kim.pepper's sandbox: Replica KeyValue Storage

Replica Key Value

This module provides a replica database keyvalue backend.

KeyValue gets will attempt to use the replica database connection if available.
Otherwise, the primary database will be used as normal.

KeyValue sets will trigger the 'replica kill switch' forcing the primary database
to be used for the remainder of the current request.

Setup

Specify the keyvalue factory in your services.yml:

parameters:
  factory.keyvalue:
    default: keyvalue.replica

Configuration

You may wish to adjust the maximum_replication_lag setting from its default of
300 seconds.

$settings['maximum_replication_lag'] = 5;