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Remove Kubernetes References
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djw-m committed Oct 2, 2023
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Expand Up @@ -27,7 +27,7 @@ How [Raft](#raft) makes group-wide decisions. Given a number of nodes in a group

#### Cluster

Generically, a cluster is a group of multiple redundant systems arranged to appear to end users as one system. See also [PGD clusters](#pgd-clusters), [Kubernetes clusters](#kubernetes-clusters) and [Postgres clusters](#postgres-cluster).
Generically, a cluster is a group of multiple redundant systems arranged to appear to end users as one system. See also [PGD clusters](#pgd-clusters) and [Postgres clusters](#postgres-cluster).

#### DDL

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A distributed computing model where all replicas are updated synchronously and simultaneously. This ensures that all reads after a write has completed will see the same value on all nodes. The downside of this approach is its negative impact on performance.

#### Kubernetes clusters

A Kubernetes cluster is a group of machines that work together to run containerized applications. A [PGD Cluster](pgd-cluster) can be configured to run as containerized components on a Kubernetes Cluster.

#### Logical replication

A more efficient method of replicating changes in the database. While physical streaming replication duplicate the originating database’s disk blocks, logical replication instead sees the DML commands - inserts, deletes and updates,- published to all systems that have subscribed to see the changes. Each subscriber then applies the changes locally. Logical replication is not able to support most DDL
Expand All @@ -70,7 +66,7 @@ A more efficient method of replicating changes in the database. While physical s

A general term for an element of a distributed system. A node can play host to any service. In PGD, there are [PGD Nodes](#pgd-node) which run a Postgres database and the BDR extension and optionally a PGD Proxy service.

Typically, for high availability, each node runs on separate physical hardware, but not necessarily. For example, in modern cloud platforms such as Kubermetes the hardware may be shared with the cloud.
Typically, for high availability, each node runs on separate physical hardware, but not necessarily. For example, in modern cloud platforms the hardware may be shared with the cloud.

#### Node groups

Expand All @@ -79,7 +75,7 @@ PGD Nodes in PGD clusters can be organized into groups to reflect the logical op

#### PGD cluster

A group of multiple redundant database systems and proxies arranged to avoid single points of failure while appearing to end users as one system. PGD clusters may be run on Docker instances, [Kubernetes clusters](kubernetes-clusters), cloud instances or “bare” Linux hosts, or a combination of those platforms. A PGD cluster may also include backup and proxy nodes. The data nodes in a cluster are grouped together in a top level group and into various local [node groups](#node-groups).
A group of multiple redundant database systems and proxies arranged to avoid single points of failure while appearing to end users as one system. PGD clusters may be run on Docker instances, cloud instances or “bare” Linux hosts, or a combination of those platforms. A PGD cluster may also include backup and proxy nodes. The data nodes in a cluster are grouped together in a top level group and into various local [node groups](#node-groups).

### PGD node

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