However, we still needed to have detailed enough visibility on the Cassandra internals to ensure we could react to any issues encountered before they became a problem and make appropriate and informed performance tunings. We already use Prometheus for metrics collection, Grafana for visualising its data and Pagerduty as our alerting system. But one thing remains common – we need to have good visibility in order to understand what is going on. We are working in the popular micro services model, where each group has its own Cassandra cluster to ensure resources and problems are isolated.
As all companies, we started small, but during the time our usage grew, complexity increased, and we ended up having over 15 Cassandra clusters with hundreds of nodes, spread across multiple data centers. Outbrain has been using Cassandra for several years now. This blog post describes how we managed to shed some light on our Cassandra clusters, add visibility and share it with the open source community. You love Cassandra, but do you really know what’s going on inside your clusters?
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