[ceph-users] MDS damaged after mimic 13.2.1 to 13.2.2 upgrade

Sergey Malinin hell at newmail.com
Mon Oct 8 02:43:43 PDT 2018



> On 8.10.2018, at 12:37, Yan, Zheng <ukernel at gmail.com> wrote:
> 
> On Mon, Oct 8, 2018 at 4:37 PM Sergey Malinin <hell at newmail.com> wrote:
>> 
>> What additional steps need to be taken in order to (try to) regain access to the fs providing that I backed up metadata pool, created alternate metadata pool and ran scan_extents, scan_links, scan_inodes, and somewhat recursive scrub.
>> After that I only mounted the fs read-only to backup the data.
>> Would anything even work if I had mds journal and purge queue truncated?
>> 
> 
> did you backed up whole metadata pool?  did you make any modification
> to the original metadata pool? If you did, what modifications?

I backed up both journal and purge queue and used cephfs-journal-tool to recover dentries, then reset journal and purge queue on original metadata pool.
Before proceeding to alternate metadata pool recovery I was able to start MDS but it soon failed throwing lots of 'loaded dup inode' errors, not sure if that involved changing anything in the pool.
I have left the original metadata pool untouched sine then.


> 
> Yan, Zheng
> 
>> 
>>> On 8.10.2018, at 05:15, Yan, Zheng <ukernel at gmail.com> wrote:
>>> 
>>> Sorry. this is caused wrong backport. downgrading mds to 13.2.1 and
>>> marking mds repaird can resolve this.
>>> 
>>> Yan, Zheng
>>> On Sat, Oct 6, 2018 at 8:26 AM Sergey Malinin <hell at newmail.com> wrote:
>>>> 
>>>> Update:
>>>> I discovered http://tracker.ceph.com/issues/24236 and https://github.com/ceph/ceph/pull/22146
>>>> Make sure that it is not relevant in your case before proceeding to operations that modify on-disk data.
>>>> 
>>>> 
>>>> On 6.10.2018, at 03:17, Sergey Malinin <hell at newmail.com> wrote:
>>>> 
>>>> I ended up rescanning the entire fs using alternate metadata pool approach as in http://docs.ceph.com/docs/mimic/cephfs/disaster-recovery/
>>>> The process has not competed yet because during the recovery our cluster encountered another problem with OSDs that I got fixed yesterday (thanks to Igor Fedotov @ SUSE).
>>>> The first stage (scan_extents) completed in 84 hours (120M objects in data pool on 8 hdd OSDs on 4 hosts). The second (scan_inodes) was interrupted by OSDs failure so I have no timing stats but it seems to be runing 2-3 times faster than extents scan.
>>>> As to root cause -- in my case I recall that during upgrade I had forgotten to restart 3 OSDs, one of which was holding metadata pool contents, before restarting MDS daemons and that seemed to had an impact on MDS journal corruption, because when I restarted those OSDs, MDS was able to start up but soon failed throwing lots of 'loaded dup inode' errors.
>>>> 
>>>> 
>>>> On 6.10.2018, at 00:41, Alfredo Daniel Rezinovsky <alfrenovsky at gmail.com> wrote:
>>>> 
>>>> Same problem...
>>>> 
>>>> # cephfs-journal-tool --journal=purge_queue journal inspect
>>>> 2018-10-05 18:37:10.704 7f01f60a9bc0 -1 Missing object 500.0000016c
