In this chapter, we will change our focus a little and look at some of the considerations you will face when running an operational Hadoop cluster. In particular, we will cover the following topics:
Why a developer should care about operations and why Hadoop operations are different
More detail on Cloudera Manager and its capabilities and limitations
Designing a cluster for use on both physical hardware and EMR
Securing a Hadoop cluster
Hadoop monitoring
Troubleshooting problems with an application running on Hadoop