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jpe442 committed Feb 4, 2025
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Expand Up @@ -35,7 +35,7 @@ PGD comprises several key architectural elements that work together to provide i

- **PGD nodes**: These are individual Postgres instances that store and manage data. They are the basic building blocks of a PGD cluster.

- **Groups**: By default, all nodes are also members of a top-level group with its own raft leader, but without a write-leader. PGD nodes can be further organized into [subgroups](../node_management/groups_and_subgroups/#sub-groups), which enhance manageability and high availability. Each group can contain multiple nodes, allowing for redundancy and failover within the group. Groups facilitate organized replication and data consistency among nodes within the same group and across different groups. Each group has its own write leader.
- **Groups**: By default, all nodes are also members of a [top-level group](../node_management/groups_and_subgroups/#groups) with its own raft leader, but without a write-leader. PGD nodes can be further organized into [subgroups](../node_management/groups_and_subgroups/#sub-groups), which enhance manageability and high availability. Each group can contain multiple nodes, allowing for redundancy and failover within the group. Groups facilitate organized replication and data consistency among nodes within the same group and across different groups. Each group has its own write leader.

- **Replication mechanisms**: PGD's replication mechanisms include Bi-Directional Replication (BDR) for efficient replication across nodes, enabling multi-master replication. BDR supports asynchronous replication by default, but can be configured for varying levels of synchronicity, such as [Group Commit](../commit-scopes/group-commit) or [Synchronous Commit](../commit-scopes/synchronous_commit), to enhance data durability.

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