Hi Shylesh,
The following script reproduces the problem: obj3 is promoted and never evicted
rados -p slow get obj3 /tmp/obj3
Running the same command again somehow fixes the situation and obj3 is evicted. Reading again, obj3 is no longer evicted. I'll create a bug report out of this.
Thanks for your patience :-)
./stop.sh
rm -fr out dev ; MON=1 OSD=3 ./vstart.sh -X -d -n -l mon osd
ceph osd pool create slow 1 1
ceph osd pool create fast 1 1
ceph osd tier add slow fast
ceph osd tier cache-mode fast writeback
ceph osd tier set-overlay slow fast
ceph osd pool set fast hit_set_type bloom
ceph osd pool set fast cache_target_dirty_ratio 0.05
ceph osd pool set fast cache_min_flush_age 300
rados -p slow put obj1 /etc/group
rados -p slow put obj2 /etc/group
rados -p slow put obj3 /etc/group
ceph osd pool set fast cache_target_dirty_ratio .5
ceph osd pool set fast cache_target_full_ratio .8
ceph osd pool set fast target_max_objects 1
ceph osd pool set fast hit_set_count 1
ceph osd pool set fast hit_set_period 5
sleep 30
ceph df
rados -p slow get obj3 /tmp/obj3
ceph df
sleep 30
ceph df
ceph health detail
On 11/08/2015 16:58, Loic Dachary wrote:
> Looks like these 8 objects really are hit set archives:
>
> $ sudo rados --namespace .ceph-internal -p fast ls
> hit_set_4.3_archive_2015-08-10 14:21:26.133292_2015-08-11 10:42:57.463074
> hit_set_4.4_archive_2015-08-10 14:46:52.626962_2015-08-11 07:12:21.654410
> hit_set_4.b_archive_2015-08-10 14:21:32.897661_2015-08-11 10:42:30.888782
> hit_set_4.2c_archive_2015-08-10 08:29:09.218604_2015-08-10 08:29:14.782606
> hit_set_4.63_archive_2015-08-11 06:52:25.052126_2015-08-11 07:12:21.776928
> hit_set_4.74_archive_2015-08-10 14:41:39.411882_2015-08-11 07:12:21.789545
> hit_set_4.7c_archive_2015-08-10 14:38:04.463447_2015-08-11 07:12:21.801581
> hit_set_4.7f_archive_2015-08-10 14:43:01.446562_2015-08-11 07:12:21.819104
>
>
> On 11/08/2015 16:52, Loic Dachary wrote:
>> Hi,
>>
>> In your cluster there is:
>>
>> GLOBAL:
>> SIZE AVAIL RAW USED %RAW USED
>> 8334G 8333G 1280M 0.02
>> POOLS:
>> NAME ID USED %USED MAX AVAIL OBJECTS
>> rbd 0 0 0 2777G 0
>> mypool 1 135 0 2777G 2
>> sample 2 0 0 1851G 0
>> slow 3 295M 0 1851G 84
>> fast 4 498 0 1851G 6
>>
>> After running
>>
>> rados -p fast cache-flush-evict-all
>>
>> Then I do the following:
>>
>> rados -p slow put loic1 /etc/group
>>
>> ceph df
>> fast 4 1371 0 1851G 8
>>
>> I'm assuming the extra object (6 objects + 1 for loic1 + 1 other ) is an internal hit set.
>>
>> rados -p slow put loic2 /etc/group
>>
>> ceph df
>> fast 4 1455 0 1851G 9
>>
>> There I have 2 objects in the fast pool. I sleep 120 seconds and I see it going back to 8
>>
>> ceph df
>> fast 4 666 0 1851G 8
>>
>> Which is consistent with the settings of the pool that only allow for one object to stay in the fast pool as reported with ceph report:
>>
>> {
>> "pool": 4,
>> "pool_name": "fast",
>> "flags": 9,
>> "flags_names": "hashpspool,incomplete_clones",
>> "type": 1,
>> "size": 3,
>> "min_size": 2,
>> "crush_ruleset": 1,
>> "object_hash": 2,
>> "pg_num": 128,
>> "pg_placement_num": 128,
>> "crash_replay_interval": 0,
>> "last_change": "79",
>> "last_force_op_resend": "0",
>> "auid": 0,
>> "snap_mode": "selfmanaged",
>> "snap_seq": 0,
>> "snap_epoch": 67,
>> "pool_snaps": [],
>> "removed_snaps": "[]",
>> "quota_max_bytes": 0,
>> "quota_max_objects": 0,
>> "tiers": [],
>> "tier_of": 3,
>> "read_tier": -1,
>> "write_tier": -1,
>> "cache_mode": "writeback",
>> "target_max_bytes": 1000,
>> "target_max_objects": 1,
>> "cache_target_dirty_ratio_micro": 500000,
>> "cache_target_full_ratio_micro": 800000,
>> "cache_min_flush_age": 300,
>> "cache_min_evict_age": 0,
>> "erasure_code_profile": "cache",
>> "hit_set_params": {
>> "type": "bloom",
>> "false_positive_probability": 0.050000,
>> "target_size": 0,
>> "seed": 0
>> },
>> "hit_set_period": 600,
>> "hit_set_count": 1,
>> "min_read_recency_for_promote": 0,
>> "stripe_width": 0,
>> "expected_num_objects": 0
>> }
>>
>> I'm not entirely sure the explanation for the remaining 6 objects (i.e. them being internal objects used to store the hit set) is right. Let say it is right, is there more unexplained behavior ?
