The document discusses the technologies used to build a messaging system including Verda IaaS, IMF for operation logging and talk requests, Kotlin and Spring Boot for the backend, and three.js and d3 for frontend rendering. It notes that the real system experiences high event loads of over 1 million per second and stores only coarse-grained user region data at the country level. It also describes using bezier curves to calculate coordinates for connecting dots on a sphere.

1. Globe Infographics
chens, kojilin, tkengo, tony, wats

2. LINE
Dory
server
IMF Cluster
subscribe
events
ws://….
Redis
Store user region and message
meta
Query region and build link

3. What we utilized in company
● Verda
○ In-house IaaS
● IMF(Kafka)
○ Operation Log
■ Can get many event
○ Talk Request
■ Can know user’s region(country level)

4. Library & Language
● Kotlin
○ But didn’t try coroutine
● Spring Boot 2 & WebFlux
● three.js
● d3

5. For the real environment
● Real environment’s IMF events peak number
is high
○ 1,000,000 events/second
○ Query/Aggregate from storage may better?
● User data is coarse grained
○ Region data is country only

6. Calculating Coordinates
● Starting with two dots on sphere
● Connecting dots with a curve
● Finding control points and
animating the bezier curve