Summary
In this chapter, we learned about the state management analogy of YARN and why it is important. We discussed about the ResourceManager and NodeManager views for the different processes associated with the YARN framework. This chapter provides core concepts about how YARN monitors and manages the resources or application execution over YARN. You can now easily scan the logs for ResourceManager or NodeManager and observe the messages during state transitions of a node, an application, or a container, and so on.
In the next chapter, we'll talk about the execution of MapReduce applications over a YARN cluster and how you can migrate from MRv1 to MRv2.
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