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At ClickHouse, we recently changed the way we orchestrate databases provisioned by customers, specifically the way we use StatefulSets. There was just one big problem: we wanted to migrate our legacy fleet of thousands of services from the old orchestration code-path to the new one without any downtime - even the queries should continue to run as they are.
If there is one thing that people hate doing - it is migrations. They are painful, have lots of corner cases, and take a long time. In our case, it took us almost 6 months to migrate the entire fleet. But we encountered lots of interesting challenges along the way. This talk will walk you through these challenges of live migrating the entire ClickHouse Cloud Fleet's orchestration while continuing to serve customer queries and ingest. The story involves our Operator, deep-dive into StatefulSets, a custom migration controller, durable execution workflows, and many, many database synchronisation challenges.
Manish Gill works at ClickHouse Inc, where he is managing the AutoScaling team for ClickHouse Cloud. He is based out of Berlin and is deeply interested in Databases and Cloud challenges and still considers himself new to Kubernetes. In a past life, he worked in an ML research team... Read More →
Jayme Bird is a Senior Software Engineer at ClickHouse Inc, working on the development of horizontal and vertical autoscaling solutions for ClickHouse Cloud, a stateful analytics DBaaS running on Kubernetes.
