Hi Igor,
Just to update you on our progress.
- We've not had another repro of this since switching to bitmap allocator /
upgrading to the latest octopus release. I'll try to gather the full set of
diags if we do see this again.
- I think my issues with an empty /var/lib/ceph/osd/ceph-N/ folder are because
we're running ceph in container which is using a mounted filesystem. As soon as
I stop the OSD, the container terminated and the filesystem disappears. There's
probably a way to decouple the ceph process from the lifetime of the container,
but I've not figured it out yet.
Cheers again for all your help,
Dave
-----Original Message-----
From: Igor Fedotov <ifedo...@suse.de>
Sent: 26 July 2021 13:30
To: Dave Piper <david.pi...@microsoft.com>; ceph-users@ceph.io
Subject: Re: [EXTERNAL] Re: [ceph-users] OSDs flapping with "_open_alloc loaded 132
GiB in 2930776 extents available 113 GiB"
Dave,
please see inline
On 7/26/2021 1:57 PM, Dave Piper wrote:
Hi Igor,
So to get more verbose but less log one can set both debug-bluestore and
debug-bluefs to 1/20. ...
More verbose logging attached. I've trimmed the file to a single restart
attempt to keep the filesize down; let me know if there's not enough here.
Jul 26 10:25:07 condor_sc0 docker[19100]: -9628>
2021-07-26T10:25:05.512+0000 7f9b3ed48f40 20 bluefs _read got 32768 Jul 26
10:25:07 condor_sc0 docker[19100]: -9627>
2021-07-26T10:25:05.512+0000 7f9b3ed48f40 10 bluefs _read h
0x563e8bd3ff80 0xb2d0000~8000 from file(ino 316842 size 0xe6a476e mtime
2021-07-14T15:54:21.751044+0000 allocated e6b0000 extents
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Jul 26 10:25:07 condor_sc0 docker[19100]: -9626>
2021-07-26T10:25:05.512+0000 7f9b3ed48f40 20 bluefs _read fetching
0x0~80000 of 1:0x1185d90000~80000
Jul 26 10:25:07 condor_sc0 docker[19100]: -9625>
2021-07-26T10:25:05.513+0000 7f9b3ed48f40 20 bluefs _read left 0x80000 len
0x8000
^^^ I expected this stuff to count up to -1 where the most interesting stuff
should be...
Jul 26 10:25:09 condor_sc0 docker[19550]: Error response from daemon: No
such container: ceph-osd-1
Jul 26 10:25:19 condor_sc0 systemd[1]: ceph-osd@1.service holdoff time
over, scheduling restart.
Jul 26 10:25:19 condor_sc0 systemd[1]: Stopped Ceph OSD.
Jul 26 10:25:19 condor_sc0 systemd[1]: Starting Ceph OSD...
It would be also great to collect the output for the following commands: ...
I've tried running ceph-bluestore-tool previously on this system but both
commands fails with the following error:
[qs-admin@condor_sc0 ~]$ sudo docker exec 419d997e5a05 ceph-bluestore-tool
--path /var/lib/ceph/osd/ceph-1 --command bluefs-stats
error from cold_open: (11) Resource temporarily unavailable
2021-07-26T10:50:15.032+0000 7f9a9bf68240 -1
bluestore(/var/lib/ceph/osd/ceph-1) _lock_fsid failed to lock
/var/lib/ceph/osd/ceph-1/fsid (is another ceph-osd still running?)(11) Resource
temporarily unavailable
[qs-admin@condor_sc0 ~]$
There's only one OSD running on this server; should I be stopping it / the
other OSDs in the cluster before running the `ceph-bluestore-tool` command?
Previously when the OSDs were failing to start, /var/lib/ceph/osd/ceph-1/ was
empty but it now contains the following:
Each folder under /var/lib/ceph/osd/ceph-N/ should be used exclusively
by a single OSD. ceph-bluestore-tool to be run when the respective OSD
is shutdown, other OSDs referring to different folders shouldn't matter.