>>
>> Cheers
>>
>> For the record: https://github.com/ceph/ceph/blob/hammer/src/osd/ReplicatedPG.cc#L10494 bool ReplicatedPG::agent_work
>>
>> On 11/08/2015 13:32, Loic Dachary wrote:
>>> Hi Shylesh,
>>>
>>>
>>> I ran the following on a hammer compiled from sources.
>>>
>>> ./stop.sh
>>> rm -fr out dev ; MON=1 OSD=3 ./vstart.sh -X -d -n -l mon osd
>>>
>>> ceph osd pool create slow 1 1
>>> ceph osd pool create fast 1 1
>>> ceph osd tier add slow fast
>>> ceph osd tier cache-mode fast writeback
>>> ceph osd tier set-overlay slow fast
>>> ceph osd pool set fast hit_set_type bloom
>>> ceph osd pool set fast cache_target_dirty_ratio 0.05
>>> ceph osd pool set fast cache_min_flush_age 300
>>> rados -p slow put obj1 /etc/group
>>> ceph osd pool set fast cache_target_dirty_ratio .5
>>> ceph osd pool set fast cache_target_full_ratio .8
>>> ceph osd pool set fast target_max_objects 1
>>> rados -p slow put obj2 /etc/group
>>> rados -p slow put obj3 /etc/group
>>> ceph osd pool set fast hit_set_count 1
>>> ceph osd pool set fast hit_set_period 5
>>> ceph osd pool set fast hit_set_period 600
>>>
>>> sleep 30
>>>
>>> ceph df
>>> ceph health detail
>>>
>>>
>>> and the output shows it works (see below). I'll try to figure out the difference with your cluster now that I have a baseline that does the right thing :-) If you can think of something else you did that may explain the failure, please let me know.
>>>
>>> $ bash -x /tmp/bug.sh
>>> + ./stop.sh
>>> + rm -fr out dev
>>> + MON=1
>>> + OSD=3
>>> + ./vstart.sh -X -d -n -l mon osd
>>> ** going verbose **
>>> ip 127.0.0.1
>>> port
>>>
>>> NOTE: hostname resolves to loopback; remote hosts will not be able to
>>> connect. either adjust /etc/hosts, or edit this script to use your
>>> machine's real IP.
>>>
>>> creating /home/loic/software/ceph/ceph/src/keyring
>>> ./monmaptool --create --clobber --add a 127.0.0.1:6789 --print /tmp/ceph_monmap.24142
>>> ./monmaptool: monmap file /tmp/ceph_monmap.24142
>>> ./monmaptool: generated fsid 1d4a5e92-e47c-4f79-9390-07614b8d261a
>>> epoch 0
>>> fsid 1d4a5e92-e47c-4f79-9390-07614b8d261a
>>> last_changed 2015-08-11 13:26:52.958438
>>> created 2015-08-11 13:26:52.958438
>>> 0: 127.0.0.1:6789/0 mon.a
>>> ./monmaptool: writing epoch 0 to /tmp/ceph_monmap.24142 (1 monitors)
>>> rm -rf /home/loic/software/ceph/ceph/src/dev/mon.a
>>> mkdir -p /home/loic/software/ceph/ceph/src/dev/mon.a
>>> ./ceph-mon --mkfs -c /home/loic/software/ceph/ceph/src/ceph.conf -i a --monmap=/tmp/ceph_monmap.24142 --keyring=/home/loic/software/ceph/ceph/src/keyring
>>> ./ceph-mon: set fsid to 87413c55-5249-4969-a8fe-f2768e5c59ce
>>> ./ceph-mon: created monfs at /home/loic/software/ceph/ceph/src/dev/mon.a for mon.a
>>> ./ceph-mon -i a -c /home/loic/software/ceph/ceph/src/ceph.conf
>>> ERROR: error accessing '/home/loic/software/ceph/ceph/src/dev/osd0/*'
>>> add osd0 8c8ac2c0-2426-42dd-ac43-c7b1a54a14bc
>>> *** DEVELOPER MODE: setting PATH, PYTHONPATH and LD_LIBRARY_PATH ***
>>> 0
>>> *** DEVELOPER MODE: setting PATH, PYTHONPATH and LD_LIBRARY_PATH ***
>>> add item id 0 name 'osd.0' weight 1 at location {host=fold,root=default} to crush map
