[xrd]

Or Firebase?

[Eikon]

Or Kafka ?

[sz4kerto]

Kafka is primarily designed for streaming, pulsar is both for streaming and queueing.

Firebase is a completely different animal.

[manigandham]

Read the other comment thread: https://news.ycombinator.com/item?id=21936523

[qaq]

Scales much better the storage layer is separate from brokers so you can scale things independently.