public void SiloEventuallyBecomesDead()
{
var now = new[] { DateTime.UtcNow };
var options = new ServiceFabricMembershipOptions();
var monitor = new UnknownSiloMonitor(new OptionsWrapper <ServiceFabricMembershipOptions>(options), this.Logger)
{
GetDateTime = () => now[0]
};
var knownSilos = new Dictionary <SiloAddress, SiloStatus>
{
[NewSiloAddress("2.2.2.2", 9030, 2)] = SiloStatus.Active
};
// Report a silo as having an unknown status.
var deadSilo = NewSiloAddress("1.1.1.1", 9030, 1000);
monitor.ReportUnknownSilo(deadSilo);
// No time has passed and the set of known silos contains no information about the reported silo,
// therefore we expect no reports even after running multiple times.
Assert.Empty(monitor.DetermineDeadSilos(knownSilos));
Assert.Empty(monitor.DetermineDeadSilos(knownSilos));
// Advance passed the expiration time.
now[0] += options.UnknownSiloRemovalPeriod + TimeSpan.FromMilliseconds(1);
// The silo should be declared dead by the monitor.
Assert.Contains(deadSilo, monitor.DetermineDeadSilos(knownSilos));
}
public void SiloNotDeclaredDeadWhenSupersededOnSameAddressDifferentPort()
{
var now = new[] { DateTime.UtcNow };
var options = new ServiceFabricMembershipOptions();
var monitor = new UnknownSiloMonitor(new OptionsWrapper <ServiceFabricMembershipOptions>(options), this.Logger)
{
GetDateTime = () => now[0]
};
var deadSilo = NewSiloAddress("1.1.1.1", 1111, 1000);
var supersedingSilo = NewSiloAddress("1.1.1.1", 9999, 2000);
var knownSilos = new Dictionary <SiloAddress, SiloStatus>
{
[supersedingSilo] = SiloStatus.Active
};
// Report a silo as having an unknown status.
monitor.ReportUnknownSilo(deadSilo);
// The silo is not declared dead.
Assert.Empty(monitor.DetermineDeadSilos(knownSilos));
}
public void SiloDeclaredDeadWhenSupersededOnSameEndpoint()
{
var now = new[] { DateTime.UtcNow };
var options = new ServiceFabricMembershipOptions();
var monitor = new UnknownSiloMonitor(new OptionsWrapper <ServiceFabricMembershipOptions>(options), this.Logger)
{
GetDateTime = () => now[0]
};
var knownSilos = new Dictionary <SiloAddress, SiloStatus>();
// Report a silo as having an unknown status.
var deadSilo = NewSiloAddress("1.1.1.1", 9030, 1000);
monitor.ReportUnknownSilo(deadSilo);
Assert.Empty(monitor.DetermineDeadSilos(knownSilos));
// Create a silo with the same IP and port but a lower generation.
var predecessorSilo = NewSiloAddress("1.1.1.1", 9030, 500);
knownSilos[predecessorSilo] = SiloStatus.Active;
Assert.Empty(monitor.DetermineDeadSilos(knownSilos));
knownSilos[predecessorSilo] = SiloStatus.Dead;
Assert.Empty(monitor.DetermineDeadSilos(knownSilos));
// Create a silo with the same IP and port but a higher generation.
var supersedingSilo = NewSiloAddress("1.1.1.1", 9030, 2000);
// A status of None is equivalent to no status, so no declarations should be made.
knownSilos[supersedingSilo] = SiloStatus.None;
Assert.Empty(monitor.DetermineDeadSilos(knownSilos));
// The silo should be declared dead by the monitor even if the newer silo is dead.
knownSilos[supersedingSilo] = SiloStatus.Dead;
Assert.Contains(deadSilo, monitor.DetermineDeadSilos(knownSilos));
// The silo should be declared dead by the monitor.
knownSilos[supersedingSilo] = SiloStatus.Active;
Assert.Contains(deadSilo, monitor.DetermineDeadSilos(knownSilos));
}
