Hadoop cluster creation in Microsoft Azure

Step 1:
In market place -> Data + Analytics -> HDInsight. In HDInsight default option is Quick Create, change it to Custom(size,settings,apps)

Step 2: Providing details and selecting configuration

Cluster name: Provide a unique name. eg: hadoophortonWks-2

cluster type: Hadoop

cluster login username: this is ambari username eg: admin
cluster password: W3b!6xfMdhaad

we can create one SSH user, Eg: hadoop_1 in this page and later after the cluster creation users can be added via Ambari.

click Next.

Step 3: 
Create a storage account if not exists or choose any one if exists.

Step 4: Choosing data nodes and Head node. In "Number of Worker nodes" we can specify the data nodes count.

Click Next -> Next for Advance settings and complete the cluster creation. This would take about 10 minutes.