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Anyone to help me with this?

Ages ago I did write a blog post: https://www.splunk.com/en_us/blog/it/effectively-once-semantics-in-apache-pulsar.html And slides: https://www.slideshare.net/merlimat/effectivelyonce-semantics-in-apache-pulsar

Exactly what I was looking for thank you. This clarifies a few of the questions I had.