[ceph-users] CEPH OSD Restarts taking too long v10.2.9

Nikhil R nikh.ravindra at gmail.com
Fri Mar 29 07:14:27 PDT 2019


Any help on this would be much appreciated as our prod is down since a day
and each osd restart is taking 4-5 hours.
in.linkedin.com/in/nikhilravindra



On Fri, Mar 29, 2019 at 7:43 PM Nikhil R <nikh.ravindra at gmail.com> wrote:

> We have maxed out the files per dir. CEPH is trying to do an online split
> due to which osd's are crashing. We increased the split_multiple and
> merge_threshold for now and are restarting osd's. Now on these restarts the
> leveldb compaction is taking a long time. Below are some of the logs.
>
> 2019-03-29 06:25:37.082055 7f3c6320a8c0  0
> genericfilestorebackend(/var/lib/ceph/osd/ceph-83) detect_features: FIEMAP
> ioctl is disabled via 'filestore fiemap' config option
> 2019-03-29 06:25:37.082064 7f3c6320a8c0  0
> genericfilestorebackend(/var/lib/ceph/osd/ceph-83) detect_features:
> SEEK_DATA/SEEK_HOLE is disabled via 'filestore seek data hole' config option
> 2019-03-29 06:25:37.082079 7f3c6320a8c0  0
> genericfilestorebackend(/var/lib/ceph/osd/ceph-83) detect_features: splice
> is supported
> 2019-03-29 06:25:37.096658 7f3c6320a8c0  0
> genericfilestorebackend(/var/lib/ceph/osd/ceph-83) detect_features:
> syncfs(2) syscall fully supported (by glibc and kernel)
> 2019-03-29 06:25:37.096703 7f3c6320a8c0  0
> xfsfilestorebackend(/var/lib/ceph/osd/ceph-83) detect_feature: extsize is
> disabled by conf
> 2019-03-29 06:25:37.295577 7f3c6320a8c0  1 leveldb: Recovering log #1151738
> 2019-03-29 06:25:37.445516 7f3c6320a8c0  1 leveldb: Delete type=0 #1151738
> 2019-03-29 06:25:37.445574 7f3c6320a8c0  1 leveldb: Delete type=3 #1151737
> 2019-03-29 07:11:50.619313 7ff6c792b700  1 leveldb: Compacting 1 at 3 + 12 at 4
> files
> 2019-03-29 07:11:50.639795 7ff6c792b700  1 leveldb: Generated table
> #1029200: 7805 keys, 2141956 bytes
> 2019-03-29 07:11:50.649315 7ff6c792b700  1 leveldb: Generated table
> #1029201: 4464 keys, 1220994 bytes
> 2019-03-29 07:11:50.660485 7ff6c792b700  1 leveldb: Generated table
> #1029202: 7813 keys, 2142882 bytes
> 2019-03-29 07:11:50.672235 7ff6c792b700  1 leveldb: Generated table
> #1029203: 6283 keys, 1712810 bytes
> 2019-03-29 07:11:50.697949 7ff6c792b700  1 leveldb: Generated table
> #1029204: 7805 keys, 2142841 bytes
> 2019-03-29 07:11:50.714648 7ff6c792b700  1 leveldb: Generated table
> #1029205: 5173 keys, 1428905 bytes
> 2019-03-29 07:11:50.757146 7ff6c792b700  1 leveldb: Generated table
> #1029206: 7888 keys, 2143304 bytes
> 2019-03-29 07:11:50.774357 7ff6c792b700  1 leveldb: Generated table
> #1029207: 5168 keys, 1425634 bytes
> 2019-03-29 07:11:50.830276 7ff6c792b700  1 leveldb: Generated table
> #1029208: 7821 keys, 2146114 bytes
> 2019-03-29 07:11:50.849116 7ff6c792b700  1 leveldb: Generated table
> #1029209: 6106 keys, 1680947 bytes
> 2019-03-29 07:11:50.909866 7ff6c792b700  1 leveldb: Generated table
> #1029210: 7799 keys, 2142782 bytes
> 2019-03-29 07:11:50.921143 7ff6c792b700  1 leveldb: Generated table
> #1029211: 5737 keys, 1574963 bytes
> 2019-03-29 07:11:50.923357 7ff6c792b700  1 leveldb: Generated table
> #1029212: 1149 keys, 310202 bytes
> 2019-03-29 07:11:50.923388 7ff6c792b700  1 leveldb: Compacted 1 at 3 + 12 at 4
> files => 22214334 bytes
> 2019-03-29 07:11:50.924224 7ff6c792b700  1 leveldb: compacted to: files[ 0
> 3 54 715 6304 24079 0 ]
> 2019-03-29 07:11:50.942586 7ff6c792b700  1 leveldb: Delete type=2 #1029109
>
> Is there a way i can skip this?
