30 Apr
2020
30 Apr
'20
5:52 p.m.
Francois,
With regard to OSD.8 - IMO the root cause is pretty the same -
incomplete large write occurred in buffered mode. But unfortunately it
looks like it happened a while ago and now data at rest are corrupted -
OSD detects that on startup (trying to perform DB compaction) and fails
to start. If this is the only OSD in this state I think it's better
simply redeploy OSD once the cluster is in a healthy state.
As for recovery - I don't have enough expertise to advise anything -
indeed it's better to start a different thread and/or create a ticket
Thanks,
Igor
On 4/30/2020 1:29 PM, Francois Legrand wrote:
> Thanks again for your reactivity and your advices. You saved our lives !
>
> We reactivate recovery/backfilling/rebalancing and it starts the
> recovery. We now have to wait to see how it will evolve.
>
> Last question : We noticed (a few days ago and it still occurs) that
> after ~1h the recovery was stopping (Recovery Throughput drop to 0).
> We could restart it by restarting the ceph-mgr.target on the active
> manager... for another ~1 hour ! It's strange because I cannot see any
> crash or relevant info in the logs !
> Moreover the ceph crash command hangs and no way to get output. Maybe
> it's because of the huge number of failures on the osds !
> Do you think that this two problems could be related to the osd
> crashing ? I will continue to investigate and maybe open a new
> different thread on this topic.
> F.
>
> Le 30/04/2020 à 10:57, Igor Fedotov a écrit :
>> I created the following ticket and PR to track/fix the issue with
>> incomplete large writes when bluefs_buffereed_io=1.
>>
>> https://tracker.ceph.com/issues/45337
>>
>> https://github.com/ceph/ceph/pull/34836
>>
>>
>> But In fact setting bluefs_buffered_io to false is the mainstream for
>> now, see https://github.com/ceph/ceph/pull/34224
>>
>> Francois, you can proceed with OSD.21 &.49 I can reproduce the issue
>> locally hence no much need in them now.
>>
>> Still investigating what's happening with OSD.8...
>>
>> As for reactivating recovery/backfill/rebalancing - I can say for
>> sure whether it's safe or not.
>>
>>
>> Thanks,
>>
>> Igor
>>
>>
>> On 4/30/2020 1:39 AM, Francois Legrand wrote:
>>> Hello,
>>> We set bluefs_buffered_io to false for the whole cluster except 2
>>> osd (21 and 49) for which we decided to keep the value to true for
>>> future experiments/troubleshooting as you asked.
>>> We then restarted all the 25 downs osd and they started... except
>>> one (number 8) which still continue to crash with the same kind of
>>> errors.
>>> I tryed a fsck on this osd which ended by a success. I set the debug
>>> to 20 and recorded the logs.
>>> You will find the logs there if you want to have a look :
>>> https://we.tl/t-GDvvvi2Gmm
>>> Now we plan to reactivate the recovery, backfill and rebalancing if
>>> you think it's safe.
>>> F.
>>>
>>> Le 29/04/2020 à 16:45, Igor Fedotov a écrit :
>>>> So the crash seems to be caused by the same issue - big (and
>>>> presumably incomplete) write and subsequent read failure.
>>>>
>>>> I've managed to repro this locally. So bluefs_buffered_io seems to
>>>> be a remedy for now.
>>>>
>>>> But additionally I can observe multiple slow ops indications in
>>>> this new log and I think they cause those big writes.
>>>>
>>>> And I presume some RGW-triggered ops are in flight - bucket
>>>> resharding or removal or something..
>>>>
>>>> I've seen multiple reports about this stuff causing OSD slowdown,
>>>> high memory utilization and finally huge reads and/or writes from
>>>> RocksDB.
>>>>
>>>> Don't know how to deal with this at the moment...
>>>>
>>>> Thanks,
>>>>
>>>> Igor
>>>>
>>>>
>>>> On 4/29/2020 5:33 PM, Francois Legrand wrote:
>>>>> Here are the logs of the newly crashed osd.
>>>>> F.
