Benchmark: Adds region to configuration options

Microsoft.Azure.Cosmos.Samples/Tools/Benchmark/BenchmarkConfig.cs

@@ -141,6 +141,9 @@ public class BenchmarkConfig
         [Option(Required = false, HelpText = "Enable Client Telemetry Feature in SDK. Make sure you enable it from the portal also.")]
         public bool EnableTelemetry { get; set; } = false;
 
+        [Option(Required = false, HelpText = "List of comma separated preferred regions.")]
+        public string ApplicationPreferredRegions { get; set; } = null;
+
         internal int GetTaskCount(int containerThroughput)
         {
             int taskCount = this.DegreeOfParallelism;
@@ -224,9 +227,14 @@ internal Microsoft.Azure.Cosmos.CosmosClient CreateCosmosClient(string accountKe
                 {
                     DisableSendingMetricsToService = !this.EnableTelemetry,
                     DisableDistributedTracing = !this.EnableDistributedTracing
-                }
+                },
             };
 
+            if(!string.IsNullOrEmpty(this.ApplicationPreferredRegions))
+            {
+                clientOptions.ApplicationPreferredRegions = this.ApplicationPreferredRegions.Split(',');
+            }
+
             if (!string.IsNullOrWhiteSpace(this.ConsistencyLevel))
             {
                 clientOptions.ConsistencyLevel = (Microsoft.Azure.Cosmos.ConsistencyLevel)Enum.Parse(typeof(Microsoft.Azure.Cosmos.ConsistencyLevel), this.ConsistencyLevel, ignoreCase: true);

Microsoft.Azure.Cosmos.Samples/Tools/Benchmark/README.md

@@ -121,6 +121,7 @@ Copyright (C) 2019 CosmosBenchmark
   --resultskey                      Key to publish results to
   --resultsdatabase                 Database to publish results to
   --resultscontainer                Container to publish results to
+  --applicationpreferredregions     List of comma seperated preferred regions
   --help                            Display this help screen.
   --version                         Display version information.
 ```