Is the above valid for your case?
[qs-admin@condor_sc0 ~]$ sudo docker exec 419d997e5a05 ls
/var/lib/ceph/osd/ceph-1
block
ceph_fsid
fsid
keyring
ready
require_osd_release
type
whoami
[qs-admin@condor_sc0 ~]$
And finally you can try to switch to bitmap allocator as a workaround ...
Switching to the bitmap allocator as you suggested has led to both failing OSDs
starting up successfully. I've now got 3/3 OSDs up and in! The cluster still
has MDS issues that were blocked behind getting the OSDs running as mentioned
in my original post, but I think these are unrelated to the OSD problem as it's
an issue we've seen in isolation elsewhere.
So - that's a big step forward! Should I retry with my original config on the
latest octopus release and see if this is now fixed?
yeah, looks like this is a hybrid allocator bug - hence you can upgrade
and check if this is fixed.
Cheers again,
Dave
-----Original Message-----
From: Igor Fedotov <ifedo...@suse.de>
Sent: 26 July 2021 11:14
To: Dave Piper <david.pi...@microsoft.com>; ceph-users@ceph.io
Subject: Re: [EXTERNAL] Re: [ceph-users] OSDs flapping with "_open_alloc loaded 132
GiB in 2930776 extents available 113 GiB"
Hi Dave,
Some notes first:
1) The following behavior is fine, BlueStore mounts in two stages - the first
one is read-only and among other things it loads allocation map from DB. And
that's exactly the case here.
Jul 26 08:55:31 condor_sc0 docker[15282]: 2021-07-26T08:55:31.703+0000
7f0e15b3df40 1 bluestore(/var/lib/ceph/osd/ceph-1) _open_alloc loaded
132 GiB in 2930776 extents available 113 GiB Jul 26 08:55:31 condor_sc0
docker[15282]: 2021-07-26T08:55:31.703+0000
7f0e15b3df40 4 rocksdb: [db/db_impl.cc:390] Shutdown: canceling all background
work Jul 26 08:55:31 condor_sc0 docker[15282]: 2021-07-26T08:55:31.704+0000
7f0e15b3df40 4 rocksdb: [db/db_impl.cc:563] Shutdown complete
2) What's really broken is the following allocation attempt:
Jul 26 08:55:34 condor_sc0 docker[15282]: 2021-07-26T08:55:34.767+0000
7f0e15b3df40 1 bluefs _allocate failed to allocate 0x100716 on bdev 1, free
0xd0000; fallback to bdev 2 Jul 26 08:55:34 condor_sc0 docker[15282]:
2021-07-26T08:55:34.767+0000
7f0e15b3df40 1 bluefs _allocate unable to allocate 0x100716 on bdev 2, free
0xffffffffffffffff; fallback to slow device expander Jul 26 08:55:35 condor_sc0
docker[15282]: 2021-07-26T08:55:35.042+0000
7f0e15b3df40 -1 bluestore(/var/lib/ceph/osd/ceph-1)
allocate_bluefs_freespace failed to allocate on 0x40000000 min_size
0x110000 > allocated total 0x0 bluefs_shared_alloc_size 0x10000 allocated 0x0
available 0x 1c09738000 Jul 26 08:55:35 condor_sc0 docker[15282]:
2021-07-26T08:55:35.044+0000
7f0e15b3df40 -1 bluefs _allocate failed to expand slow device to fit
+0x100716
Jul 26 08:55:35 condor_sc0 docker[15282]: 2021-07-26T08:55:35.044+0000
7f0e15b3df40 -1 bluefs _flush_range allocated: 0x0 offset: 0x0 length:
0x100716
This occurs during BlueFS recovery and that's an attempt to get more space to
write out the bluefs log. This shouldn't fail given the plenty of free space:
... available 0x 1c09738000 ...
So to get more verbose but less log one can set both debug-bluestore and
debug-bluefs to 1/20. This way just last 10000 lines of the log preceeding the
crash would be at level 20. Which seems sufficient for the troubleshooting.
