There is a current Hive metrics system that hooks up to a JMX reporting, but all its measurements, models are custom.
This is to make another metrics system that will be based on Codahale (ie yammer, dropwizard), which has the following advantage:
- Well-defined metric model for frequently-needed metrics (ie JVM metrics)
- Well-defined measurements for all metrics (ie max, mean, stddev, mean_rate, etc),
- Built-in reporting frameworks like JMX, Console, Log, JSON webserver
It is used for many projects, including several Apache projects like Oozie. Overall, monitoring tools should find it easier to understand these common metric, measurement, reporting models.
The existing metric subsystem will be kept and can be enabled if backward compatibility is desired.