Extending OpenStack

Defining cells

The concept of the cell was introduced to add another scalability layer, more specifically on top of Nova services. When designed to scale our compute infrastructure horizontally, this might add more load to the shared infrastructure services, such as message queues and databases. Although the latter common service can be clustered and designed for fault tolerance, performance degradation is still possible. As hundreds of compute nodes submit requests and API calls to message queues and databases, expanding the compute fleet power might result in a bottleneck at this level. To simplify this concept, each compute endpoint will be maintained individually. Each endpoint will be considered as a child cell derived from a parent ...