We are also running into this issue on one of our clusters -
balancer mode upmap, about 950 OSDs.
Andras
On 12/18/19 4:44 PM, Bryan Stillwell
wrote:
On Dec 18, 2019, at 11:58 AM, Sage Weil <sage@xxxxxxxxxxxx>
wrote:
On Wed, 18 Dec 2019, Bryan Stillwell
wrote:
After upgrading one of our clusters from Nautilus 14.2.2
to Nautilus 14.2.5 I'm seeing 100% CPU usage by a single
ceph-mgr thread (found using 'top -H'). Attaching to the
thread with strace shows a lot of mmap and munmap calls.
Here's the distribution after watching it for a few
minutes:
48.73% - mmap
49.48% - munmap
1.75% - futex
0.05% - madvise
I've upgraded 3 other clusters so far (120 OSDs, 30 OSDs,
200 OSDs), but this is the only one which has seen the
problem (355 OSDs). Perhaps it has something to do with
its size?
I was suspecting it might have to do with one of the
modules misbehaving, so I disabled all of them:
# ceph mgr module ls | jq -r '.enabled_modules'
[]
But that didn't help (I restarted the mgrs after disabling
the modules too).
I also tried setting debug_mgr and debug_mgrc to 20, but
nothing popped out at me as being the cause of the
problem.
It only seems to affect the active mgr. If I stop the
active mgr the problem moves to one of the other mgrs.
Any guesses or tips on what next steps I should take to
figure out what's going on?
What are the balancer modes on the
affected and unaffected cluster(s)?
Affected cluster has a balancer mode of "none".
The other three are "upmap", "none", and "upmap".
I don't know if you saw in ceph-users, but this bug
report seems to point at the finisher-Mgr thread:
Thanks,
Bryan
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