System architecture diagram

Now that we have discussed different technical considerations in designing a key-value store, we can shift our focus on the architecture diagram

Main features of the architecture are listed as follows:

• Clients communicate with the key-value store through simple APIs: get(key) and put(key, value)

• A coordinator is a node that acts as a proxy between the client and the key-value store.

• Nodes are distributed on a ring using consistent hashing.

• The system is completely decentralized so adding and moving nodes can be automatic. • Data is replicated at multiple nodes.

• There is no single point of failure as every node has the same set of responsibilities.

As the design is decentralized, each node performs many tasks as presented in the picture below