APPENDIX D

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Hadoop Metrics and Their Relevance to Security

In Chapter 7’s “Hadoop Metrics” section, you reviewed what Hadoop metrics are, how you can apply filters to metrics, and how you can direct them to a file or monitoring software such as Ganglia. As you will soon learn, you can use these metrics for security, as well.

As you will remember, you can use Hadoop metrics to set alerts to capture sudden changes in system resources. In addition, you can set up your Hadoop cluster to monitor NameNode resources and generate alerts when any specified resources deviate from desired parameters. For example, I will show you how to generate alerts when ...

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