watcher/reactivity mechanism and abilities

[wey-gu]

Is your feature request related to a problem? Please describe.

Pattern to allow the database to push/notify changes being subscribed is becoming more and more popular as it's simplifying app dev in a good way.

Databases like firebase and middleware tools like https://debezium.io are offering such abilities.

These requirements are being requested/queried for some time.

Describe the solution you'd like

Provide interfaces to allow subscriptions on a certain scope of graph data changes.

Underlying it could be listener-based.

The notification layer could be https://debezium.io or equivalent.

Describe alternatives you've considered

Additional context

[wey-gu]

@MuYiYong this is the requirement on pubsub /data watch and notify/ event-driven capability :)

[rendawudi]

is there any progress on this？

[wey-gu]

is there any progress on this？

As I recall, @zhaojunnana is working on a CDC for NebulaGraph :D Any exciting plan/progress could be shared, please?