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[Tracing Framework] Adding support of Head based Sampler based on tra…
…ce header & probability (opensearch-project#8918) Signed-off-by: Dev Agarwal <devagarwal1803@gmail.com>
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60 changes: 60 additions & 0 deletions
60
...ns/telemetry-otel/src/main/java/org/opensearch/telemetry/tracing/sampler/HeadSampler.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,60 @@ | ||
| /* | ||
| * SPDX-License-Identifier: Apache-2.0 | ||
| * | ||
| * The OpenSearch Contributors require contributions made to | ||
| * this file be licensed under the Apache-2.0 license or a | ||
| * compatible open source license. | ||
| */ | ||
|
|
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| package org.opensearch.telemetry.tracing.sampler; | ||
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| import io.opentelemetry.api.common.AttributeKey; | ||
| import io.opentelemetry.api.common.Attributes; | ||
| import io.opentelemetry.api.trace.SpanKind; | ||
| import io.opentelemetry.context.Context; | ||
| import io.opentelemetry.sdk.trace.data.LinkData; | ||
| import io.opentelemetry.sdk.trace.samplers.Sampler; | ||
| import io.opentelemetry.sdk.trace.samplers.SamplingResult; | ||
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| import java.util.List; | ||
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| /** | ||
| * HeadBased sampler | ||
| */ | ||
| public class HeadSampler implements Sampler { | ||
| private final Sampler defaultSampler; | ||
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| /** | ||
| * Creates Head based sampler | ||
| * @param defaultSampler defaultSampler | ||
| */ | ||
| public HeadSampler(Sampler defaultSampler) { | ||
| this.defaultSampler = defaultSampler; | ||
| } | ||
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| @Override | ||
| public SamplingResult shouldSample( | ||
| Context parentContext, | ||
| String traceId, | ||
| String name, | ||
| SpanKind spanKind, | ||
| Attributes attributes, | ||
| List<LinkData> parentLinks) { | ||
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| if (attributes.get(AttributeKey.stringKey("trace")) != null && Boolean.parseBoolean(attributes.get(AttributeKey.stringKey("trace"))) ) { | ||
| return SamplingResult.recordAndSample(); | ||
| } else { | ||
| return defaultSampler.shouldSample(parentContext, traceId, name, spanKind, attributes, parentLinks); | ||
| } | ||
| } | ||
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| @Override | ||
| public String getDescription() { | ||
| return "HeadSampler"; | ||
| } | ||
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| @Override | ||
| public String toString() { | ||
| return getDescription(); | ||
| } | ||
| } |
75 changes: 75 additions & 0 deletions
75
...try-otel/src/main/java/org/opensearch/telemetry/tracing/sampler/ProbabilisticSampler.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,75 @@ | ||
| package org.opensearch.telemetry.tracing.sampler; | ||
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| import io.opentelemetry.api.common.Attributes; | ||
| import io.opentelemetry.api.trace.SpanKind; | ||
| import io.opentelemetry.context.Context; | ||
| import io.opentelemetry.sdk.trace.data.LinkData; | ||
| import io.opentelemetry.sdk.trace.samplers.Sampler; | ||
| import io.opentelemetry.sdk.trace.samplers.SamplingResult; | ||
| import org.opensearch.telemetry.OTelTelemetrySettings; | ||
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| import java.util.List; | ||
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| /** | ||
| * ProbabilisticSampler implements a head-based sampling strategy based on provided settings. | ||
| */ | ||
| public class ProbabilisticSampler implements Sampler { | ||
| private Sampler defaultSampler; | ||
| private final OTelTelemetrySettings oTelTelemetrySettings; | ||
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| private double tracerHeadSamplerSamplingRatio; | ||
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| /** | ||
| * Constructor | ||
| * | ||
| * @param oTelTelemetrySettings Telemetry settings. | ||
| */ | ||
| public ProbabilisticSampler(OTelTelemetrySettings oTelTelemetrySettings) { | ||
| if (oTelTelemetrySettings == null) { | ||
| throw new IllegalArgumentException("oTelTelemetrySettings cannot be null"); | ||
| } | ||
| this.oTelTelemetrySettings = oTelTelemetrySettings; | ||
| this.tracerHeadSamplerSamplingRatio = oTelTelemetrySettings.getTracerHeadSamplerSamplingRatio(); | ||
| this.defaultSampler = createProbabilitySampler(tracerHeadSamplerSamplingRatio); | ||
| } | ||
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| private Sampler createProbabilitySampler(double samplingRatio) { | ||
| return Sampler.traceIdRatioBased(samplingRatio); | ||
| } | ||
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| Sampler getSampler() { | ||
| double newSamplingRatio = oTelTelemetrySettings.getTracerHeadSamplerSamplingRatio(); | ||
| if(isSamplingRatioChanged(newSamplingRatio)){ | ||
| this.tracerHeadSamplerSamplingRatio = newSamplingRatio; | ||
| defaultSampler = createProbabilitySampler(tracerHeadSamplerSamplingRatio); | ||
| } | ||
| return defaultSampler; | ||
| } | ||
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| private boolean isSamplingRatioChanged(double newSamplingRatio) { | ||
| return Double.compare(this.tracerHeadSamplerSamplingRatio, newSamplingRatio)!=0; | ||
| } | ||
| double getTracerHeadSamplerSamplingRatio() { | ||
| return tracerHeadSamplerSamplingRatio; | ||
| } | ||
| @Override | ||
| public SamplingResult shouldSample( | ||
| Context parentContext, | ||
| String traceId, | ||
| String name, | ||
| SpanKind spanKind, | ||
| Attributes attributes, | ||
