Monitoring in Hadoop
Monitoring, as any system administrator will tell you, is ideal for getting to the root of performance issues. Monitoring can help you understand why a system is out of CPU or RAM resources, for example, and notify you when CPU or RAM usage nears a specified percent. What your system administrator may not know (but you can explain after reading this chapter) is that monitoring is equally well suited for ferreting out security issues.
Consider a scenario: You manage a Hadoop cluster (as system administrator) and are concerned about two specific users: Bob, a confirmed hacker, and Steve, who loves to run queries that ...