Hi,
Just an update here. Another user saw this and after playing with it I
identified a problem with CRUSH. There is a branch outstanding
(wip-crush) that is pending review, but it's not a quick fix because of
compatibility issues.
sage
On Thu, 6 Feb 2014, Dominik Mostowiec wrote:
> Hi,
> Mabye this info can help to find what is wrong.
> For one PG (3.1e4a) which is active+remapped:
> { "state": "active+remapped",
> "epoch": 96050,
> "up": [
> 119,
> 69],
> "acting": [
> 119,
> 69,
> 7],
> Logs:
> On osd.7:
> 2014-02-04 09:45:54.966913 7fa618afe700 1 osd.7 pg_epoch: 94460
> pg[3.1e4a( v 94459'207004 (72275'204004,94459'207004] local-les=93486
> n=6718 ec=4 les/c 93486/93486 94460/94460/92233) [119,69] r=-1
> lpr=94460 pi=92546-94459/5 lcod 94459'207003 inactive NOTIFY]
> state<Start>: transitioning to Stray
> 2014-02-04 09:45:55.781278 7fa6172fb700 1 osd.7 pg_epoch: 94461
> pg[3.1e4a( v 94459'207004 (72275'204004,94459'207004] local-les=93486
> n=6718 ec=4 les/c 93486/93486 94460/94461/92233)
> [119,69]/[119,69,7,142] r=2 lpr=94461 pi=92546-94460/6 lcod
> 94459'207003 remapped NOTIFY] state<Start>: transitioning to Stray
> 2014-02-04 09:49:01.124510 7fa618afe700 1 osd.7 pg_epoch: 94495
> pg[3.1e4a( v 94459'207004 (72275'204004,94459'207004] local-les=94462
> n=6718 ec=4 les/c 94462/94494 94460/94495/92233) [119,69]/[119,69,7]
> r=2 lpr=94495 pi=92546-94494/7 lcod 94459'207003 remapped]
> state<Start>: transitioning to Stray
>
> On osd.119:
> 2014-02-04 09:45:54.981707 7f37f07c5700 1 osd.119 pg_epoch: 94460
> pg[3.1e4a( v 94459'207004 (72275'204004,94459'207004] local-les=93486
> n=6718 ec=4 les/c 93486/93486 94460/94460/92233) [119,69] r=0
> lpr=94460 pi=93485-94459/1 mlcod 0'0 inactive] state<Start>:
> transitioning to Primary
> 2014-02-04 09:45:55.805712 7f37ecfbe700 1 osd.119 pg_epoch: 94461
> pg[3.1e4a( v 94459'207004 (72275'204004,94459'207004] local-les=93486
> n=6718 ec=4 les/c 93486/93486 94460/94461/92233)
> [119,69]/[119,69,7,142] r=0 lpr=94461 pi=93485-94460/2 mlcod 0'0
> remapped] state<Start>: transitioning to Primary
> 2014-02-04 09:45:56.794015 7f37edfc0700 0 log [INF] : 3.1e4a
> restarting backfill on osd.69 from (0'0,0'0] MAX to 94459'207004
> 2014-02-04 09:49:01.156627 7f37ef7c3700 1 osd.119 pg_epoch: 94495
> pg[3.1e4a( v 94459'207004 (72275'204004,94459'207004] local-les=94462
> n=6718 ec=4 les/c 94462/94494 94460/94495/92233) [119,69]/[119,69,7]
> r=0 lpr=94495 pi=94461-94494/1 mlcod 0'0 remapped] state<Start>:
> transitioning to Primary
>
> On osd.69:
> 2014-02-04 09:45:56.845695 7f2231372700 1 osd.69 pg_epoch: 94462
> pg[3.1e4a( empty local-les=0 n=0 ec=4 les/c 93486/93486
> 94460/94461/92233) [119,69]/[119,69,7,142] r=1 lpr=94462
> pi=93485-94460/2 inactive] state<Start>: transitioning to Stray
> 2014-02-04 09:49:01.153695 7f2229b63700 1 osd.69 pg_epoch: 94495
> pg[3.1e4a( v 94459'207004 (72275'204004,94459'207004] local-les=94462
> n=6718 ec=4 les/c 94462/94494 94460/94495/92233) [119,69]/[119,69,7]
> r=1 lpr=94495 pi=93485-94494/3 remapped] state<Start>: transitioning
> to Stray
>
> pq query recovery state:
> "recovery_state": [
> { "name": "Started\/Primary\/Active",
> "enter_time": "2014-02-04 09:49:02.070724",
> "might_have_unfound": [],
> "recovery_progress": { "backfill_target": -1,
