On Thu, Oct 26, 2017 at 11:33 AM Chris Jones <chris.jones@xxxxxx> wrote:
The long running functionality appears to be related to clear_temp_objects(); from OSD.cc called from init().
What is this functionality intended to do? Is it required to be run on every OSD startup? Any configuration settings that would help speed this up?
This function looks like it's cleaning up temporary objects that might have been left behind. Basically, we are scanning through the objects looking for temporaries, but we stop doing so once we hit a non-temp object (implying they are ordered). So in the common case I think we're doing one listing in each PG, finding there are no temp objects (or noting the few that remain), and then advancing to the next PG. This will take a little time as we're basically doing one metadata listing per PG, but that should end quickly.
I'm curious why this is so slow for you as I'm not aware of anybody else reporting such issues. I suspect the ZFS backend is behaving rather differently than the others, or that you've changed the default config options dramatically, so that your OSDs have to do a much larger listing in order to return the sorted list the OSD interface requires.
-Greg
_______________________________________________ ceph-users mailing list ceph-users@xxxxxxxxxxxxxx http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
