Blueprint-nova-cells-loadbalancing

Load balanced cells

Rationale

In some situations the nova-cell process can become a bottle neck and not consume messages from the RPC system fast enough.

Goal

This blueprint sets out to enable multiple 'nova-cell' consumers from a single RPC queue.

It should work all scenarios, for example:

• Global cell

nova-api instances put messages in the queue, multiple nova-cell instances push those messages down to child cells

• Child cell

incoming command messages come from a parent cell into our RPC queue, multiple 'nova-cell' workers consume and process these messages.