DataclassOwnersManager

Exact same issue here - I've also just updated to Mojave. Same process running on my wifes account (even though she's logged off), we also have two accounts - but it still runs whilst i'm logged in. It's causing my macbook pro to run about ~20 degrees hotter than usual. Never seen this process before, but I am able to kill it. Nothing really coming up on a quick Google search.

Sorry for the lack of details. Yes, I used Activity Monitor to Force Quit it. I even logged in to the other account, started some software I thought might be the culprit (Citrix Viewer, Citrix Receiver), logged out and back in to my primary account. I also restarted the computer and reset the VRAM. So far, it hasn't returned.

Also, for good measure, I submitted a description of what was going on to Apple.com/feedback/. I wasn't thinking and submitted it under Macbook Pro (should have probably chosen MacOS), but hopefully, if it's a bug, they'll get it to the right folks. I also sent them a link to this thread, so if it is an ongoing issue, perhaps others on here can make further comments and help Apple narrow down whatever it is.

I’ll keep an eye on the processes over the nest few days, I guess. Would still love to know what that process is, though!

Same issue here since the Mojave update. Might be worth a bug report to Apple. Fans are running constantly, laptop is hot, and dataclassownersmanager is using 50-70% of the CPU.

Did you manage to:

A) successfully kill the task, and

B) If so, has it come back?

It hasn’t come back, yet, for me.