Re: PGs stuck in creating state

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Sage,
Thank you for quick response. I've seen notes about localized PGs and that they do not make sense. However I did not realize that it was what I had hit. I will follow your suggestion and wait out for 0.47 - if it is not (actually) broken - don't fix it. :) 

Regards,
Vladimir

On 20/04/12 14:41, Sage Weil wrote:

On Fri, 20 Apr 2012, Vladimir Bashkirtsev wrote:

Dear devs,

First of all I would like to bow my head at your great effort! Even if ceph
did not reach prime time status yet it is already extremely powerful and
fairly stable to the point we have deployed it in live environment (still
backing up of course).

I have played with ceph extensively to put it different failed modes and it
recovers in most cases without major issues. However when I was adding up OSDs
I have got 2 PGs stuck in creating mode and does not matter what I have done
(changing CRUSH, restarting OSDs in order to get ceph to move data around)
they still there. So instead of using scientific blindfold method I decided to
dig deeper. So here we go (please disregard stuck active+remapped as it is
part of another problem):

[root@gamma tmp]# ceph -s
2012-04-20 12:40:45.294969    pg v625626: 600 pgs: 2 creating, 586
active+clean, 12 active+remapped; 253 GB data, 767 GB used, 1292 GB / 2145 GB
avail
2012-04-20 12:40:45.299426   mds e457: 1/1/1 up {0=2=up:active}, 2 up:standby
2012-04-20 12:40:45.299549   osd e6022: 6 osds: 6 up, 6 in
2012-04-20 12:40:45.299856   log 2012-04-20 12:26:43.988716 mds.0
172.16.64.202:6802/21363 1 : [DBG] reconnect by client.13897
172.16.64.10:0/1319861516 after 0.101633
2012-04-20 12:40:45.300160   mon e1: 3 mons at
{0=172.16.64.200:6789/0,1=172.16.64.201:6789/0,2=172.16.64.202:6789/0}

[root@gamma tmp]# ceph pg dump | grep creating
2.1p3   0       0       0       0       0       0       0       creating
0.000000        0'0     0'0     []      []      0'0     0.000000
1.1p3   0       0       0       0       0       0       0       creating
0.000000        0'0     0'0     []      []      0'0     0.000000

Sigh.. this is exactly the problem I noticed last week that prompted the
'localized pgs' email.  I'm working on patches to remove this
functionality entirely as we speak, since it's a broken design in several
ways.

Once you restart your osds (be sure to control-c that 'ceph' command
first), you should be able to wipe out those bad pgs with

	ceph osd pool disable_lpgs<poolname>  --yes-i-really-mean-it

This is in current master, and will be included in 0.46.

Alternatively, you can just ignore those pgs for the time being.  They
are completely harmless as long as you can tolerate the ceph -s/ceph
health noise.  v0.47 should silently zap them all on upgrade.

sage


My understanding is that p3 means that PG creating on osd.3 . I've tried to
stop and restart osd.3 - no banana. So I went to more dramatic option: lose
osd.3 . Completely destroyed osd.3 and rebuilt it from scratch. osd.3 came
back again with exactly the same PGs in creating mode - makes me think that
that osd.3 is not responsible for this.

[root@gamma tmp]# ceph osd dump
dumped osdmap epoch 6022
epoch 6022
fsid 7719f573-4c48-4852-a27f-51c7a3fe1c1e
created 2012-03-31 04:47:12.130128
modifed 2012-04-20 12:26:56.406193
flags

pool 0 'data' rep size 3 crush_ruleset 0 object_hash rjenkins pg_num 192
pgp_num 192 lpg_num 2 lpgp_num 2 last_change 1137 owner 0
crash_replay_interval 45
pool 1 'metadata' rep size 3 crush_ruleset 1 object_hash rjenkins pg_num 192
pgp_num 192 lpg_num 2 lpgp_num 2 last_change 1160 owner 0
pool 2 'rbd' rep size 3 crush_ruleset 2 object_hash rjenkins pg_num 192
pgp_num 192 lpg_num 2 lpgp_num 2 last_change 1141 owner 0

max_osd 6
osd.0 up   in  weight 1 up_from 6001 up_thru 6018 down_at 6000
last_clean_interval [5980,5996) 172.16.64.200:6804/23046
172.16.64.200:6805/23046 172.16.64.200:6806/23046 exists,up
osd.1 up   in  weight 1 up_from 5998 up_thru 6017 down_at 5997
last_clean_interval [5992,5996) 172.16.64.201:6804/27598
172.16.64.201:6805/27598 172.16.64.201:6806/27598 exists,up
osd.2 up   in  weight 1 up_from 5998 up_thru 6019 down_at 5997
last_clean_interval [5978,5996) 172.16.64.202:6804/21457
172.16.64.202:6805/21457 172.16.64.202:6806/21457 exists,up
osd.3 up   in  weight 1 up_from 5972 up_thru 6017 down_at 5970
last_clean_interval [5884,5969) lost_at 1163 172.16.64.203:6800/10614
172.16.64.203:6801/10614 172.16.64.203:6802/10614 exists,up
osd.4 up   in  weight 1 up_from 5995 up_thru 6017 down_at 5988
last_clean_interval [5898,5987) 172.16.64.204:6800/16357
172.16.64.204:6801/16357 172.16.64.204:6802/16357 exists,up
osd.5 up   in  weight 1 up_from 5984 up_thru 6021 down_at 5982
last_clean_interval [5921,5981) 172.16.64.205:6800/11346
172.16.64.205:6801/11346 172.16.64.205:6803/11346 exists,up