> "waiting_on_backfill": 0,
> "backfill_pos": "0\/\/0\/\/-1",
> "backfill_info": { "begin": "0\/\/0\/\/-1",
> "end": "0\/\/0\/\/-1",
> "objects": []},
> "peer_backfill_info": { "begin": "0\/\/0\/\/-1",
> "end": "0\/\/0\/\/-1",
> "objects": []},
> "backfills_in_flight": [],
> "pull_from_peer": [],
> "pushing": []},
> "scrub": { "scrubber.epoch_start": "77502",
> "scrubber.active": 0,
> "scrubber.block_writes": 0,
> "scrubber.finalizing": 0,
> "scrubber.waiting_on": 0,
> "scrubber.waiting_on_whom": []}},
> { "name": "Started",
> "enter_time": "2014-02-04 09:49:01.156626"}]}
>
> ---
> Regards
> Dominik
>
> 2014-02-04 12:09 GMT+01:00 Dominik Mostowiec <dominikmostowiec@xxxxxxxxx>:
> > Hi,
> > Thanks for Your help !!
> > We've done again 'ceph osd reweight-by-utilization 105'
> > Cluster stack on 10387 active+clean, 237 active+remapped;
> > More info in attachments.
> >
> > --
> > Regards
> > Dominik
> >
> >
> > 2014-02-04 Sage Weil <sage@xxxxxxxxxxx>:
> >> Hi,
> >>
> >> I spent a couple hours looking at your map because it did look like there
> >> was something wrong. After some experimentation and adding a bucnh of
> >> improvements to osdmaptool to test the distribution, though, I think
> >> everything is working as expected. For pool 3, your map has a standard
> >> deviation in utilizations of ~8%, and we should expect ~9% for this number
> >> of PGs. For all pools, it is slightly higher (~9% vs expected ~8%).
> >> This is either just in the noise, or slightly confounded by the lack of
> >> the hashpspool flag on the pools (which slightly amplifies placement
> >> nonuniformity with multiple pools... not enough that it is worth changing
> >> anything though).
> >>
> >> The bad news is that that order of standard deviation results in pretty
> >> wide min/max range of 118 to 202 pgs. That seems a *bit* higher than we a
> >> perfectly random placement generates (I'm seeing a spread in that is
> >> usually 50-70 pgs), but I think *that* is where the pool overlap (no
> >> hashpspool) is rearing its head; for just pool three the spread of 50 is
> >> about what is expected.
> >>
> >> Long story short: you have two options. One is increasing the number of
> >> PGs. Note that this helps but has diminishing returns (doubling PGs
> >> only takes you from ~8% to ~6% standard deviation, quadrupling to ~4%).
> >>
> >> The other is to use reweight-by-utilization. That is the best approach,
> >> IMO. I'm not sure why you were seeing PGs stuck in the remapped state
> >> after you did that, though, but I'm happy to dig into that too.
> >>
> >> BTW, the osdmaptool addition I was using to play with is here:
> >> https://github.com/ceph/ceph/pull/1178
> >>
> >> sage
> >>
> >>
> >> On Mon, 3 Feb 2014, Dominik Mostowiec wrote:
> >>
> >>> In other words,
> >>> 1. we've got 3 racks ( 1 replica per rack )
> >>> 2. in every rack we have 3 hosts
> >>> 3. every host has 22 OSD's
> >>> 4. all pg_num's are 2^n for every pool
> >>> 5. we enabled "crush tunables optimal".
> >>> 6. on every machine we disabled 4 unused disk's (osd out, osd reweight
> >>> 0 and osd rm)
> >>>
> >>> Pool ".rgw.buckets": one osd has 105 PGs and other one (on the same
> >>> machine) has 144 PGs (37% more!).
> >>> Other pools also have got this problem. It's not efficient placement.
