Updating twitter streaming sample to include default values for hostname and port

Author: Rahul Ajmera

samples/features/sql-big-data-cluster/spark/data-loading/spark-twitter-streaming-sample.ipynb

@@ -89,6 +89,26 @@
             "outputs": [],
             "execution_count": 0
         },
+        {
+            "cell_type": "markdown",
+            "source": [
+                "Use the following cell to check your server name. If it returns ```master-0```, your hostname will be ```master-0.master-svc```. You will define this value in the Parameters section."
+            ],
+            "metadata": {
+                "azdata_cell_guid": "02e6cd9a-ef88-419c-afa0-e6a666f1070e"
+            }
+        },
+        {
+            "cell_type": "code",
+            "source": [
+                "SELECT @@Servername;"
+            ],
+            "metadata": {
+                "azdata_cell_guid": "0827942d-a223-4ba8-8168-2fb57a4a2488"
+            },
+            "outputs": [],
+            "execution_count": 0
+        },
         {
             "cell_type": "markdown",
             "source": [
@@ -141,7 +161,7 @@
                 "### **2.4 Parameters**\r\n",
                 "Enter the required parameters for the Spark streaming job to connect to SQL Server.\r\n",
                 "\r\n",
-                "In this example, the connection is made from Spark to the SQL Server master instance using the internal DNS name (master-9.master-svc) and port (1433).  Alternatively, and especially if you are using a highly available Always On Availability Group, you can connect to the Kubernetes service that exposes the primary node of the Always On Availability Group.\r\n",
+                "In this example, the connection is made from Spark to the SQL Server master instance using the internal DNS name (Ex: master-0.master-svc) and port (1433).  Alternatively, and especially if you are using a highly available Always On Availability Group, you can connect to the Kubernetes service that exposes the primary node of the Always On Availability Group.\r\n",
                 "\r\n",
                 "####  Parameters needed to create Twitter stream\r\n",
                 "- Twitter API authentication keys\r\n",
@@ -178,8 +198,8 @@
                 "val password = \"password\"\r\n",
                 "\r\n",
                 "// Spark-SQL connector parameters\r\n",
-                "val hostname = \"\"\r\n",
-                "val port = 0000\r\n",
+                "val hostname = \"master-0.master-svc\"\r\n",
+                "val port = 1433\r\n",
                 "val database = \"TwitterData\"\r\n",
                 "val url = s\"jdbc:sqlserver://${hostname}:${port};database=${database};user=${user};password=${password};\"\r\n",
                 "val dbtable = \"Tweets\"\r\n",