>>>>>
>>>>> Le 29/04/2020 à 16:21, Igor Fedotov a écrit :
>>>>>> Sounds interesting - could you please share the crash log for
>>>>>> these new OSDs? They presumably suffer from another issue. At
>>>>>> least that first crash is caused by something else.
>>>>>>
>>>>>>
>>>>>> "bluefs buffered io" can be injected on the fly but I
expect it
>>>>>> to help when OSD isn't starting up only.
>>>>>>
>>>>>>
>>>>>> On 4/29/2020 5:17 PM, Francois Legrand wrote:
>>>>>>> Ok we will try that.
>>>>>>> Indeed, restarting osd.5 triggered the falling down of two
other
>>>>>>> osds in the cluster.
>>>>>>> Thus we will set bluefs buffered io = false for all osds and
>>>>>>> force bluefs buffered io = true for one of the downs osds.
>>>>>>> Is that modification needs to use injectargs or changing it
in
>>>>>>> the configuration is enougth to have it applied on the fly ?
>>>>>>> F.
>>>>>>>
>>>>>>> Le 29/04/2020 à 15:56, Igor Fedotov a écrit :
>>>>>>>> That's bluefs buffered io = false which did the
trick.
>>>>>>>>
>>>>>>>> It modified write path and this presumably has fixed
large
>>>>>>>> write(s).
>>>>>>>>
>>>>>>>> Trying to reproduce locally but please preserve at least
one
>>>>>>>> failing OSD (i.e. do not start it with the disabled
buffered
>>>>>>>> io) for future experiments/troubleshooting for a while if
>>>>>>>> possible.
>>>>>>>>
>>>>>>>>
>>>>>>>> Thanks,
>>>>>>>>
>>>>>>>> Igor
>>>>>>>>
>>>>>>>>
>>>>>>>>
>>>>>>>> On 4/29/2020 4:50 PM, Francois Legrand wrote:
>>>>>>>>> Hi,
>>>>>>>>> It seems much better with theses options. The osd is
now up
>>>>>>>>> since 10mn without crashing (before it was rebooting
after ~1mn).
>>>>>>>>> F.
>>>>>>>>>
>>>>>>>>> Le 29/04/2020 à 15:16, Igor Fedotov a écrit :
>>>>>>>>>> Hi Francois,
>>>>>>>>>>
>>>>>>>>>> I'll write a more thorough response a bit
later.
>>>>>>>>>>
>>>>>>>>>> Meanwhile could you please try OSD startup with
the following
>>>>>>>>>> settings now:
>>>>>>>>>>
>>>>>>>>>> debug-bluefs abd debug-bdev = 20
>>>>>>>>>>
>>>>>>>>>> bluefs sync write = false
>>>>>>>>>>
>>>>>>>>>> bluefs buffered io = false
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>> Thanks,
>>>>>>>>>>
>>>>>>>>>> Igor
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>> On 4/29/2020 3:35 PM, Francois Legrand wrote:
>>>>>>>>>>> Hi Igor,
>>>>>>>>>>> Here is what we did :
>>>>>>>>>>> First, as other osd were falling down, we
stopped all
>>>>>>>>>>> operations with
>>>>>>>>>>> ceph osd set norecover
>>>>>>>>>>> ceph osd set norebalance
>>>>>>>>>>> ceph osd set nobackfill
>>>>>>>>>>> ceph osd set pause
>>>>>>>>>>>
>>>>>>>>>>> to avoid other crashs !
