If a smart client is not available for your chosen platform, the alternative option is to deploy a standalone proxy, which provides the same functionality as the smart client, while presenting a memcached compatible interface layer locally. A standalone proxy deployed on a client may also be able to provide valuable services, such as connection pooling. The diagram below shows the flow with a standalone proxy installed on the application server.

Figure 4.5. Deployment Strategy — Standalone Proxy

The memcached client is configured to have just one server in its server list (localhost), so all operations are forwarded to localhost:11211 — a port serviced by the proxy. The proxy hashes the document ID to a vBucket, looks up the host server in the vBucket table, and then sends the operation to the appropriate couchbase server on port 11210.