title: Create Lettuce StatefulRedisConnection for storing string as keys and byte array as value
body: <p>I have a Spring boot application which connects to a Redis cluster on AWS. I was trying out Lettuce, and want to create a <code>StatefulRedisConnection</code> for storing keys as string, but values as byte array. I tried using the built-in <code>ByteArrayCodec</code>, but it takes both the key and value as a byte array.</p>
  
  <p>I'm new to Lettuce, so I'm not sure whether I need to write a custom codec. If so, how would I write it? And would there be any performance issues? Or am I going down the wrong path?</p>