>
> in.linkedin.com/in/nikhilravindra
>
>
>
> On Fri, Mar 29, 2019 at 11:32 AM huang jun <hjwsm1989 at gmail.com> wrote:
>
>> Nikhil R <nikh.ravindra at gmail.com> 于2019年3月29日周五 下午1:44写道:
>> >
>> > if i comment filestore_split_multiple = 72 filestore_merge_threshold =
>> 480   in the ceph.conf wont ceph take the default value of 2 and 10 and we
>> would be in more splits and crashes?
>> >
>> Yes, that aimed to make it clear what results in the long start time,
>> leveldb compact or filestore split?
>> > in.linkedin.com/in/nikhilravindra
>> >
>> >
>> >
>> > On Fri, Mar 29, 2019 at 6:55 AM huang jun <hjwsm1989 at gmail.com> wrote:
>> >>
>> >> It seems like the split settings result the problem,
>> >> what about comment out those settings then see it still used that long
>> >> time to restart?
>> >> As a fast search in code, these two
>> >> filestore_split_multiple = 72
>> >> filestore_merge_threshold = 480
>> >> doesn't support online change.
>> >>
>> >> Nikhil R <nikh.ravindra at gmail.com> 于2019年3月28日周四 下午6:33写道:
>> >> >
>> >> > Thanks huang for the reply.
>> >> > Its is the disk compaction taking more time
>> >> > the disk i/o is completely utilized upto 100%
>> >> > looks like both osd_compact_leveldb_on_mount = false &
>> leveldb_compact_on_mount = false isnt working as expected on ceph v10.2.9
>> >> > is there a way to turn off compaction?
>> >> >
>> >> > Also, the reason why we are restarting osd's is due to splitting and
>> we increased split multiple and merge_threshold.
>> >> > Is there a way we would inject it? Is osd restarts the only solution?
>> >> >
>> >> > Thanks In Advance
>> >> >
>> >> > in.linkedin.com/in/nikhilravindra
>> >> >
>> >> >
>> >> >
>> >> > On Thu, Mar 28, 2019 at 3:58 PM huang jun <hjwsm1989 at gmail.com>
>> wrote:
>> >> >>
>> >> >> Did the time really cost on db compact operation?
>> >> >> or you can turn on debug_osd=20 to see what happens,
>> >> >> what about the disk util during start?
>> >> >>
>> >> >> Nikhil R <nikh.ravindra at gmail.com> 于2019年3月28日周四 下午4:36写道:
>> >> >> >
>> >> >> > CEPH osd restarts are taking too long a time
>> >> >> > below is my ceph.conf
>> >> >> > [osd]
>> >> >> > osd_compact_leveldb_on_mount = false
>> >> >> > leveldb_compact_on_mount = false
>> >> >> > leveldb_cache_size=1073741824
>> >> >> > leveldb_compression = false
>> >> >> > osd_mount_options_xfs = "rw,noatime,inode64,logbsize=256k"
>> >> >> > osd_max_backfills = 1
>> >> >> > osd_recovery_max_active = 1
>> >> >> > osd_recovery_op_priority = 1
>> >> >> > filestore_split_multiple = 72
>> >> >> > filestore_merge_threshold = 480
>> >> >> > osd_max_scrubs = 1
>> >> >> > osd_scrub_begin_hour = 22
>> >> >> > osd_scrub_end_hour = 3
>> >> >> > osd_deep_scrub_interval = 2419200
>> >> >> > osd_scrub_sleep = 0.1
>> >> >> >
>> >> >> > looks like both osd_compact_leveldb_on_mount = false &
>> leveldb_compact_on_mount = false isnt working as expected on ceph v10.2.9
>> >> >> >
>> >> >> > Any ideas on a fix would be appreciated asap
>> >> >> > in.linkedin.com/in/nikhilravindra
>> >> >> >
>> >> >> > _______________________________________________
>> >> >> > ceph-users mailing list
>> >> >> > ceph-users at lists.ceph.com
>> >> >> > http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
>> >> >>
>> >> >>
>> >> >>
>> >> >> --
>> >> >> Thank you!
>> >> >> HuangJun
>> >>
>> >>
>> >>
>> >> --
>> >> Thank you!
>> >> HuangJun
>>
>>
>>
>> --
>> Thank you!
>> HuangJun
>>
>
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