The views reflected in this talk are not to be considered a reflection of the skills of my coworkers who are extremely nice human beings and way better at capacity planning than I am.
I Rule the Edge! Evaluates weekly global POPs performance & makes projections Publishes capacity performance report in clear location Plans for our physical capacity & transit capacity Meet Catharine
Edge Insights Our ability to correctly plan for capacity is critical to our bottom line Capacity doesn’t just involve hardware; software optimizations matter People affect capacity
Defining Capacity planning Measuring, planning, & managing system growth Determines what your system needs & when From the observation of actual traffic. Use current performance as baseline. Must happen regardless of what you might optimize
ARE WE RIGHT NOW? We have to be this fast & reliable X per second & Y% Uptime MEASURE HOW/RELIABLE WE ARE HARDWARE SOFTWARE ARCHITECTURE CHANGE / ADD / REMOVE FIGURE OUT HOW TO STAY FAST/RELIABLE ENOUGH Yes! No! Allspaw's Wisdom From The Art of Capacity Planning
System’s Ceiling: critical level of a resource that cannot be crossed without failure. Find yours Another form of Capacity Planning: Controlled load testing Predictions: ceilings + historical data Allspaw's Wisdom
Allspaw's Wisdom System architecture can affect your ability to add capacity Identify & track your application’s metrics Tying metrics to user behavior is helpful If you don’t have ways to measure your current capacity you can’t plan
Little’s Law & Capacity planning L = λW Capacity (L), Throughput (λ), and Latency (W) Applies to stable systems Use this information to better understand our workload and to define constraints
Literature Insights Possible to have plenty of capacity and a slow site nonetheless Projections & curve fitting are guesses Keep track of API calls & their rate Always gonna be spikes & hiccups. Take the bad with the good & plan for it
Industry Insights Hard to extrapolate general advice into something applicable for my situation Simplicity & ability to reason are the only things I could trust Confusing community stance on the ROI of capacity planning
Step Four steps followed Start process again Tons of tuning left to do. We know we have suboptimal configs! re-Evaluation Step Three Doubled RAM: our constrained resource Horizontally scaled to 3 servers + 1 canary Capacity expansion
Unexpected Challenges Our goal when adding capacity was no service disruption. Localhost is the goddamn devil Gap from metric/graph to insight can be huge Slowness is the nemesis of distributed system
The Oprah Problem Developing operational insights into non-owned system under pressure is not great Use playbooks, debug.md, rotations, & rollout owners Proactivity and clarity are your best tools Everyone gets more capacity!
Some Insights Anything API driven ought to carry a rate limit - We can easily DDOS ourselves! Monitor and alert on expensive API actions Mind your system dependencies: practice defensive system design & architecture CAPACITY PLANNING ALERTING MONITORING
Some Findings Capacity tied to murky organizational structure is both good & bad (but mostly bad) Mind your error descriptions! Cheeky today ⇒ misleading tomorrow!
Finding my system’s ceiling is still tricky Services owned by engineers means you need to level up on Ops skills Back to re-evaluate setup to get more out of this new capacity Performance testing ought to be done on the core’s side (& edge) My Insights
TL;DR Is a process not a one time event Pushes you to better understand your system, its capacity & its boundaries - that is good! Proactivity is best Capacity planning Request lifecycle gets tricky System boundaries, dependencies & SLAs must be discussed Your system’s capacity may bound other systems capacity Distributed systems
github.com/Randommood/ZerotoCapacityPlanning Special Thanks to: Catharine Strauss, Alan Kasindorf, Matt Whiteley, Caitie McCaffrey, Thom Mahoney, Mike O’Neill, Devon O’Dell, Katherine Daniels, Nathan Taylor, Bruce Spang, and Greg Bako Thank you !
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