>>> 2015-08-11 13:26:55.473416 7ff1bf4a07c0 -1 journal FileJournal::_open: disabling aio for non-block journal. Use journal_force_aio to force use of aio anyway
>>> 2015-08-11 13:26:56.462509 7ff1bf4a07c0 -1 journal FileJournal::_open: disabling aio for non-block journal. Use journal_force_aio to force use of aio anyway
>>> 2015-08-11 13:26:56.480075 7ff1bf4a07c0 -1 filestore(/home/loic/software/ceph/ceph/src/dev/osd0) could not find 23c2fcde/osd_superblock/0//-1 in index: (2) No such file or directory
>>> 2015-08-11 13:26:57.030312 7ff1bf4a07c0 -1 created object store /home/loic/software/ceph/ceph/src/dev/osd0 journal /home/loic/software/ceph/ceph/src/dev/osd0.journal for osd.0 fsid 87413c55-5249-4969-a8fe-f2768e5c59ce
>>> 2015-08-11 13:26:57.030372 7ff1bf4a07c0 -1 auth: error reading file: /home/loic/software/ceph/ceph/src/dev/osd0/keyring: can't open /home/loic/software/ceph/ceph/src/dev/osd0/keyring: (2) No such file or directory
>>> 2015-08-11 13:26:57.030471 7ff1bf4a07c0 -1 created new key in keyring /home/loic/software/ceph/ceph/src/dev/osd0/keyring
>>> adding osd0 key to auth repository
>>> *** DEVELOPER MODE: setting PATH, PYTHONPATH and LD_LIBRARY_PATH ***
>>> added key for osd.0
>>> start osd0
>>> ./ceph-osd -i 0 -c /home/loic/software/ceph/ceph/src/ceph.conf
>>> starting osd.0 at :/0 osd_data /home/loic/software/ceph/ceph/src/dev/osd0 /home/loic/software/ceph/ceph/src/dev/osd0.journal
>>> ERROR: error accessing '/home/loic/software/ceph/ceph/src/dev/osd1/*'
>>> add osd1 a57e7891-c8ca-4a59-92fa-6f65f681a560
>>> *** DEVELOPER MODE: setting PATH, PYTHONPATH and LD_LIBRARY_PATH ***
>>> 1
>>> *** DEVELOPER MODE: setting PATH, PYTHONPATH and LD_LIBRARY_PATH ***
>>> add item id 1 name 'osd.1' weight 1 at location {host=fold,root=default} to crush map
>>> 2015-08-11 13:27:00.350457 7fc4aa2507c0 -1 journal FileJournal::_open: disabling aio for non-block journal. Use journal_force_aio to force use of aio anyway
>>> 2015-08-11 13:27:01.104445 7fc4aa2507c0 -1 journal FileJournal::_open: disabling aio for non-block journal. Use journal_force_aio to force use of aio anyway
>>> 2015-08-11 13:27:01.117456 7fc4aa2507c0 -1 filestore(/home/loic/software/ceph/ceph/src/dev/osd1) could not find 23c2fcde/osd_superblock/0//-1 in index: (2) No such file or directory
>>> 2015-08-11 13:27:01.826145 7fc4aa2507c0 -1 created object store /home/loic/software/ceph/ceph/src/dev/osd1 journal /home/loic/software/ceph/ceph/src/dev/osd1.journal for osd.1 fsid 87413c55-5249-4969-a8fe-f2768e5c59ce
>>> 2015-08-11 13:27:01.826194 7fc4aa2507c0 -1 auth: error reading file: /home/loic/software/ceph/ceph/src/dev/osd1/keyring: can't open /home/loic/software/ceph/ceph/src/dev/osd1/keyring: (2) No such file or directory
>>> 2015-08-11 13:27:01.826277 7fc4aa2507c0 -1 created new key in keyring /home/loic/software/ceph/ceph/src/dev/osd1/keyring
>>> adding osd1 key to auth repository
>>> *** DEVELOPER MODE: setting PATH, PYTHONPATH and LD_LIBRARY_PATH ***
>>> added key for osd.1
>>> start osd1
>>> ./ceph-osd -i 1 -c /home/loic/software/ceph/ceph/src/ceph.conf
>>> starting osd.1 at :/0 osd_data /home/loic/software/ceph/ceph/src/dev/osd1 /home/loic/software/ceph/ceph/src/dev/osd1.journal
