Smart Data Streaming - Push or Pull technology?

I was trying to understand the similarities and differences between Apache Kafka and SAP HANA Smart Data Streaming. Kafka's topic subscribers, consumers make use of the "pull" methodology to request for messages whenever needed from Kafka's queue - this is done to avoid consumer bottlenecks at the subscriber's end.

What methodology does SAP Smart Data Streaming follow - Push or Pull? I read on a blog that it uses "push"? Is this right? How are consumer bottlenecks prevented in this scenario?