Cassandra cache

This section describes details relative to the Cassandra-based implementation of the Cassandra cache used for connection tracking and NAT mappings.

Client library and normal operation

Cassandra operations are now asynchronous, so losing connectivity to Cassandra should not impact simulations.

The loss of connectivity to a majority of nodes creates a risk that connections will break on vport migration or MidoNet restart. But this is a low risk if the operator can avoid vport migrations and MidoNet Agent restarts until Cassandra is returned to normal operation.

To summarize, MidoNet can function with Cassandra down (but vport migrations and agent restarts may break connections) so it should only be tolerated for very brief periods.

Questions? Discuss on Mailing Lists or Chat.
Found an error? Report a bug.


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