When you need to change a field mapping in Elasticsearch, you’ll quickly discover a limitation: you can’t modify mappings in place. But using aliases and atomic operations on the reindex API, you can make it happen with zero downtime.
Delivering value to customers in realtime often means performing expensive
computations on the fly. As your customer base grows, operations such as
creating a shop, generating invoices, or updating an orderbook can
fan out and grow quickly.
A simple & elegant data structure called a PromiseMap can help ease the
burden to a system under such load.
Patterns that occur in life and nature are often non-linear. From comparing frequencies of notes on a piano to Moore’s Law, logarithms provide a way to measure values extremely far apart from one another. When building tools for society, this can also be a useful property to map nuanced human behavior at scale.