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The Yarn (ie MapReduce) framework consists of three topology level:
- federation of independent cluster
- application (that the Yarn cluster runs)
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Level
Federation
Federation allow multiple independent clusters to be used together for very large jobs, or for tenants who have capacity across all of them.
Cluster
On a cluster level, Yarn consists of:
- a single global leader process ResourceManager,
- a per-node (worker|agent) NodeManager ,
More … see Cluster
Application
On a application level, Yarn consists of:
- a per-application ApplicationMaster
- a per-application Container running on a NodeManager