> >>>
> >>> --
> >>> Regards
> >>> Dominik
> >>>
> >>>
> >>> 2014-02-02 Dominik Mostowiec <dominikmostowiec@xxxxxxxxx>:
> >>> > Hi,
> >>> > For more info:
> >>> > crush: http://dysk.onet.pl/link/r4wGK
> >>> > osd_dump: http://dysk.onet.pl/link/I3YMZ
> >>> > pg_dump: http://dysk.onet.pl/link/4jkqM
> >>> >
> >>> > --
> >>> > Regards
> >>> > Dominik
> >>> >
> >>> > 2014-02-02 Dominik Mostowiec <dominikmostowiec@xxxxxxxxx>:
> >>> >> Hi,
> >>> >> Hmm,
> >>> >> You think about sumarize PGs from different pools on one OSD's i think.
> >>> >> But for one pool (.rgw.buckets) where i have almost of all my data, PG
> >>> >> count on OSDs is aslo different.
> >>> >> For example 105 vs 144 PGs from pool .rgw.buckets. In first case it is
> >>> >> 52% disk usage, second 74%.
> >>> >>
> >>> >> --
> >>> >> Regards
> >>> >> Dominik
> >>> >>
> >>> >>
> >>> >> 2014-02-02 Sage Weil <sage@xxxxxxxxxxx>:
> >>> >>> It occurs to me that this (and other unexplain variance reports) could
> >>> >>> easily be the 'hashpspool' flag not being set. The old behavior had the
> >>> >>> misfeature where consecutive pool's pg's would 'line up' on the same osds,
> >>> >>> so that 1.7 == 2.6 == 3.5 == 4.4 etc would map to the same nodes. This
> >>> >>> tends to 'amplify' any variance in the placement. The default is still to
> >>> >>> use the old behavior for compatibility (this will finally change in
> >>> >>> firefly).
> >>> >>>
> >>> >>> You can do
> >>> >>>
> >>> >>> ceph osd pool set <poolname> hashpspool true
> >>> >>>
> >>> >>> to enable the new placement logic on an existing pool, but be warned that
> >>> >>> this will rebalance *all* of the data in the pool, which can be a very
> >>> >>> heavyweight operation...
> >>> >>>
> >>> >>> sage
> >>> >>>
> >>> >>>
> >>> >>> On Sun, 2 Feb 2014, Dominik Mostowiec wrote:
> >>> >>>
> >>> >>>> Hi,
> >>> >>>> After scrubbing almost all PGs has equal(~) num of objects.
> >>> >>>> I found something else.
> >>> >>>> On one host PG coun on OSDs:
> >>> >>>> OSD with small(52%) disk usage:
> >>> >>>> count, pool
> >>> >>>> 105 3
> >>> >>>> 18 4
> >>> >>>> 3 5
> >>> >>>>
> >>> >>>> Osd with larger(74%) disk usage:
> >>> >>>> 144 3
> >>> >>>> 31 4
> >>> >>>> 2 5
> >>> >>>>
> >>> >>>> Pool 3 is .rgw.buckets (where is almost of all data).
> >>> >>>> Pool 4 is .log, where is no data.
> >>> >>>>
> >>> >>>> Count of PGs shouldn't be the same per OSD ?
> >>> >>>> Or maybe PG hash algorithm is disrupted by wrong count of PG for pool
> >>> >>>> '4'. There is 1440 PGs ( this is not power of 2 ).