>>>>>>>>>>>
>>>>>>>>>>> Then we moved to your recommandations (still
testing on osd 5):
>>>>>>>>>>> in /etc/ceph/ceph.conf we added:
>>>>>>>>>>> [osd.5]
>>>>>>>>>>> debug bluefs = 20
>>>>>>>>>>> debug bdev = 20
>>>>>>>>>>>
>>>>>>>>>>> We ran :
>>>>>>>>>>> ceph-bluestore-tool fsck --path
/var/lib/ceph/osd/ceph-5 -l
>>>>>>>>>>> /var/log/ceph/bluestore-tool-fsck-osd-5.log
--log-level 20 >
>>>>>>>>>>> /var/log/ceph/bluestore-tool-fsck-osd-5.out
2>&1
>>>>>>>>>>>
>>>>>>>>>>> it ended with fsck success
>>>>>>>>>>>
>>>>>>>>>>> It seems that the default value for bluefs
sync write is
>>>>>>>>>>> false
>>>>>>>>>>>
(https://github.com/ceph/ceph/blob/v14.2.8/src/common/options.cc),
>>>>>>>>>>> thus
>>>>>>>>>>> we changed /etc/ceph/ceph.conf to :
>>>>>>>>>>> [osd.5]
>>>>>>>>>>> debug bluefs = 20
>>>>>>>>>>> debug bdev = 20
>>>>>>>>>>> bluefs sync write = true
>>>>>>>>>>>
>>>>>>>>>>> and restarted the osd. It crashed !
>>>>>>>>>>> We tryed to change explicitely bluefs sync
write = false and
>>>>>>>>>>> restarted... same result !
>>>>>>>>>>>
>>>>>>>>>>> The logs are here :
https://we.tl/t-HMiFDu22XH
>>>>>>>>>>>
>>>>>>>>>>> Moreover, we have a rados gateway pool with
hundreds of 4GB
>>>>>>>>>>> files. Can this be the origin of the problem
?
>>>>>>>>>>> Do you thing that removing this pool can help
?
>>>>>>>>>>>
>>>>>>>>>>> Thanks again for your expertise.
>>>>>>>>>>> F.
>>>>>>>>>>>
>>>>>>>>>>>
>>>>>>>>>>> Le 28/04/2020 à 18:52, Igor Fedotov a
écrit :
>>>>>>>>>>>> Short update - please treat
bluefs_sync_write parameter
>>>>>>>>>>>> instead of bdev-aio. Changing the latter
isn't supported in
>>>>>>>>>>>> fact.
>>>>>>>>>>>>
>>>>>>>>>>>> On 4/28/2020 7:35 PM, Igor Fedotov
wrote:
>>>>>>>>>>>>> Francious,
>>>>>>>>>>>>>
>>>>>>>>>>>>> here are some observations got from
your log.
>>>>>>>>>>>>>
>>>>>>>>>>>>> 1) Rocksdb reports error on the
following .sst file:
>>>>>>>>>>>>>
>>>>>>>>>>>>> -35> 2020-04-28 15:23:47.612
7f4856e82a80 -1 rocksdb:
>>>>>>>>>>>>> Corruption: Bad table magic number:
expected 986351839
>>>>>>>>>>>>> 0377041911, found
12950032858166034944 in db/068269.sst
>>>>>>>>>>>>>
>>>>>>>>>>>>> 2) which relates to BlueFS ino
53361:
>>>>>>>>>>>>>
>>>>>>>>>>>>> -50> 2020-04-28 15:23:45.103
7f4856e82a80 10 bluefs
>>>>>>>>>>>>> open_for_read db/068269.sst (random)
>>>>>>>>>>>>> -49> 2020-04-28 15:23:45.103
7f4856e82a80 10 bluefs
>>>>>>>>>>>>> open_for_read h 0x557914fb80b0 on
file(ino 53361 size 0x
>>>>>>>>>>>>> c496f919 mtime 2020-04-28
15:23:39.827515 bdev 1 allocated
>>>>>>>>>>>>> c4970000 extents
[1:0x383db280000~c4970000])
>>>>>>>>>>>>>
>>>>>>>>>>>>> 3) and failed read happens to the end
(0xc496f8e4~35, last
>>>>>>>>>>>>> 0x35 bytes) of this huge(3+GB) file:
>>>>>>>>>>>>>
>>>>>>>>>>>>> -44> 2020-04-28 15:23:47.514
7f4856e82a80 10 bluefs
>>>>>>>>>>>>> _read_random h 0x557914fb80b0
0xc496f8e4~35 from file(in
