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Gcounter

Grow-only crdt counter with distributed Elixir

Running

Running nodes

Run these commands on 3 different windows to simulate distributed nodes

make start_node target NAME=charlie target ID=2

make start_node target NAME=bob target ID=1

make start_node target NAME=alice target ID=0

NAME - Erlang Name of the node.

ID - ID of the node, used in the crdt state

Functions

In the iex shell of each node, we can execute following functions

Gcounter.Counter.increment - This will increment the distributed counter by 1.

Gcounter.Counter.value - Will return the current counter value

OUTPUT - We can call increment on different nodes and see that value returns same counter value eventually, with no centralized storage. Our grow-only crdt will merge correctly all the increments from different nodes.

Reference

http://jtfmumm.com/blog/2015/11/17/crdt-primer-1-defanging-order-theory/

Things we can improve

  • Adding and removal of nodes dynamically within a network
  • Implement actual gossip protocol for inter-node communications