Using pipelines

In the recipe Understanding Redis protocol in Chapter 1,Getting Started with Redis we learned that Redis Clients and servers communicate via the RESP protocol. A typical communication process between the client and the server can be viewed as the following:

1. The client sends a command to the server
2. The server receives the command and puts it in the execution queue (as Redis is a single-threaded execution model)
3. The command gets executed
4. The server returns the execution result to the client

The entire time of this process is termed as round-trip time (RTT). As we can see, the time for step 2 and step 3 depends on the Redis Server, while the time for step 1 and step 4 totally depends on the network latency between the client and the server. If we need to execute multiple commands, network transmission might take a great amount of time, in comparison with the command execution time on the server, which is often very short.

The process can be expedited by using the Redis pipeline. The...