From b4c34bda23b5a3b02b1b5396f3b322b4c0302a3c Mon Sep 17 00:00:00 2001
From: Daniel Dyla <dyladan@users.noreply.github.com>
Date: Wed, 5 May 2021 10:38:34 -0400
Subject: [PATCH] fix: use invalid parent for sampler when options.root

---
 packages/opentelemetry-tracing/src/Tracer.ts | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/packages/opentelemetry-tracing/src/Tracer.ts b/packages/opentelemetry-tracing/src/Tracer.ts
index 3b58b1739db..314ccbba726 100644
--- a/packages/opentelemetry-tracing/src/Tracer.ts
+++ b/packages/opentelemetry-tracing/src/Tracer.ts
@@ -16,8 +16,8 @@
 
 import * as api from '@opentelemetry/api';
 import {
-  InstrumentationLibrary,
   IdGenerator,
+  InstrumentationLibrary,
   RandomIdGenerator,
   sanitizeAttributes,
 } from '@opentelemetry/core';
@@ -87,7 +87,9 @@ export class Tracer implements api.Tracer {
     const attributes = sanitizeAttributes(options.attributes);
     // make sampling decision
     const samplingResult = this._sampler.shouldSample(
-      context,
+      options.root
+        ? api.setSpanContext(context, api.INVALID_SPAN_CONTEXT)
+        : context,
       traceId,
       name,
       spanKind,