Admission control is the system in CockroachDB that prioritizes work during different types of node overload. In a properly sized cluster, where the work does not exceed the resource capacity, all work proceeds uninterrupted and effectively receives equal priority.

Jon St. John

May 14, 2024

Achieving low latency reads in a transactionally consistent, multi-region database is a unique challenge. In CockroachDB, two approaches are frequently used: geo-partitioning data so that it is located in the region where it is accessed most frequently, and historical reads, which read slightly stale data from local replicas. However, there is a third approach that is used less frequently because it fits a narrower use case: global tables. Global tables offer low-latency non-stale reads from all regions at the cost of higher write latency, and they can be used in many cases where the workload has a high read to write ratio.

Jon St. John

November 8, 2022