[distributed system][design] Real-Time Delivery Architecture at Twitter

• nothing is stable, embrace and deal with it.
• keep it simple.
• LRU for Redis.
• CQRS Always consider separately from read and write design.
• Event-based 'router'
• Fan-out :-) It's been used back in the day Jesus was born :-P ext4 files system/inode, fanout with another indirection.
  Prof. David Wheeler : "All problems in computer science can be solved by another level of indirection" (the "fundamental theorem of software engineering")
• consider about edge cases.
• Technology makes lives, better, keep on!