From 4517f89a457ab3a157bfc85ebb21fbb2b9be75f4 Mon Sep 17 00:00:00 2001
From: Iman Malik <imanmalik@microsoft.com>
Date: Fri, 3 Jun 2022 12:59:01 -0400
Subject: [PATCH] perf improvement: change string equality check to reference
 equals

---
 .../src/Tracing/TraceData/ClientConfigurationTraceDatum.cs      | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/Microsoft.Azure.Cosmos/src/Tracing/TraceData/ClientConfigurationTraceDatum.cs b/Microsoft.Azure.Cosmos/src/Tracing/TraceData/ClientConfigurationTraceDatum.cs
index 64b59df041..dff3ec159c 100644
--- a/Microsoft.Azure.Cosmos/src/Tracing/TraceData/ClientConfigurationTraceDatum.cs
+++ b/Microsoft.Azure.Cosmos/src/Tracing/TraceData/ClientConfigurationTraceDatum.cs
@@ -58,7 +58,7 @@ public ReadOnlyMemory<byte> SerializedJson
                 if (this.cachedUserAgentString != this.UserAgentContainer.UserAgent ||
                     this.cachedNumberOfClientCreated != CosmosClient.numberOfClientsCreated ||
                     this.cachedNumberOfActiveClient != CosmosClient.NumberOfActiveClients ||
-                    this.cachedMachineId != VmMetadataApiHandler.GetMachineId())
+                    !ReferenceEquals(this.cachedMachineId, VmMetadataApiHandler.GetMachineId()))
                 {
                     this.cachedNumberOfActiveClient = CosmosClient.NumberOfActiveClients;
                     this.cachedNumberOfClientCreated = CosmosClient.numberOfClientsCreated;