October 2017
Intermediate to advanced
294 pages
8h 17m
English
Content preview from Database Reliability Engineering
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Chapter 4. Operational Visibility
Visibility (often referred to as monitoring) is the cornerstone of the craft of database reliability engineering. Operational visibility means that we have awareness of the working characteristics of a database service due to the regular measuring and collection of data points about the various components. Why is this important? Why do we need operational visibility? Here are just some of the reasons:
- Break/fix and alerting
We need to know when things break, or are about to break, so that we can fix them to avoid violating our Service-Level Objectives (SLOs).
- Performance and behavior analysis
It’s important to understand the latency distribution in our applications, including outliers, and we need to know the trends over time. This data is critical to understanding the impact of new features, experiments, and optimization.
- Capacity planning
Being able to correlate user behavior and application efficiency to real resources (CPU, network, storage, throughput, memory) is critical to ensuring that you never encounter a lack of capacity at a critical business moment.
- Debugging and postmortems
Moving fast means things do break. Good operational visibility gives you the ability to rapidly identify failure points and optimization points to mitigate future risk. Human error is never a root cause, but systems can always be improved upon and made to be more resilient.
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