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Preserve deterministic sampler rates #12382

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Merged
gh-worker-dd-mergequeue-cf854d merged 4 commits into from
Sep 3, 2026
Merged

Preserve deterministic sampler rates #12382

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4ecfed6
fix(sampling): preserve deterministic sampler rate
MilanGarnier Sep 2, 2026
f9e6ae4
style(sampling): apply spotless formatting
MilanGarnier Sep 2, 2026
d4ffb78
Merge branch 'master' into milan.garnier/preserve-deterministic-sampl…
MilanGarnier Sep 3, 2026
1563631
Merge branch 'master' into milan.garnier/preserve-deterministic-sampl…
MilanGarnier Sep 3, 2026
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4 changes: 2 additions & 2 deletions dd-trace-core/src/main/java/datadog/trace/common/sampling/DeterministicSampler.java
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Expand Up @@ -38,11 +38,11 @@ protected <T extends CoreSpan<T>> long getSamplingId(T span) {

private static final double MAX = Math.pow(2, 64) - 1;

private final float rate;
private final double rate;
private final long threshold;

public DeterministicSampler(final double rate) {
this.rate = (float) rate;
this.rate = rate;
this.threshold = cutoff(rate);
}

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5 changes: 5 additions & 0 deletions dd-trace-core/src/test/java/datadog/trace/common/sampling/DeterministicTraceSamplerTest.java
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Expand Up @@ -357,6 +357,11 @@ void testSamplingAll(String traceId) {
assertTrue(sampler.sample(span));
}

@TableTest({"rate ", "0.123456789", "0.999999999"})
void preservesConfiguredSampleRate(double rate) {
assertEquals(rate, new DeterministicSampler.TraceSampler(rate).getSampleRate());
}

@ParameterizedTest(name = "rate={0}")
@MethodSource("testCutoffCalculationArguments")
void testCutoffCalculation(int rate) {
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