It would be also great to collect the output for the following commands:
ceph-bluestore-tool --path <osd-dir> --command bluefs-bdev-sizes
ceph-bluestore-tool --path <osd-dir> --command bluefs-stats
And finally you can try to switch to bitmap allocator as a workaround - we've
fixed a couple of issues in Hybrid one which prevented from proper allcoations
under some circumstances. The fixes were made after v15.2.11 release hence this
might be the case. So please try setting:
bluestore_allocator = bitmap
bluefs_allocator = bitmap
Thanks,
Igor
On 7/26/2021 12:14 PM, Dave Piper wrote:
Hi Igor,
Thanks for your time looking into this.
I've attached a 5 minute window of OSD logs, which includes several restart
attempt (each one takes ~25 seconds).
When I said it looked like we were starting up in a different state, I'm referring to how
"Recovered from manifest file" log appears twice, with different logs
afterwards. This behaviour seems to repeat reliably on each restart of the OSD. My
interpretation of this was that when the initial recovery attempt leads to the rocksdb
shutdown, ceph is automatically trying to start the OSD in some alternative state but
that this is also failing (with the bdev errors I copied in). Possibly I'm inferring too
much.
I tried turning up the logging levels for rocksdb and bluestore but they're
both very spammy so I've not included this in the attached logs. Let me know if
you think that would be helpful.
My ceph version is 15.2.11. We're running a containerized deployment using
docker image ceph-daemon:v5.0.10-stable-5.0-octopus-centos-8 .
[qs-admin@condor_sc0 metaswitch]$ sudo docker exec b732f9135b42 ceph
version ceph version 15.2.11
(e3523634d9c2227df9af89a4eac33d16738c49cb) octopus (stable)
Cheers,
Dave
-----Original Message-----
From: Igor Fedotov <ifedo...@suse.de>
Sent: 23 July 2021 20:45
To: Dave Piper <david.pi...@microsoft.com>; ceph-users@ceph.io
Subject: [EXTERNAL] Re: [ceph-users] OSDs flapping with "_open_alloc loaded 132 GiB
in 2930776 extents available 113 GiB"
Hi Dave,
The follow log line indicates that allocator has just completed loading
information about free disk blocks into memory. And it looks perfectly fine.
_open_alloc loaded 132 GiB in 2930776 extents available 113 GiB
Subsequent rocksdb shutdown looks weird without any other log output indicating
the issue.
Curious what do you mean under "
After that we seem to try starting up in a slightly different state and get a
different set of errors:
"
The resulted errors show lack of disk space at some point but I'd definitely
like to get the full startup log.
Please also specify which Octopus version do you have?
Thanks,
Igor
On 7/23/2021 6:48 PM, Dave Piper wrote:
Hi all,
We've got a containerized test cluster with 3 OSDs and ~ 220GiB of data. Shortly
after upgrading from nautilus -> octopus, 2 of the 3 OSDs have started
flapping. I've also got alarms about the MDS being damaged, which we've seen
elsewhere and have a recovery process for, but I'm unable to run this (I suspect
because I've only got 1 functioning OSD). My RGWs are also failing to start, again
I suspect because of the bad state of OSDs. I've tried restarting all OSDs,
rebooting all servers, checked auth (all looks fine) - but I'm still in the same
state.
My OSDs seem to be failing at the "_open_alloc opening allocation metadata"
step; looking at logs for each OSD restart, the OSD writes this log, then no logs for a
few minutes and then logs:
bluestore(/var/lib/ceph/osd/ceph-1) _open_alloc loaded 132 GiB in
2930776 extents available 113 GiB
rocksdb: [db/db_impl.cc:390] Shutdown: canceling all background
work
After that we seem to try starting up in a slightly different state and get a
different set of errors:
bluefs _allocate failed to allocate 0x100716 on bdev 1, free 0xd0000;
fallback to bdev 2
bluefs _allocate unable to allocate 0x100716 on bdev 2, free
0xffffffffffffffff; fallback to slow device expander
and eventually crash and log a heap of stack dumps.
