@Robin Dong Response to your questions: Can I include all nodes in installation, only basic hadoop installation on these 4 nodes only, then install third party tools on them? Yes 0. when start cluster installation, I can list all of 10 server for this cluster installation, right? these 4 nodes supposed to be part of hadoop cluster. Yes, you can list all of them and assign clients on 4 nodes which you would like to make them client nodes. 1. During the cluster installation, is any where I can assign a role 'client' to these 4 nodes? Yes 2. if yes, please show me a link, need to see exact step to setup 'role', role as client? got to be a role for these 4 nodes. http://docs.hortonworks.com/HDPDocuments/Ambari-2.4.2.0/bk_ambari-installation/content/assign_slaves_and_clients.html 3. if not, may I just hadoop on these nodes and simply install third party tools. I already have Ambari installed on a separated server. If you want to manage those 4 nodes by Ambari make them part of cluster and install only clients and install your 3rd part tools. If you don't want to manage those 4 nodes by Ambari even in future, then install only clients from command line and copy the Hadoop configuration from existing cluster to these machines. Hope this helps you.
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