Joint Cracking Massage

I’ve never had a massage before and want start them. I came across this massage guy who gives these joint cracking/joint releasing massages. His clients say that they find his massages very relaxing.

Isnt joint cracking harmful or am I just being paranoid?
I do have a disc bulge which sometimes leads a sciatic pain.
What would be the best option for me? ART is not available.

I’d also like to try bone/joint cracking massages…I guess that’s what chiropractors do BUT I don’t trsut alternative medicine…