public void FullFlushShouldNotPropagateSamplingPriority()
{
const int partialFlushThreshold = 3;
Span CreateSpan() => new Span(new SpanContext(42, SpanIdGenerator.ThreadInstance.CreateNew()), DateTimeOffset.UtcNow);
var tracer = new Mock <IDatadogTracer>();
tracer.Setup(t => t.Settings).Returns(new Trace.Configuration.TracerSettings
{
Exporter = new Trace.Configuration.ExporterSettings()
{
PartialFlushEnabled = true,
PartialFlushMinSpans = partialFlushThreshold
}
}.Build());
ArraySegment <Span>?spans = null;
tracer.Setup(t => t.Write(It.IsAny <ArraySegment <Span> >()))
.Callback <ArraySegment <Span> >(s => spans = s);
var traceContext = new TraceContext(tracer.Object);
traceContext.SetSamplingPriority(SamplingPriorityValues.UserKeep);
var rootSpan = CreateSpan();
traceContext.AddSpan(rootSpan);
for (int i = 0; i < partialFlushThreshold - 1; i++)
{
var span = CreateSpan();
traceContext.AddSpan(span);
traceContext.CloseSpan(span);
}
// At this point, only one span is missing to reach the threshold for partial flush
spans.Should().BeNull("partial flush should not have been triggered");
// Closing the root span brings the number of closed spans to the threshold
// but a full flush should be triggered rather than a partial, because every span in the trace has been closed
traceContext.CloseSpan(rootSpan);
spans.Value.Should().NotBeNullOrEmpty("a full flush should have been triggered");
rootSpan.GetMetric(Metrics.SamplingPriority).Should().Be(SamplingPriorityValues.UserKeep, "priority should be assigned to the root span");
spans.Value.Should().OnlyContain(s => s == rootSpan || s.GetMetric(Metrics.SamplingPriority) == null, "only the root span should have a priority");
}
public void PartialFlushShouldPropagateSamplingPriority()
{
const int partialFlushThreshold = 2;
Span CreateSpan() => new Span(new SpanContext(42, SpanIdGenerator.ThreadInstance.CreateNew()), DateTimeOffset.UtcNow);
var tracer = new Mock <IDatadogTracer>();
tracer.Setup(t => t.Settings).Returns(new Trace.Configuration.TracerSettings
{
Exporter = new Trace.Configuration.ExporterSettings()
{
PartialFlushEnabled = true,
PartialFlushMinSpans = partialFlushThreshold
}
}.Build());
ArraySegment <Span>?spans = null;
tracer.Setup(t => t.Write(It.IsAny <ArraySegment <Span> >()))
.Callback <ArraySegment <Span> >(s => spans = s);
var traceContext = new TraceContext(tracer.Object);
traceContext.SetSamplingPriority(SamplingPriorityValues.UserKeep);
var rootSpan = CreateSpan();
// Root span will stay open for the duration of the test
traceContext.AddSpan(rootSpan);
// Add enough child spans to trigger partial flush
for (int i = 0; i < partialFlushThreshold; i++)
{
var span = CreateSpan();
traceContext.AddSpan(span);
traceContext.CloseSpan(span);
}
spans.Value.Should().NotBeNullOrEmpty("partial flush should have been triggered");
spans.Value.Should().OnlyContain(s => (int)s.GetMetric(Metrics.SamplingPriority) == SamplingPriorityValues.UserKeep);
}
public void FlushPartialTraces(bool partialFlush)
{
var tracer = new Mock <IDatadogTracer>();
tracer.Setup(t => t.Settings).Returns(new Trace.Configuration.TracerSettings
{
Exporter = new Trace.Configuration.ExporterSettings()
{
PartialFlushEnabled = partialFlush,
PartialFlushMinSpans = 5
}
}.Build());
var traceContext = new TraceContext(tracer.Object);
void AddAndCloseSpan()
{
var span = new Span(new SpanContext(42, SpanIdGenerator.ThreadInstance.CreateNew()), DateTimeOffset.UtcNow);
traceContext.AddSpan(span);
traceContext.CloseSpan(span);
}
var rootSpan = new Span(new SpanContext(42, SpanIdGenerator.ThreadInstance.CreateNew()), DateTimeOffset.UtcNow);
traceContext.AddSpan(rootSpan);
for (int i = 0; i < 4; i++)
{
AddAndCloseSpan();
}
// At this point in time, we have 4 closed spans in the trace
tracer.Verify(t => t.Write(It.IsAny <ArraySegment <Span> >()), Times.Never);
AddAndCloseSpan();
// Now we have 5 closed spans, partial flush should kick-in if activated
if (partialFlush)
{
tracer.Verify(t => t.Write(It.Is <ArraySegment <Span> >(s => s.Count == 5)), Times.Once);
}
else
{
tracer.Verify(t => t.Write(It.IsAny <ArraySegment <Span> >()), Times.Never);
}
for (int i = 0; i < 5; i++)
{
AddAndCloseSpan();
}
// We have 5 more closed spans, partial flush should kick-in a second time if activated
if (partialFlush)
{
tracer.Verify(t => t.Write(It.Is <ArraySegment <Span> >(s => s.Count == 5)), Times.Exactly(2));
}
else
{
tracer.Verify(t => t.Write(It.IsAny <ArraySegment <Span> >()), Times.Never);
}
traceContext.CloseSpan(rootSpan);
// Now the remaining spans are flushed
if (partialFlush)
{
tracer.Verify(t => t.Write(It.Is <ArraySegment <Span> >(s => s.Count == 1)), Times.Once);
}
else
{
tracer.Verify(t => t.Write(It.Is <ArraySegment <Span> >(s => s.Count == 11)), Times.Once);
}
}
