The hub is a distributed linked list.
The hub is a messaging system.
The hub is a long term data store.
The hub is like a Key Value Store
- Stores each item at a unique key (url) (http://hub/channel/whatIs/2016/12/31/23/59/59/bhJ23I)
- Items are available for an arbitrarily long time
- Fault tolerant, easy to cluster
- Requires a quorum for a successful write
with some differences
- Most KV stores allow mutations. The hub does not.
- The hub imposes that all item keys always move forward in time
- The hub offers ordering guarantees to provide consistent answers to time based queries
The hub is like a Messaging system
- Items are immutable
- Item keys always increase
and some differences
- Most messaging systems do not let you access arbitrarily old items
- Many messaging systems are difficult to cluster
- Many messaging system require custom clients