Talk on Metrics at Central Iowa Java User Group.

1. Metrics
Central Iowa Java User Group
7 May 2013
Zach Cox = http://pongr.com/user/z

2. http://metrics.codahale.com
https://github.com/codahale/metrics

3. http://codahale.com/codeconf-2011-
04-09-metrics-metrics-everywhere.
pdf

4. Why Metrics
● Business value = $$$
● Runtime (not design/code/compile/test time)
● Measure runtime behavior
● Make better decisions
● Increase business value

5. Questions
● How many req/sec are we getting now?
● Which SQL is slowest on this page?
● How many sessions are live now?

6. How to Metrics
● Measure stuff
○ Record runtime behavior
○ Manually
○ Instrumentations
○ Metrics API
● Report measurements
○ Visibility into that runtime behavior
○ Humans
○ Machines
○ 3rd-party tools

7. Measure
● Gauge
● Counter
● Meter
● Histogram
● Timer
● Health check

8. Instrument (pre-built Metrics)
● Ehcache
● Apache HttpClient
● JDBI
● Jersey
● Jetty
● Log4j
● Logback
● JVM
● Servlet filter

9. Report
● Console / slf4j / csv
● Graphite
● Ganglia
● HTTP
● JMX
● Write your own...
○ CloudWatch
○ Hadoop/Storm
○ Boundary?

10. Metrics at Pongr
● Scala - much more concise API
● Tons of Timers (poor man's profiling)
● Many Meters
● Couple Counters (Meters & Timers count)
● Graphite (suuucks)
● JMX (wtf?!)
● Multiple servers reporting same metrics
● CloudWatch reporter (someday...)

11. Metrics in Rexster
● https://github.
com/tinkerpop/rexster/wiki/Monitoring

12. Thank You!
● Pongr is hiring = zcox@pongr.com