Looking back on “Look Back” videos

What this post added

This post details the engineering challenges and solutions for building the 'Look Back' video feature within a month. It highlights the rapid scaling of infrastructure, including estimating and provisioning 25 petabytes of storage and planning for 187 Gbps of outgoing bandwidth. The post describes the division of the pipeline into parallelizable tasks, the decision to isolate video storage and reduce replication factors, and the provisioning of additional hardware to handle the compute and network load. It also touches on managing data center power efficiency and the collaborative, cross-team effort required to meet the tight deadline.