pg_temp 0.25 [0,1,4]
pg_temp 0.33 [0,1,5]
pg_temp 0.3e [1,0,4]
pg_temp 0.48 [1,0,4]
pg_temp 1.24 [0,1,4]
pg_temp 1.32 [0,1,5]
pg_temp 1.3d [1,0,4]
pg_temp 1.47 [1,0,2]
pg_temp 2.23 [0,1,4]
pg_temp 2.31 [0,1,5]
pg_temp 2.3c [1,0,4]
pg_temp 2.46 [1,0,4]
blacklist 172.16.64.202:6800/19544 expires 2012-04-20 12:45:43.842394
blacklist 172.16.64.200:6800/22946 expires 2012-04-20 12:50:17.341910
blacklist 172.16.64.201:6803/27504 expires 2012-04-20 12:50:20.102205

Then I have attempted to find out what's going on with 2.1p3:

[root@delta ceph]# ceph pg 2.1p3 query

at this point nothing did happen - it just sits there. At least it seems so
but in reality:

[root@delta ceph]# ceph -s
2012-04-20 12:49:50.322103    pg v625936: 600 pgs: 2 creating, 4 stale, 400
active+degraded, 3 stale+peering, 174 stale+active+degraded, 1
down+remapped+peering, 4 active+degraded+remapped, 1 stale+remapped+peering, 3
stale+active+replay+degraded, 8 stale+active+degraded+remapped; 253 GB data,
768 GB used, 1292 GB / 2145 GB avail; 138289/230205 degraded (60.072%)
2012-04-20 12:49:50.326769   mds e457: 1/1/1 up {0=2=up:active}, 2 up:standby
2012-04-20 12:49:50.326886   osd e6042: 6 osds: 1 up, 6 in
2012-04-20 12:49:50.327226   log 2012-04-20 12:49:16.732954 mon.0
172.16.64.200:6789/0 35 : [INF] osd.4 172.16.64.204:6800/16357 failed (by
osd.5 172.16.64.205:6800/11346)
2012-04-20 12:49:50.327497   mon e1: 3 mons at
{0=172.16.64.200:6789/0,1=172.16.64.201:6789/0,2=172.16.64.202:6789/0}

So as you can see 5 out of 6 OSDs crashed. Restarting all crashed OSDs
manually gets ceph back on the feet without any damage - minute later
everything runs as nothing happened and it is good time to see the logs. In
particular osd.3 log:

