2 Plex Media Scanners, each using 100% of a core, for hours and hours, never stopping. And this with no new content added. This started with macOS 10.12 Sierra developer beta 1.
They seem to kick off around 2am. I have daily library updates selected in the server settings. If I manually start an update on one library then the Media Scanner starts and runs at 100% of a core but never terminates, even when the new content is added and the metadata is retrieved.
If I force quit them there seems to be no bad effect and they do not restart.
I understand that beta software can have issues and I don't expect a resolution but think that someone at Plex should know about this.