The commits below came after v12.2.2 and may impact this issue. When a
pg is active+clean+inconsistent means that scrub has detected issues
with 1 or more replicas of 1 or more objects . An unfound object is a
potentially temporary state in which the current set of available OSDs
doesn't allow an object to be recovered/backfilled/repaired. When the
primary OSD restarts, any unfound objects ( an in memory structure) are
reset so that the new set of peered OSDs can determine again what
objects are unfound.
I'm not clear in this scenario whether recovery failed to start,
recovery hung before due to a bug or if recovery stopped (as designed)
because of the unfound object. The new recovery_unfound and
backfill_unfound states indicates that recovery has stopped due to
unfound objects.
commit 64047e1bac2e775a06423a03cfab69b88462538c
Author: David Zafman <dzafman@xxxxxxxxxx>
Date: Wed Jan 10 13:30:41 2018 -0800
osd: Don't start recovery for missing until active pg state set
I was seeing recovery hang when it is started before
_activate_committed()
The state machine passes into "Active" but this transitions to
activating
pg state and after commmitted into "active" pg state.
Signed-off-by: David Zafman <dzafman@xxxxxxxxxx>
commit 7f8b0ce9e681f727d8217e3ed74a1a3355f364f3
Author: David Zafman <dzafman@xxxxxxxxxx>
Date: Mon Oct 9 08:19:21 2017 -0700
osd, mon: Add new pg states recovery_unfound and backfill_unfound
Signed-off-by: David Zafman <dzafman@xxxxxxxxxx>
On 2/16/18 1:40 PM, Gregory Farnum wrote:
On Fri, Feb 16, 2018 at 12:17 PM Graham Allan <gta@xxxxxxx> wrote:
On 02/16/2018 12:31 PM, Graham Allan wrote:
If I set debug rgw=1 and demug ms=1 before running the "object stat"
command, it seems to stall in a loop of trying communicate with osds for
pool 96, which is .rgw.control
10.32.16.93:0/2689814946 --> 10.31.0.68:6818/8969 --
osd_op(unknown.0.0:541 96.e 96:7759931f:::notify.3:head [watch ping
cookie 139709246356176] snapc 0=[] ondisk+write+known_if_redirected
e507695) v8 -- 0x7f10ac033610 con 0
10.32.16.93:0/2689814946 <== osd.38 10.31.0.68:6818/8969 59 ====
osd_op_reply(541 notify.3 [watch ping cookie 139709246356176] v0'0
uv3933745 ondisk = 0) v8 ==== 152+0+0 (2536111836 <(253)%20611-1836> 0
0) 0x7f1158003e20
con 0x7f117afd8390
Prior to that, probably more relevant, this was the only communication
logged with the primary osd of the pg:
10.32.16.93:0/1552085932 --> 10.31.0.71:6838/66301 --
osd_op(unknown.0.0:96 70.438s0
70:1c20c157:::default.325674.85_bellplants_images%2f1042066.jpg:head
[getxattrs,stat] snapc 0=[] ondisk+read+known_if_redirected e507695)
v8 -- 0x7fab79889fa0 con 0
10.32.16.93:0/1552085932 <== osd.175 10.31.0.71:6838/66301 1 ====
osd_backoff(70.438s0 block id 1
[70:1c20c157:::default.325674.85_bellplants_images%2f1042066.jpg:head,70:1c20c157:::default.325674.85_bellplants_images%2f1042066.jpg:head)
e507695) v1 ==== 209+0+0 (1958971312 0 0) 0x7fab5003d3c0 con
0x7fab79885980
210.32.16.93:0/1552085932 --> 10.31.0.71:6838/66301 --
osd_backoff(70.438s0 ack-block id 1
[70:1c20c157:::default.325674.85_bellplants_images%2f1042066.jpg:head,70:1c20c157:::default.325674.85_bellplants_images%2f1042066.jpg:head)
e507695) v1 -- 0x7fab48065420 con 0
so I guess the backoff message above is saying the object is
unavailable. OK, that certainly makes sense. Not sure that it helps me
understand how to fix the inconsistencies....
If I restart the primary osd for the pg, that makes it forget its state
and return to active+clean+inconsistent. I can then download the
previously-unfound objects again, as well as run "radosgw-admin object
stat".
So the interesting bit is probably figuring out why it decides these
objects are unfound, when clearly they aren't.
What would be the best place to enable additional logging to understand
this - perhaps the primary osd?
David, this sounds like one of the bugs where an OSD can mark objects as
inconsistent locally but then doesn't actually trigger recovery on them. Or
it doesn't like any copy but doesn't persist that.
Do any known issues around that apply to 12.2.2?
-Greg
Thanks for all your help,
Graham
--
Graham Allan
Minnesota Supercomputing Institute - gta@xxxxxxx
_______________________________________________
ceph-users mailing list
ceph-users@xxxxxxxxxxxxxx
http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