I don't know what extents are but I seem to have a lot of them, and more than
I've got capacity for? Maybe I'm running out of RAM or disk space somewhere,
but I've got 21GB of free RAM on the server, and each OSD has a 350GiB device
attached to it.
I'm wondering if anyone has seen anything like this before or can suggest next
debug steps to take?
Cheers,
Dave
Full OSD logs surrounding the "_open_alloc opening allocation metadata" step:
Jul 23 00:07:13 condor_sc0 container_name/ceph-osd-1[1709]:
2021-07-23T00:07:13.818+0000 7f3de111bf40 4 rocksdb: EVENT_LOG_v1
{"time_micros": 1626998833819439, "job": 1, "event":
"recovery_started", "log_files": [392088, 392132]}
Jul 23 00:07:13 condor_sc0 container_name/ceph-osd-1[1709]:
2021-07-23T00:07:13.818+0000 7f3de111bf40 4 rocksdb:
[db/db_impl_open.cc:583] Recovering log #392088 mode 0
Jul 23 00:07:17 condor_sc0 container_name/ceph-osd-1[1709]:
2021-07-23T00:07:17.240+0000 7f3de111bf40 4 rocksdb:
[db/db_impl_open.cc:583] Recovering log #392132 mode 0
Jul 23 00:07:17 condor_sc0 container_name/ceph-osd-1[1709]:
2021-07-23T00:07:17.486+0000 7f3de111bf40 4 rocksdb: EVENT_LOG_v1
{"time_micros": 1626998837486404, "job": 1, "event":
"recovery_finished"}
Jul 23 00:07:17 condor_sc0 container_name/ceph-osd-1[1709]:
2021-07-23T00:07:17.486+0000 7f3de111bf40 1
bluestore(/var/lib/ceph/osd/ceph-1) _open_db opened rocksdb path db
options
compression=kNoCompression,max_write_buffer_number=4,min_write_buffer
_
number_to_merge=1,recycle_log_file_num=4,write_buffer_size=268435456,
w
ritable_file_max_buffer_size=0,compaction_readahead_size=2097152,max_
b
ackground_compactions=2
Jul 23 00:07:17 condor_sc0 container_name/ceph-osd-1[1709]:
2021-07-23T00:07:17.524+0000 7f3de111bf40 1 freelist init
Jul 23 00:07:17 condor_sc0 container_name/ceph-osd-1[1709]:
2021-07-23T00:07:17.524+0000 7f3de111bf40 1 freelist
_init_from_label
Jul 23 00:07:17 condor_sc0 container_name/ceph-osd-1[1709]:
2021-07-23T00:07:17.529+0000 7f3de111bf40 1
bluestore(/var/lib/ceph/osd/ceph-1) _open_alloc opening allocation
metadata
Jul 23 00:07:18 condor_sc0 container_name/ceph-osd-1[1709]:
2021-07-23T00:07:18.238+0000 7f3de111bf40 1 HybridAllocator
_spillover_range constructing fallback allocator
Jul 23 00:07:20 condor_sc0 container_name/ceph-osd-1[1709]:
2021-07-23T00:07:20.563+0000 7f3de111bf40 1
bluestore(/var/lib/ceph/osd/ceph-1) _open_alloc loaded 132 GiB in
2930776 extents available 113 GiB
Jul 23 00:07:20 condor_sc0 container_name/ceph-osd-1[1709]:
2021-07-23T00:07:20.563+0000 7f3de111bf40 4 rocksdb:
[db/db_impl.cc:390] Shutdown: canceling all background work
Jul 23 00:07:20 condor_sc0 container_name/ceph-osd-1[1709]:
2021-07-23T00:07:20.565+0000 7f3de111bf40 4 rocksdb:
[db/db_impl.cc:563] Shutdown complete
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