Latency spikes can be a frustrating reality for many organizations, especially regarding tail percentiles. It’s not uncommon to see unexplained spikes in latency, especially when there’s no deliberate focus on predictability.

Consider a scenario where a web service must render a personalized web page. To provide a good user experience, ensuring low latency for 90% to 95% of requests is necessary. However, the page’s content may require dozens or even hundreds of sub-requests from various components, each with its own variance and randomness. While each component may have low latency in 99% of cases, it might not be enough to guarantee consistent end-user latency. This highlights the importance of having the right Service Layer Objectives (SLOs) for each component to ensure overall system performance.

Leave a Reply

Your email address will not be published. Required fields are marked *