency;

Load Simulations:

        var trafficPerSecond = 150;
            Simulation.RampingInject(rate: (int)(trafficPerSecond * 1f), interval: TimeSpan.FromSeconds(1), during: TimeSpan.FromMinutes(1)), // 66% => 100%
            Simulation.Inject(rate: (int)(trafficPerSecond * 1f), interval: TimeSpan.FromSeconds(1), during: TimeSpan.FromMinutes(9)), // 100%
            Simulation.RampingInject(rate: (int)(trafficPerSecond * 2f), interval: TimeSpan.FromSeconds(1), during: TimeSpan.FromMinutes(1)), // 100% => 200%
            Simulation.Inject(rate: (int)(trafficPerSecond * 2f), interval: TimeSpan.FromSeconds(1), during: TimeSpan.FromMinutes(1)) // 200% for extra confidence

The scenario is .WithMaxFailCount(500000), I had more than 30K failures by the end of it.
My internet was slow, I believe it was still bombing even 30minutes after "Waiting on scenarios completion...", which was peculiar to me, as I was hoping NBomber to have some safeguards to alert me in case the requests are going out too slow for the requested bombing speed.
My config:

{
  "TestSuite": "Ticket Options Tests",
  "TestName": "Ticket Options Load Test",
  "GlobalSettings": {
    "ReportFormats": [ "Html", "Txt", "Csv", "Md" ]
  }
}

Runner:

        var fileDate = DateTimeOffset.Now.ToUnixTimeSeconds().ToString();
        var runner = NBomberRunner
            .RegisterScenarios(scenarioTicketOptionsLoadTest)
            .LoadConfig("config.json")
            .WithReportFolder(Path.Combine(resultsDir, fileDate))
            .WithReportFileName($"report_{fileDate}")
            .WithLoggerConfig(() =>
                new LoggerConfiguration()
                    .MinimumLevel.Debug()
                    .WriteTo.File(
                        path: Path.Combine(solutionDir, "logs", "log.txt"),
                        outputTemplate:
                        "{Timestamp:yyyy-MM-dd HH:mm:ss.fff zzz} [{Level:u3}] [ThreadId:{ThreadId}] {Message:lj}{NewLine}{Exception}",
                        rollingInterval: RollingInterval.Day)
            )
            .WithLicense(Settings.LicenseKey);

That's about it.