| List<LinkData> parentLinks) { | ||
| return getSampler().shouldSample(parentContext, traceId, name, spanKind, attributes, parentLinks); | ||
| } | ||
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| @Override | ||
| public String getDescription() { | ||
| return "Probabilistic Sampler"; | ||
| } | ||
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| @Override | ||
| public String toString() { | ||
| return getDescription(); | ||
| } | ||
| } |
12 changes: 12 additions & 0 deletions
12
...s/telemetry-otel/src/main/java/org/opensearch/telemetry/tracing/sampler/package-info.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,12 @@ | ||
| /* | ||
| * SPDX-License-Identifier: Apache-2.0 | ||
| * | ||
| * The OpenSearch Contributors require contributions made to | ||
| * this file be licensed under the Apache-2.0 license or a | ||
| * compatible open source license. | ||
| */ | ||
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| /** | ||
| * This package contains classes needed for HeadBased Sampler. | ||
| */ | ||
| package org.opensearch.telemetry.tracing.sampler; |
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80 changes: 80 additions & 0 deletions
80
...lemetry-otel/src/test/java/org/opensearch/telemetry/tracing/sampler/HeadSamplerTests.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,80 @@ | ||
| /* | ||
| * SPDX-License-Identifier: Apache-2.0 | ||
| * | ||
| * The OpenSearch Contributors require contributions made to | ||
| * this file be licensed under the Apache-2.0 license or a | ||
| * compatible open source license. | ||
| */ | ||
|
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| package org.opensearch.telemetry.tracing.sampler; | ||
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| import io.opentelemetry.api.common.AttributeKey; | ||
| import io.opentelemetry.api.trace.SpanKind; | ||
| import org.opensearch.test.OpenSearchTestCase; | ||
| import io.opentelemetry.sdk.trace.samplers.Sampler; | ||
| import io.opentelemetry.context.Context; | ||
| import io.opentelemetry.sdk.trace.samplers.SamplingResult; | ||
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| import static org.mockito.ArgumentMatchers.any; | ||
| import static org.mockito.ArgumentMatchers.anyString; | ||
| import static org.mockito.Mockito.mock; | ||
| import static org.mockito.Mockito.when; | ||
| import static org.mockito.Mockito.verify; | ||
| import static org.mockito.Mockito.never; | ||
| import io.opentelemetry.api.common.Attributes; | ||
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| import java.util.Collections; | ||
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| public class HeadSamplerTests extends OpenSearchTestCase { | ||
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| public void testShouldSampleWithTraceAttributeAsTrue() { | ||
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| // Create a mock default sampler | ||
| Sampler defaultSampler = mock(Sampler.class); | ||
| when(defaultSampler.shouldSample(any(), anyString(), anyString(), any(), any(), any())) | ||
| .thenReturn(SamplingResult.drop()); | ||
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| // Create an instance of HeadSampler with the mock default sampler | ||
| HeadSampler headSampler = new HeadSampler(defaultSampler); | ||
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| // Create a mock Context and Attributes | ||
| Context parentContext = mock(Context.class); | ||
| Attributes attributes = Attributes.of(AttributeKey.stringKey("trace"), "true"); | ||
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| // Call shouldSample on HeadSampler | ||
| SamplingResult result = headSampler.shouldSample(parentContext, "traceId", "spanName", | ||
| SpanKind.INTERNAL, attributes, Collections.emptyList()); | ||
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| assertEquals(SamplingResult.recordAndSample(), result); | ||
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| // Verify that the default sampler's shouldSample method was not called | ||
| verify(defaultSampler, never()).shouldSample(any(), anyString(), anyString(), any(), any(), any()); | ||
| } | ||
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| public void testShouldSampleWithoutTraceAttribute() { | ||
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| // Create a mock default sampler | ||
| Sampler defaultSampler = mock(Sampler.class); | ||
| when(defaultSampler.shouldSample(any(), anyString(), anyString(), any(), any(), any())) | ||
| .thenReturn(SamplingResult.recordAndSample()); | ||
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| // Create an instance of HeadSampler with the mock default sampler | ||
| HeadSampler headSampler = new HeadSampler(defaultSampler); | ||
|
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| // Create a mock Context and Attributes | ||
| Context parentContext = mock(Context.class); | ||
| Attributes attributes = Attributes.empty(); | ||
|
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| // Call shouldSample on HeadSampler | ||
| SamplingResult result = headSampler.shouldSample(parentContext, "traceId", "spanName", | ||
| SpanKind.INTERNAL, attributes, Collections.emptyList()); | ||
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| // Verify that HeadSampler returned SamplingResult.recordAndSample() | ||
| assertEquals(SamplingResult.recordAndSample(), result); | ||
|
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| // Verify that the default sampler's shouldSample method was called | ||
| verify(defaultSampler).shouldSample(any(), anyString(), anyString(), any(), any(), any()); | ||
| } | ||
|
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| } |
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