Wednesday, January 23, 2019

Edge nodes

  • Edge nodes are the interface between the Hadoop cluster and the outside network. For this reason, they’re sometimes referred to as gateway nodes. Most commonly, edge nodes are used to run client applications and cluster administration tools.
  • They’re also often used as staging areas for data being transferred into the Hadoop cluster. As such, Oozie, Pig, Sqoop, and management tools such as Hue and Ambari run well there. The figure shows the processes you can run on Edge nodes.
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  • They have hardware requirements that are different from master nodes and slave nodes.In general, it’s a good idea to minimize deployments of administration tools on master nodes and slave nodes to ensure that critical Hadoop services like the NameNode have as little competition for resources as possible.

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