Describe the architecture with the master and slave database environment cluster. What was it like before MongoDB and what was it like after? o What type of NoSQL database was implemented and how much data was it intended to encompass? Question 2 What was the length of time it took to run the ALTER table query that the speaker referenced when Craigslist was operating in a relational environment? o Why did it take so long? Question 3 Describe some of the hardware failures that Craigslist faced with their datacenter in the relational clustered environment Question 4 What were the lessons learned that Craigslist identified when moving from RDMS to MongoDB? o Explain each one in detail and provide your recommendation on how they might use today's technology (e.g., AWS cloud environment) to assist in some of their lessons learned.