[openstack-dev] [NFV][Telco] New use case - efficient deployment of Cassandra and other NoSQL DBs
Calum.Loudon at metaswitch.com
Thu Oct 22 08:15:12 UTC 2015
I've uploaded a new use case for comment, available at https://review.openstack.org/#/c/238167/. It's to do with the efficient deployment of Cassandra and other NoSQL DBs.
The link to NFV and Telco may seem tenuous, but this is a real issue we are hitting in the field. Telcos are very interested in running geo-redundant services, meaning user data must be geo-redundant. Using scalable open-source N+k NoSQL DBs like Cassandra is a very common solution. They typically provide redundancy at the application level by replicating data between application nodes, actively preferring the underlying storage not to be redundant. They also require the storage attached to different application nodes to have no common points of failure, and (for performance reasons) to place different types of data on different storage pools. Those innocent sounding requirements are trivial to meet in the bare metal world - give your nodes an SSD and an HDD and you're done - but when trying to map to OpenStack it's surprisingly difficult.
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