@Override
  public ByteBuffer processStorageCommand(String key, byte[] value, int flags, Cache cache) {
    Region<Object, ValueWrapper> r = getMemcachedRegion(cache);
    r.put(key, ValueWrapper.getWrappedValue(value, flags));
    return asciiCharset.encode(Reply.STORED.toString());
  }
general format of the command is: <code>
&lt;command name&gt; &lt;key&gt; &lt;flags&gt; &lt;exptime&gt; &lt;bytes&gt; [noreply]\r\n
</code><br>

"set" means "store this data".
geode-memcached/src/main/java/org/apache/geode/internal/memcached/commands/SetCommand.java