Implementation of Data Replication

This section documents the implementation of data replication in Ozone's block storage layer.

📄️ Write Pipelines

This section documents the implementation of pipelines: groups of datanodes that Ozone uses to write data.

🗃️ Containers

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📄️ SCM Replication Manager

The Replication Manager (RM) is a critical thread which runs inside the leader SCM daemon in an Ozone cluster. Its role is to periodically check the health of each container in the cluster, and take action for any containers which are not optimally replicated. Often that action involves arranging for new replicas of the container to be created, but it can also involve closing the replicas, deleting empty replicas, and so on.