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Presentation done at the Portuguese JUG http://jug.pt/, about the metrics library from Yammer http://metrics.codahale.com/.
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or business value optimization?performance monitoring
metrics
Terça-feira, 29 de Janeiro de 13
Me
Terça-feira, 29 de Janeiro de 13
• CTO at Cult of Bits
• 10+ years of professional Java development
MeTerça-feira, 29 de Janeiro de 13
Why?
Terça-feira, 29 de Janeiro de 13
Why?
Ultimately it’s aboutBusiness Value
Terça-feira, 29 de Janeiro de 13
Why?
To make informed Business decisions we need to know the reality of our software
Terça-feira, 29 de Janeiro de 13
Why?
How many errors are our users seeing?
Terça-feira, 29 de Janeiro de 13
Why?
Is our App fast enough?
Terça-feira, 29 de Janeiro de 13
Why?
Were our assumptions about performance/usage patterns
proven correct?
Terça-feira, 29 de Janeiro de 13
The Metrics library
Terça-feira, 29 de Janeiro de 13
The metrics library
Metrics is a Java library which gives you unparalleled insight into what your code does in production.
Developed by Yammer to instrument their JVM-based backend services, Metrics provides a powerful toolkit of ways to measure the behavior of
critical components in your production environment.
source: http://metrics.codahale.com/
Terça-feira, 29 de Janeiro de 13
Types of Metrics
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• Gauges• Counters• Histograms• Meters• Timers
Types of MetricsTerça-feira, 29 de Janeiro de 13
Structure of metrics
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Structure of metrics
Group Top level grouping (“package name”)
Type Second level grouping (“class name”)
Name the metric name (e.g.,“error-count”)
Scope optional
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Outputs
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• JMX• Console• CSV files• JSON servlet• Graphite• Ganglia
OutputsTerça-feira, 29 de Janeiro de 13
DEMO TIME
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What to measure?
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“If it could affect business value, measure it” Coda Hale - metrics’ author
At yammer they can have up to 40/50 metrics per service
What to Measure?At yammer they can have up to 40/50 metrics per service
Terça-feira, 29 de Janeiro de 13
REST requests
Timer
What to Measure?At yammer they can have up to 40/50 metrics per service
Terça-feira, 29 de Janeiro de 13
MySQL/couchdb/Solr queries
Timer
What to Measure?At yammer they can have up to 40/50 metrics per service
Terça-feira, 29 de Janeiro de 13
Calls to external services/processes
Timer
What to Measure?At yammer they can have up to 40/50 metrics per service
Terça-feira, 29 de Janeiro de 13
Dimensions of requests/responses
Histogram
Examples:
•Search “page” size
•Depth of search requests
•Number of search terms used
What to Measure?At yammer they can have up to 40/50 metrics per service
Terça-feira, 29 de Janeiro de 13
ERRORS!
Counter / Meter
What to Measure?At yammer they can have up to 40/50 metrics per service
Terça-feira, 29 de Janeiro de 13
The CoBexperience
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Our use-case
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• Lots of applications in different sites
• 1-3 servers• No full-time network access
Our use-caseTerça-feira, 29 de Janeiro de 13
lessons learned
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lessons learned
Naming metrics can be hard
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lessons learned
Creating metrics is just the start
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lessons learned
Having hard data to help decision is pricelless
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References
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The Metrics Homepagehttp://metrics.codahale.com/
Metrics, Metrics, Everywhere - Coda Hale http://www.youtube.com/watch?v=czes-oa0yik
Graphitehttp://graphite.wikidot.com/
ReferencesTerça-feira, 29 de Janeiro de 13
Thank you!
Terça-feira, 29 de Janeiro de 13
