What is Hadoop Metrics2? by Ahmed Radwan.
I’ve been wondering about that. How about you? 😉
From the post:
Metrics are collections of information about Hadoop daemons, events and measurements; for example, data nodes collect metrics such as the number of blocks replicated, number of read requests from clients, and so on. For that reason, metrics are an invaluable resource for monitoring Hadoop services and an indispensable tool for debugging system problems.
This blog post focuses on the features and use of the Metrics2 system for Hadoop, which allows multiple metrics output plugins to be used in parallel, supports dynamic reconfiguration of metrics plugins, provides metrics filtering, and allows all metrics to be exported via JMX.
However cool the software, can’t ever really get away from managing the software.
And it isn’t a bad skill to have. Read on!