First Created: 2021/01/23 13:37
Uber
https://eng.uber.com/real-time-push-platform/
Cassandra is a durable and cross region replicated storage.
ZooKeeper is a very powerful system with centralized sharing for distributed synchronization and configuration management. it can detect failures of connected nodes quickly.
Offset mapping algorithm
Multiple regional cuslters replicated messages to multiple aggregate clusters.
原文：https://www.cnblogs.com/wangby511/p/14319979.html