Chapter 27. Built-in High Availability (BiHA)
Table of Contents
- 27.1. Architecture
- 27.2. Setting Up a BiHA Cluster
- 27.2.1. Prerequisites and Considerations
- 27.2.2. Setting Up a BiHA Cluster from Scratch
- 27.2.3. Setting Up a BiHA Cluster from the Existing Cluster with Streaming Replication
- 27.2.4. Setting Up a BiHA Cluster from the Existing Database Server
- 27.2.5. Setting Up the Referee Node in the BiHA Cluster
- 27.2.6. Using the Magic String (Optional)
- 27.2.2. Setting Up a BiHA Cluster from Scratch
- 27.2.1. Prerequisites and Considerations
- 27.3. Administration
- 27.3.1. Changing Cluster Composition
- 27.3.2. Changing Configuration Parameters
- 27.3.3. Switchover
- 27.3.4. Roles
- 27.3.5. Restoring the Node from the
NODE_ERRORState- 27.3.6. Monitoring the Rewind Results
- 27.3.7. Configuration of Synchronous and Asynchronous Replication
- 27.3.8. Logging
- 27.3.9. Callbacks
- 27.3.10. Recovering from a Backup
- 27.3.11. Migration
- 27.3.12. Removing biha
- 27.3.2. Changing Configuration Parameters
- 27.3.1. Changing Cluster Composition
- 27.4. Reference
Built-in High Availability (BiHA) is a complex Postgres Pro Enterprise solution managed by the biha extension and the bihactl utility. Together with a set of core patches, SQL interface, and the biha-background-worker process, which coordinates the cluster nodes, BiHA turns a Postgres Pro cluster into a BiHA cluster — a cluster with physical replication and built-in failover, high availability, and automatic node failure recovery.
As compared to existing cluster solutions, i.e. a standard PostgreSQL primary-standby cluster and a cluster configured with multimaster, the BiHA cluster offers the following benefits:
Physical replication.
Dedicated leader node available for read and write transactions and read-only follower nodes.
Built-in failover including capabilities of automatic node failure detection, response, and subsequent cluster reconfiguration by means of elections.
Referee node to avoid split-brain issues.
Manual switchover.
Autorewind capabilities.
Synchronous and asynchronous node replication.
No additional external cluster software required.