Recent DiscussionsMost RecentNewest TopicsMost LikesSolutionsTagged:TagRe: Smaller sized cluster NielsWillems The minimum size of a cluster is 2 head nodes + 1 worker node. ESP clusters do have special resource requirements. We suggest at least 8 cores for head node. Re: Welcome to the Azure HDInsight AMA! EricStarker Hello everyone., I am Alicia Li, program manager in HDInsight product group. Happy to help with any HDInsight question, like how to do cost control, autoscale best practice, pricing details etc.