February 2020
Intermediate to advanced
734 pages
38h 13m
English
Content preview from PostgreSQL 12 High Availability Cookbook - Third Edition
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How it works...
Just as we did when we created the initial node, we always start by creating the bdr extension itself. This is a prerequisite to making all BDR-related functions available for our use.
Next, we perform the same step as the previous recipe by using bdr.create_node to establish metadata for this node before it joins the cluster. Perhaps it seems silly to create a node with no context for where it belongs since it's not associated with any cluster. The true role of the create_node function is to establish node metadata within BDR and pglogical. This information will be exchanged with any cluster we try to join.
It's also the reason why the node_id value is generated to be unique across the cluster. This ensures that any new node ...
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