metrics - performance monitoring or business value optimization?

or business value optimization?performance monitoring

metrics

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Me

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• CTO at Cult of Bits

• 10+ years of professional Java development

MeTerça-feira, 29 de Janeiro de 13

Why?

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Why?

Ultimately it’s aboutBusiness Value

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Why?

To make informed Business decisions we need to know the reality of our software

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Why?

How many errors are our users seeing?

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Why?

Is our App fast enough?

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Why?

Were our assumptions about performance/usage patterns

proven correct?

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The Metrics library

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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/

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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

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REST requests

Timer

What to Measure?At yammer they can have up to 40/50 metrics per service

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MySQL/couchdb/Solr queries

Timer

What to Measure?At yammer they can have up to 40/50 metrics per service

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Calls to external services/processes

Timer

What to Measure?At yammer they can have up to 40/50 metrics per service

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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

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ERRORS!

Counter / Meter

What to Measure?At yammer they can have up to 40/50 metrics per service

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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!

@jnelasjoao.nelas@gmail.com

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