>>>>>>>>>>>>> o 53361 size 0xc496f919 mtime
2020-04-28 15:23:39.827515
>>>>>>>>>>>>> bdev 1 allocated c4970000 extents
[1:0x383db280000~c49
>>>>>>>>>>>>> 70000])
>>>>>>>>>>>>> -43> 2020-04-28 15:23:47.514
7f4856e82a80 20 bluefs
>>>>>>>>>>>>> _read_random left 0x71c
0xc496f8e4~35
>>>>>>>>>>>>> -42> 2020-04-28 15:23:47.514
7f4856e82a80 20 bluefs
>>>>>>>>>>>>> _read_random got 53
>>>>>>>>>>>>>
>>>>>>>>>>>>> 4) This .sst file was created from
scratch shortly before
>>>>>>>>>>>>> with a single-shot 3+GB write:
>>>>>>>>>>>>>
>>>>>>>>>>>>> -88> 2020-04-28 15:23:35.661
7f4856e82a80 10 bluefs
>>>>>>>>>>>>> open_for_write db/068269.sst
>>>>>>>>>>>>> -87> 2020-04-28 15:23:35.661
7f4856e82a80 20 bluefs
>>>>>>>>>>>>> open_for_write mapping db/068269.sst
to bdev 1
>>>>>>>>>>>>> -86> 2020-04-28 15:23:35.662
7f4856e82a80 10 bluefs
>>>>>>>>>>>>> open_for_write h 0x5579145e7a40 on
file(ino 53361 size 0
>>>>>>>>>>>>> x0 mtime 2020-04-28 15:23:35.663142
bdev 1 allocated 0
>>>>>>>>>>>>> extents [])
>>>>>>>>>>>>> -85> 2020-04-28 15:23:39.826
7f4856e82a80 10 bluefs
>>>>>>>>>>>>> _flush 0x5579145e7a40 0x0~c496f919 to
file(ino 53361 siz
>>>>>>>>>>>>> e 0x0 mtime 2020-04-28
15:23:35.663142 bdev 1 allocated 0
>>>>>>>>>>>>> extents [])
>>>>>>>>>>>>>
>>>>>>>>>>>>> 5) Presumably RocksDB creates this
file in an attempt to
>>>>>>>>>>>>> recover/compact/process another
existing file (ino 52405)
>>>>>>>>>>>>> which is pretty large as well
>>>>>>>>>>>>>
>>>>>>>>>>>>> Please find multiple earlier reads,
the last one:
>>>>>>>>>>>>>
>>>>>>>>>>>>> -92> 2020-04-28 15:23:29.857
7f4856e82a80 10 bluefs
>>>>>>>>>>>>> _read h 0x5579147286e0
0xc6788000~8000 from file(ino 524
>>>>>>>>>>>>> 05 size 0xc67888a0 mtime 2020-04-25
13:34:55.325699 bdev 0
>>>>>>>>>>>>> allocated c6790000 extents
[1:0x381c8220000~10000,1:
>>>>>>>>>>>>>
>>>>>>>>>>>>> The rationales for binding these two
files are pretty
>>>>>>>>>>>>> uncommon file sizes.
>>>>>>>>>>>>>
>>>>>>>>>>>>>
>>>>>>>>>>>>> So you have 3+GB single-shot BlueFS
write and immediate
>>>>>>>>>>>>> read from the end of the written
extent which returns
>>>>>>>>>>>>> unexpected magic.
>>>>>>>>>>>>>
>>>>>>>>>>>>> It's well known in the software
world that large (2+GB)
>>>>>>>>>>>>> data processing implementations tend
to be error-prone.
>>>>>>>>>>>>> And Ceph is not an exception. Here is
a couple of recent
>>>>>>>>>>>>> examples which are pretty close to
your case:
>>>>>>>>>>>>>
>>>>>>>>>>>>>
https://github.com/ceph/ceph/commit/4d33114a40d5ae0d541c36175977ca22789a3b88
>>>>>>>>>>>>>
>>>>>>>>>>>>>
>>>>>>>>>>>>>
https://github.com/ceph/ceph/commit/207806abaa91259d9bb726c2555e7e21ac541527
>>>>>>>>>>>>>
>>>>>>>>>>>>>
>>>>>>>>>>>>> Although they are already fixed in
Nautilus 14.2.8 there
>>>>>>>>>>>>> might be others present along the
write path (including
>>>>>>>>>>>>> H/W firmware).
