Software Instability

Software Instability Renato Lucindo @rlucindo -- lucindo.github.com FFFFUUUU Conf 2010 -- ffffuuuu.me

What kind of software? Web Applications Kinda Big Distributed Systems

Production-ready Software works stable maintainable documented scalable

Real life Production Software it runs

Anatomy of a Real life Software focus on features poor logs no administrative tools no information poorly tested

Why? Feature centric "What're the odds of that happening?" Deadlines ReReReReReReprioritization Over confidence Inexperience Naiveness Over excitement

The Clients... Product Owner? Manager? Stakeholder? Who will deal with your mess? OPERATIONS

Building and Running a System

What to do?

Non-functional Requirements decent logs with context (user, host, operation, ...) automatic reload (configs, templates, ...) administrative tools plenty of it counters and statistics charts operations requirements

Tests that matter Fully automated functional test No mocks Log replay High concurrency test Bullet-proof tests The -STOP test Load test (iozone, gcc test) Kill test

How to add a new feature On/Off switch Tests with different versions Full system functional tests Upgrade test Downgrade (rollback) test

Architecture 101 Cache Queue Partition

Stability Patterns Use Timeouts Circuit Breaker Bulkheads Steady State Fail Fast Handshaking Test Harness Decoupling Middleware

Use your head!

What to expect

CAP Theorem

Failures Hardware failure Network failure Electricity Natural disasters Code failure

Human Errors

Your cluelessness

http://ffffuuuu.me	530
http://blog.ferraz.info	145
http://blog.lucindo.com.br	99
http://gandralf.wordpress.com	26
http://gandralf.com	14
http://www.locawebers.com.br	12
http://irr.posterous.com	6
http://bis.cat	2
http://translate.googleusercontent.com	2
http://benap.com	1
http://96.126.126.83	1
http://webcache.googleusercontent.com	1
http://lanyrd.com	1
http://www.ffffuuuu.me	1

Software Instability

by Renato Lucindo on Nov 21, 2010

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Software Instability — Presentation Transcript