2012-04-20 12:47:38.944653 aadd6b40 --OSD::tracker-- seq: 56, time: 2012-04-20
12:47:38.944641, event: started pg_info(1 pgs e6026) v1
2012-04-20 12:47:38.965044 aadd6b40 --OSD::tracker-- seq: 57, time: 2012-04-20
12:47:38.965017, event: waiting_for_osdmap pg_info(1 pgs e6025) v1
2012-04-20 12:47:38.965098 aadd6b40 --OSD::tracker-- seq: 57, time: 2012-04-20
12:47:38.965086, event: started pg_info(1 pgs e6025) v1
2012-04-20 12:47:38.965179 aadd6b40 --OSD::tracker-- seq: 58, time: 2012-04-20
12:47:38.965165, event: waiting_for_osdmap pg_log(1.8 epoch 6026 query_epoch
6026) v2
2012-04-20 12:47:38.965215 aadd6b40 --OSD::tracker-- seq: 58, time: 2012-04-20
12:47:38.965202, event: started pg_log(1.8 epoch 6026 query_epoch 6026) v2
2012-04-20 12:47:38.965421 aadd6b40 --OSD::tracker-- seq: 59, time: 2012-04-20
12:47:38.965408, event: waiting_for_osdmap pg_info(1 pgs e6026) v1
2012-04-20 12:47:38.965461 aadd6b40 --OSD::tracker-- seq: 59, time: 2012-04-20
12:47:38.965449, event: started pg_info(1 pgs e6026) v1
2012-04-20 12:47:38.990427 ab5d7b40 --OSD::tracker-- seq: 60, time: 2012-04-20
12:47:38.990388, event: waiting_for_osdmap osd_pg_create(pg1.1p3,619;
pg2.1p3,1141; ) v2
2012-04-20 12:47:38.990592 aadd6b40 --OSD::tracker-- seq: 61, time: 2012-04-20
12:47:38.990579, event: waiting_for_osdmap pg_info(1 pgs e6026) v1
2012-04-20 12:47:38.994296 aadd6b40 --OSD::tracker-- seq: 61, time: 2012-04-20
12:47:38.993072, event: started pg_info(1 pgs e6026) v1
2012-04-20 12:47:39.077303 ab5d7b40 --OSD::tracker-- seq: 60, time: 2012-04-20
12:47:39.077276, event: started osd_pg_create(pg1.1p3,619; pg2.1p3,1141; ) v2
2012-04-20 12:47:54.546810 ab5d7b40 --OSD::tracker-- seq: 62, time: 2012-04-20
12:47:54.546770, event: waiting_for_osdmap osd_op(client.13891.0:90331
rb.0.1.000000000b40 [write 3661824~4096] 2.1f179073) v4
osd/OSD.cc: In function 'PG* OSD::_lookup_lock_pg(pg_t)' thread a65cdb40 time
2012-04-20 12:47:54.562370
osd/OSD.cc: 1162: FAILED assert(pg_map.count(pgid))
  ceph version 0.45 (commit:0aea1cb1df5c3e5ab783ca6f2ed7649823b613c5)
  1: /usr/bin/ceph-osd() [0x81f3b04]
  2: (OSD::do_command(Connection*, unsigned long long, std::vector<std::string,
std::allocator<std::string>  >&, ceph::buffer::list&)+0x1381) [0x8202b21]
  3: (OSD::CommandWQ::_process(OSD::Command*)+0x51) [0x823ac71]
  4: (ThreadPool::WorkQueue<OSD::Command>::_void_process(void*)+0x18)
[0x8224758]
  5: (ThreadPool::worker()+0x42d) [0x82f8ddd]
  6: (ThreadPool::WorkThread::entry()+0x1f) [0x822559f]
  7: (Thread::_entry_func(void*)+0x10) [0x82f3140]
  8: (()+0x6cd3) [0x6e0cd3]
  9: (clone()+0x5e) [0xa3ca2e]
  ceph version 0.45 (commit:0aea1cb1df5c3e5ab783ca6f2ed7649823b613c5)
  1: /usr/bin/ceph-osd() [0x81f3b04]
  2: (OSD::do_command(Connection*, unsigned long long, std::vector<std::string,
std::allocator<std::string>  >&, ceph::buffer::list&)+0x1381) [0x8202b21]
  3: (OSD::CommandWQ::_process(OSD::Command*)+0x51) [0x823ac71]
  4: (ThreadPool::WorkQueue<OSD::Command>::_void_process(void*)+0x18)
[0x8224758]
  5: (ThreadPool::worker()+0x42d) [0x82f8ddd]
  6: (ThreadPool::WorkThread::entry()+0x1f) [0x822559f]
  7: (Thread::_entry_func(void*)+0x10) [0x82f3140]
  8: (()+0x6cd3) [0x6e0cd3]
  9: (clone()+0x5e) [0xa3ca2e]
*** Caught signal (Aborted) **
  in thread a65cdb40
  ceph version 0.45 (commit:0aea1cb1df5c3e5ab783ca6f2ed7649823b613c5)
  1: /usr/bin/ceph-osd() [0x83754db]
  2: [0x8c0400]
  3: [0x8c0416]
  4: (gsignal()+0x4f) [0x97898f]
  5: (abort()+0x175) [0x97a2d5]
  6: (__gnu_cxx::__verbose_terminate_handler()+0x14d) [0x7a754d]
  7: (()+0xb02c4) [0x7a52c4]
  8: (()+0xb0300) [0x7a5300]
  9: (()+0xb044f) [0x7a544f]
  10: (ceph::__ceph_assert_fail(char const*, char const*, int, char
const*)+0x255) [0x8300715]
  11: /usr/bin/ceph-osd() [0x81f3b04]
  12: (OSD::do_command(Connection*, unsigned long long,
std::vector<std::string, std::allocator<std::string>  >&,
ceph::buffer::list&)+0x1381) [0x8202b21]
  13: (OSD::CommandWQ::_process(OSD::Command*)+0x51) [0x823ac71]
  14: (ThreadPool::WorkQueue<OSD::Command>::_void_process(void*)+0x18)
[0x8224758]
  15: (ThreadPool::worker()+0x42d) [0x82f8ddd]
  16: (ThreadPool::WorkThread::entry()+0x1f) [0x822559f]
  17: (Thread::_entry_func(void*)+0x10) [0x82f3140]
  18: (()+0x6cd3) [0x6e0cd3]
  19: (clone()+0x5e) [0xa3ca2e]

So there's couple of things to note:
1. At 2012-04-20 12:47:39.077303 osd started creating PGs in question
2. At 2012-04-20 12:47:54.546810 we got FAILED assert(pg_map.count(pgid))

And at this point I guess it is over to you guys as I do not have any idea why
this assert fails. If you point me in right direction I would be eternally
grateful! :)

Regards,
Vladimir
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