>>>>>>>>>>>>>
>>>>>>>>>>>>> The good news are that failure
happens on a newly written
>>>>>>>>>>>>> file (remember invalid magic is read
at the end(!) of this
>>>>>>>>>>>>> new large file shortly(!) after the
write). So looks like
>>>>>>>>>>>>> data hasn't yet landed to a disk.
And hopefully original
>>>>>>>>>>>>> data are untouched.
>>>>>>>>>>>>>
>>>>>>>>>>>>> You can try to run
ceph-bluestore-tool's fsck command on
>>>>>>>>>>>>> the broken OSD. This will open DB in
read-only and
>>>>>>>>>>>>> hopefully proves the idea that the
issue is on the write
>>>>>>>>>>>>> path rather than already corrupted
data.
>>>>>>>>>>>>>
>>>>>>>>>>>>> Also you might want to set bdev-aio
to false (or true if
>>>>>>>>>>>>> it's already at false) and try
OSD startup once more -
>>>>>>>>>>>>> this will go via a bit different
write path and may be
>>>>>>>>>>>>> provide a workaround.
>>>>>>>>>>>>>
>>>>>>>>>>>>> Also please collect debug logs for
OSD startup (with both
>>>>>>>>>>>>> current and updated bdev-aio
parameter) and
>>>>>>>>>>>>> --debug-bdev/debug-bluefs set to 20.
You can omit
>>>>>>>>>>>>> --debug-bluestore increase for now to
reduce log size.
>>>>>>>>>>>>>
>>>>>>>>>>>>>
>>>>>>>>>>>>> Thanks,
>>>>>>>>>>>>>
>>>>>>>>>>>>> Igor
>>>>>>>>>>>>>
>>>>>>>>>>>>>
>>>>>>>>>>>>> On 4/28/2020 5:16 PM, Francois
Legrand wrote:
>>>>>>>>>>>>>> Here is the output of
ceph-bluestore-tool bluefs-bdev-sizes
>>>>>>>>>>>>>> inferring bluefs devices from
bluestore path
>>>>>>>>>>>>>> slot 1
/var/lib/ceph/osd/ceph-5/block -> /dev/dm-17
>>>>>>>>>>>>>> 1 : device size 0x746c0000000 :
own
>>>>>>>>>>>>>> 0x[37e1eb00000~4a82900000] =
0x4a82900000 : using
>>>>>>>>>>>>>> 0x5bc780000(23 GiB)
>>>>>>>>>>>>>>
>>>>>>>>>>>>>>
>>>>>>>>>>>>>> the result of the debug-bluestore
(and debug-bluefs) set
>>>>>>>>>>>>>> to 20 for osd.5
>>>>>>>>>>>>>> is at the following address
(28MB).
>>>>>>>>>>>>>>
>>>>>>>>>>>>>>
https://wetransfer.com/downloads/a193ab15ab5e2395fe2462c963507a7f2020042814…
>>>>>>>>>>>>>>
>>>>>>>>>>>>>>
>>>>>>>>>>>>>> Thanks for your help.
>>>>>>>>>>>>>> F.
>>>>>>>>>>>>>>
>>>>>>>>>>>>>> Le 28/04/2020 à 13:33, Igor
Fedotov a écrit :
>>>>>>>>>>>>>>> Hi Francois,
>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>> Could you please share OSD
startup log with
>>>>>>>>>>>>>>> debug-bluestore (and
debug-bluefs) set to 20.
>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>> Also please run
ceph-bluestore-tool's bluefs-bdev-sizes
>>>>>>>>>>>>>>> command and share the
output.
