As mentioned in the example given earlier, although using the Lua object class reduces the complexity to use RADOS object classes, there is a limit to what you can currently achieve. In order to write a class that is capable of performing more advanced processing, we need to fall back to writing the class in C. We will then need to compile the new class into the Ceph source.

To demonstrate this, we will write a new RADOS object class that will calculate the MD5 hash of the specified object and then store it as an attribute of the object. This process will be repeated 1000 times to simulate a busy environment and also to make the runtime easier to measure. We will then compare the operating speed of doing this via the object class versus calculating the MD5 hash on the client. Although this is still a fairly basic task, it will allow us to produce a controlled repeatable scenario and will allow us to compare the speed of completing a task client side versus doing it directly on the OSD via a RADOS class. It will also serve as a good foundation to enable understanding on how to build more advanced applications.