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A cluster mirror is a named, unidirectional replication channel from a remote source cluster to the local destination cluster. It is created by specifying a unique mirror name along with the source cluster's bootstrap servers and security credentials. Once a mirror is created, individual topics on the source cluster can be started, stopped, or paused for replication within it. Each mirror is a first-class entity managed through the Admin API and the kafka-cluster-mirrors.sh CLI tool, with its state persisted in a coordinator that manages cross-cluster replication.
The architecture consists of three main components that work together to provide automatic metadata synchronization and data replication. The following diagram illustrates how these components are wired together. For the sake of clarity, some internal APIs are excluded.
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