>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>> Thanks,
>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>> Igor
>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>> On 4/28/2020 12:55 AM,
Francois Legrand wrote:
>>>>>>>>>>>>>>>> Hi all,
>>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>>> *** Short version ***
>>>>>>>>>>>>>>>> Is there a way to repair
a rocksdb from errors
>>>>>>>>>>>>>>>> "Encountered error
while reading data from compression
>>>>>>>>>>>>>>>> dictionary block
Corruption: block checksum mismatch"
>>>>>>>>>>>>>>>> and "_open_db
erroring opening db" ?
>>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>>> *** Long version ***
>>>>>>>>>>>>>>>> We operate a nautilus
ceph cluster (with 100 disks of
>>>>>>>>>>>>>>>> 8TB in 6 servers + 4
mons/mgr + 3 mds).
>>>>>>>>>>>>>>>> We recently (Monday 20)
upgraded from 14.2.7 to 14.2.8.
>>>>>>>>>>>>>>>> This triggered a
rebalancing of some data.
>>>>>>>>>>>>>>>> Two days later (Wednesday
22) we had a very short power
>>>>>>>>>>>>>>>> outage. Only one of the
osd servers went down (and
>>>>>>>>>>>>>>>> unfortunately died).
>>>>>>>>>>>>>>>> This triggered a
reconstruction of the losts osds.
>>>>>>>>>>>>>>>> Operations went fine
until Saturday 25 where some osds
>>>>>>>>>>>>>>>> in the 5 remaining
servers started to crash apparently
>>>>>>>>>>>>>>>> with no reasons.
>>>>>>>>>>>>>>>> We tryed to restart them,
but they crashed again. We
>>>>>>>>>>>>>>>> ended with 18 osd down (+
16 in the dead server so 34
>>>>>>>>>>>>>>>> osd downs out of 100).
>>>>>>>>>>>>>>>> Looking at the logs we
found for all the crashed osd :
>>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>>> -237> 2020-04-25
16:32:51.835 7f1f45527a80 3 rocksdb:
>>>>>>>>>>>>>>>>
[table/block_based_table_reader.cc:1117] Encountered
>>>>>>>>>>>>>>>> error while reading data
from compression dictionary
>>>>>>>>>>>>>>>> block Corruption: block
checksum mismatch: expected 0,
>>>>>>>>>>>>>>>> got 2729370997 in
db/181355.sst offset
>>>>>>>>>>>>>>>> 18446744073709551615 size
18446744073709551615
>>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>>> and
>>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>>> 2020-04-25 16:05:47.251
7fcbd1e46a80 -1
>>>>>>>>>>>>>>>>
bluestore(/var/lib/ceph/osd/ceph-3) _open_db erroring
>>>>>>>>>>>>>>>> opening db:
>>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>>> We also noticed that the
"Encountered error while
>>>>>>>>>>>>>>>> reading data from
compression dictionary block
>>>>>>>>>>>>>>>> Corruption: block
checksum mismatch" was present few
>>>>>>>>>>>>>>>> days before the crash.
>>>>>>>>>>>>>>>> We also have some osd
with this error but still up.
>>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>>> We tryed to repair with
:
>>>>>>>>>>>>>>>> ceph-kvstore-tool
bluestore-kv /var/lib/ceph/osd/ceph-3
>>>>>>>>>>>>>>>> repair
>>>>>>>>>>>>>>>> But no success (it ends
with _open_db erroring opening
>>>>>>>>>>>>>>>> db).
>>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>>> Thus does somebody have
an idea to fix this or at least
>>>>>>>>>>>>>>>> know if it's possible
to repair and correct the
>>>>>>>>>>>>>>>> "Encountered error
while reading data from compression
>>>>>>>>>>>>>>>> dictionary block
Corruption: block checksum mismatch"
>>>>>>>>>>>>>>>> and "_open_db
erroring opening db" !
>>>>>>>>>>>>>>>> Thanks for your help (we
are desperate because we will
>>>>>>>>>>>>>>>> loose datas and are
fighting to save something) !!!
>>>>>>>>>>>>>>>> F.
>>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>>>
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>>>>>>>>>>>>>>
>>>>>>>>>>>>>
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>>>>>>>>>>>
>>>>>>>>>
>>>>>>>
>>>>>
>>>
>