Reconciler
Noun · Development
Definitions
A component that continuously compares desired state with actual state and takes actions to converge them. In React, the reconciler (Fiber) diffs the virtual DOM and schedules DOM updates. In Kubernetes, a reconciler is the control loop inside a controller or operator that watches a resource's spec and drives the cluster toward that declared state.
In plain English: A piece of software that constantly checks 'what should exist?' vs. 'what actually exists?' and fixes any differences.
Example: "The Kubernetes reconciler noticed the deployment spec says 3 replicas but only 2 pods are running, so it's creating a third."