Now you see me, now you don’t: Story of the green online indicator on LinkedIn
Ever wondered how those green online indicators that are so pervasive in every instant messaging application and social network actually work? How do you display them in real-time for the 500 million members on the LinkedIn network? In this talk, I’ll do a technical walk-through of how we used the Play Framework and the Akka Actor Model to build this massive infrastructure that keeps track of the online status of millions of members at any given moment. I’ll describe how it distributes changes in the online status of these members to millions of other connected members in real-time.