Now comes the fun stuff in my GraphQL series–we'll use subscriptions to display changes to our bookstore in real-time. In Part 6, we'll implement subscriptions on the server using Apollo PubSub.<p>However, the default implementation of PubSub doesn't scale. More robust implementations are available, but not documented well. We'll create a pub/sub mechanism using Redis to distribute published messages over multiple servers.<p>I'll be releasing one part a day for the next week (in case you'd like some holiday travel reading). Here's what you can look forward to.<p>Part 7: Subscriptions (client implementation)<p>With only one part left in the series, I’d love to get your questions and comments.