>>>> Overall journal integrity: DAMAGED
>>>> Objects missing:
>>>> 0x16c
>>>> Corrupt regions:
>>>> 0x5b000000-ffffffffffffffff
>>>> 
>>>> Just after upgrade to 13.2.2
>>>> 
>>>> Did you fixed it?
>>>> 
>>>> 
>>>> On 26/09/18 13:05, Sergey Malinin wrote:
>>>> 
>>>> Hello,
>>>> Followed standard upgrade procedure to upgrade from 13.2.1 to 13.2.2.
>>>> After upgrade MDS cluster is down, mds rank 0 and purge_queue journal are damaged. Resetting purge_queue does not seem to work well as journal still appears to be damaged.
>>>> Can anybody help?
>>>> 
>>>> mds log:
>>>> 
>>>> -789> 2018-09-26 18:42:32.527 7f70f78b1700  1 mds.mds2 Updating MDS map to version 586 from mon.2
>>>> -788> 2018-09-26 18:42:32.527 7f70f78b1700  1 mds.0.583 handle_mds_map i am now mds.0.583
>>>> -787> 2018-09-26 18:42:32.527 7f70f78b1700  1 mds.0.583 handle_mds_map state change up:rejoin --> up:active
>>>> -786> 2018-09-26 18:42:32.527 7f70f78b1700  1 mds.0.583 recovery_done -- successful recovery!
>>>> <skip>
>>>>  -38> 2018-09-26 18:42:32.707 7f70f28a7700 -1 mds.0.purge_queue _consume: Decode error at read_pos=0x322ec6636
>>>>  -37> 2018-09-26 18:42:32.707 7f70f28a7700  5 mds.beacon.mds2 set_want_state: up:active -> down:damaged
>>>>  -36> 2018-09-26 18:42:32.707 7f70f28a7700  5 mds.beacon.mds2 _send down:damaged seq 137
>>>>  -35> 2018-09-26 18:42:32.707 7f70f28a7700 10 monclient: _send_mon_message to mon.ceph3 at mon:6789/0
>>>>  -34> 2018-09-26 18:42:32.707 7f70f28a7700  1 -- mds:6800/e4cc09cf --> mon:6789/0 -- mdsbeacon(14c72/mds2 down:damaged seq 137 v24a) v7 -- 0x563b321ad480 con 0
>>>> <skip>
>>>>   -3> 2018-09-26 18:42:32.743 7f70f98b5700  5 -- mds:6800/3838577103 >> mon:6789/0 conn(0x563b3213e000 :-1 s=STATE_OPEN_MESSAGE_READ_FOOTER_AND_DISPATCH pgs=8 cs=1 l=1). rx mon.2 seq 29 0x563b321ab880 mdsbeaco
>>>> n(85106/mds2 down:damaged seq 311 v587) v7
>>>>   -2> 2018-09-26 18:42:32.743 7f70f98b5700  1 -- mds:6800/3838577103 <== mon.2 mon:6789/0 29 ==== mdsbeacon(85106/mds2 down:damaged seq 311 v587) v7 ==== 129+0+0 (3296573291 0 0) 0x563b321ab880 con 0x563b3213e
>>>> 000
>>>>   -1> 2018-09-26 18:42:32.743 7f70f98b5700  5 mds.beacon.mds2 handle_mds_beacon down:damaged seq 311 rtt 0.038261
>>>>    0> 2018-09-26 18:42:32.743 7f70f28a7700  1 mds.mds2 respawn!
>>>> 
>>>> # cephfs-journal-tool --journal=purge_queue journal inspect
>>>> Overall journal integrity: DAMAGED
>>>> Corrupt regions:
>>>> 0x322ec65d9-ffffffffffffffff
>>>> 
>>>> # cephfs-journal-tool --journal=purge_queue journal reset
>>>> old journal was 13470819801~8463
>>>> new journal start will be 13472104448 (1276184 bytes past old end)
>>>> writing journal head
>>>> done
>>>> 
>>>> # cephfs-journal-tool --journal=purge_queue journal inspect
>>>> 2018-09-26 19:00:52.848 7f3f9fa50bc0 -1 Missing object 500.00000c8c
>>>> Overall journal integrity: DAMAGED
>>>> Objects missing:
>>>> 0xc8c
>>>> Corrupt regions:
>>>> 0x323000000-ffffffffffffffff
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>>>> 
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