> >>> >>>>
> >>> >>>> ceph osd dump:
> >>> >>>> pool 0 'data' rep size 3 min_size 1 crush_ruleset 0 object_hash
> >>> >>>> rjenkins pg_num 64 pgp_num 64 last_change 28459 owner 0
> >>> >>>> crash_replay_interval 45
> >>> >>>> pool 1 'metadata' rep size 3 min_size 1 crush_ruleset 1 object_hash
> >>> >>>> rjenkins pg_num 64 pgp_num 64 last_change 28460 owner 0
> >>> >>>> pool 2 'rbd' rep size 3 min_size 1 crush_ruleset 2 object_hash
> >>> >>>> rjenkins pg_num 64 pgp_num 64 last_change 28461 owner 0
> >>> >>>> pool 3 '.rgw.buckets' rep size 3 min_size 1 crush_ruleset 0
> >>> >>>> object_hash rjenkins pg_num 8192 pgp_num 8192 last_change 73711 owner
> >>> >>>> 0
> >>> >>>> pool 4 '.log' rep size 3 min_size 1 crush_ruleset 0 object_hash
> >>> >>>> rjenkins pg_num 1440 pgp_num 1440 last_change 28463 owner 0
> >>> >>>> pool 5 '.rgw' rep size 3 min_size 1 crush_ruleset 0 object_hash
> >>> >>>> rjenkins pg_num 128 pgp_num 128 last_change 72467 owner 0
> >>> >>>> pool 6 '.users.uid' rep size 3 min_size 1 crush_ruleset 0 object_hash
> >>> >>>> rjenkins pg_num 8 pgp_num 8 last_change 28465 owner 0
> >>> >>>> pool 7 '.users' rep size 3 min_size 1 crush_ruleset 0 object_hash
> >>> >>>> rjenkins pg_num 8 pgp_num 8 last_change 28466 owner 0
> >>> >>>> pool 8 '.usage' rep size 2 min_size 1 crush_ruleset 0 object_hash
> >>> >>>> rjenkins pg_num 8 pgp_num 8 last_change 28467 owner
> >>> >>>> 18446744073709551615
> >>> >>>> pool 9 '.intent-log' rep size 3 min_size 1 crush_ruleset 0 object_hash
> >>> >>>> rjenkins pg_num 8 pgp_num 8 last_change 28468 owner
> >>> >>>> 18446744073709551615
> >>> >>>> pool 10 '.rgw.control' rep size 3 min_size 1 crush_ruleset 0
> >>> >>>> object_hash rjenkins pg_num 8 pgp_num 8 last_change 33485 owner
> >>> >>>> 18446744073709551615
> >>> >>>> pool 11 '.rgw.gc' rep size 3 min_size 1 crush_ruleset 0 object_hash
> >>> >>>> rjenkins pg_num 8 pgp_num 8 last_change 33487 owner
> >>> >>>> 18446744073709551615
> >>> >>>> pool 12 '.rgw.root' rep size 2 min_size 1 crush_ruleset 0 object_hash
> >>> >>>> rjenkins pg_num 8 pgp_num 8 last_change 44540 owner 0
> >>> >>>> pool 13 '' rep size 2 min_size 1 crush_ruleset 0 object_hash rjenkins
> >>> >>>> pg_num 8 pgp_num 8 last_change 46912 owner 0
> >>> >>>>
> >>> >>>> --
> >>> >>>> Regards
> >>> >>>> Dominik
> >>> >>>>
> >>> >>>> 2014-02-01 Dominik Mostowiec <dominikmostowiec@xxxxxxxxx>:
> >>> >>>> > Hi,
> >>> >>>> >> Did you bump pgp_num as well?
> >>> >>>> > Yes.
> >>> >>>> >
> >>> >>>> > See: http://dysk.onet.pl/link/BZ968
> >>> >>>> >
> >>> >>>> >> 25% pools is two times smaller from other.
> >>> >>>> > This is changing after scrubbing.
> >>> >>>> >
> >>> >>>> > --
> >>> >>>> > Regards
> >>> >>>> > Dominik
> >>> >>>> >
> >>> >>>> > 2014-02-01 Kyle Bader <kyle.bader@xxxxxxxxx>:
> >>> >>>> >>
> >>> >>>> >>> Change pg_num for .rgw.buckets to power of 2, an 'crush tunables
> >>> >>>> >>> optimal' didn't help :(
> >>> >>>> >>
> >>> >>>> >> Did you bump pgp_num as well? The split pgs will stay in place until pgp_num
> >>> >>>> >> is bumped as well, if you do this be prepared for (potentially lots) of data
> >>> >>>> >> movement.
> >>> >>>> >
> >>> >>>> >
> >>> >>>> >
> >>> >>>> > --
> >>> >>>> > Pozdrawiam
> >>> >>>> > Dominik
> >>> >>>>
> >>> >>>>
> >>> >>>>
> >>> >>>> --
> >>> >>>> Pozdrawiam
> >>> >>>> Dominik
> >>> >>>>
> >>> >>>>
> >>> >>
> >>> >>
> >>> >>
> >>> >> --
> >>> >> Pozdrawiam
> >>> >> Dominik
> >>> >
> >>> >
> >>> >
> >>> > --
> >>> > Pozdrawiam
> >>> > Dominik
> >>>
> >>>
> >>>
> >>> --
> >>> Pozdrawiam
> >>> Dominik
> >>>
> >>>
> >
> >
> >
> > --
> > Pozdrawiam
> > Dominik
>
>
>
> --
> Pozdrawiam
> Dominik
>
>
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