>>> ERROR: error accessing '/home/loic/software/ceph/ceph/src/dev/osd2/*'
>>> add osd2 f88f90e0-5796-479c-ac2b-9406f91e55cd
>>> *** DEVELOPER MODE: setting PATH, PYTHONPATH and LD_LIBRARY_PATH ***
>>> 2
>>> *** DEVELOPER MODE: setting PATH, PYTHONPATH and LD_LIBRARY_PATH ***
>>> add item id 2 name 'osd.2' weight 1 at location {host=fold,root=default} to crush map
>>> 2015-08-11 13:27:05.397800 7f4462e1b7c0 -1 journal FileJournal::_open: disabling aio for non-block journal. Use journal_force_aio to force use of aio anyway
>>> 2015-08-11 13:27:06.808009 7f4462e1b7c0 -1 journal FileJournal::_open: disabling aio for non-block journal. Use journal_force_aio to force use of aio anyway
>>> 2015-08-11 13:27:06.827479 7f4462e1b7c0 -1 filestore(/home/loic/software/ceph/ceph/src/dev/osd2) could not find 23c2fcde/osd_superblock/0//-1 in index: (2) No such file or directory
>>> 2015-08-11 13:27:08.451691 7f4462e1b7c0 -1 created object store /home/loic/software/ceph/ceph/src/dev/osd2 journal /home/loic/software/ceph/ceph/src/dev/osd2.journal for osd.2 fsid 87413c55-5249-4969-a8fe-f2768e5c59ce
>>> 2015-08-11 13:27:08.451731 7f4462e1b7c0 -1 auth: error reading file: /home/loic/software/ceph/ceph/src/dev/osd2/keyring: can't open /home/loic/software/ceph/ceph/src/dev/osd2/keyring: (2) No such file or directory
>>> 2015-08-11 13:27:08.454963 7f4462e1b7c0 -1 created new key in keyring /home/loic/software/ceph/ceph/src/dev/osd2/keyring
>>> adding osd2 key to auth repository
>>> *** DEVELOPER MODE: setting PATH, PYTHONPATH and LD_LIBRARY_PATH ***
>>> added key for osd.2
>>> start osd2
>>> ./ceph-osd -i 2 -c /home/loic/software/ceph/ceph/src/ceph.conf
>>> starting osd.2 at :/0 osd_data /home/loic/software/ceph/ceph/src/dev/osd2 /home/loic/software/ceph/ceph/src/dev/osd2.journal
>>> started. stop.sh to stop. see out/* (e.g. 'tail -f out/????') for debug output.
>>>
>>> export PYTHONPATH=./pybind
>>> export LD_LIBRARY_PATH=.libs
>>> + ceph osd pool create slow 1 1
>>> *** DEVELOPER MODE: setting PATH, PYTHONPATH and LD_LIBRARY_PATH ***
>>> pool 'slow' created
>>> + ceph osd pool create fast 1 1
>>> *** DEVELOPER MODE: setting PATH, PYTHONPATH and LD_LIBRARY_PATH ***
>>> pool 'fast' created
>>> + ceph osd tier add slow fast
>>> *** DEVELOPER MODE: setting PATH, PYTHONPATH and LD_LIBRARY_PATH ***
>>> pool 'fast' is now (or already was) a tier of 'slow'
>>> + ceph osd tier cache-mode fast writeback
>>> *** DEVELOPER MODE: setting PATH, PYTHONPATH and LD_LIBRARY_PATH ***
>>> set cache-mode for pool 'fast' to writeback
>>> + ceph osd tier set-overlay slow fast
>>> *** DEVELOPER MODE: setting PATH, PYTHONPATH and LD_LIBRARY_PATH ***
>>> overlay for 'slow' is now (or already was) 'fast'
>>> + ceph osd pool set fast hit_set_type bloom
>>> *** DEVELOPER MODE: setting PATH, PYTHONPATH and LD_LIBRARY_PATH ***
>>> set pool 2 hit_set_type to bloom
>>> + ceph osd pool set fast cache_target_dirty_ratio 0.05
>>> *** DEVELOPER MODE: setting PATH, PYTHONPATH and LD_LIBRARY_PATH ***
>>> set pool 2 cache_target_dirty_ratio to 0.05
>>> + ceph osd pool set fast cache_min_flush_age 300
>>> *** DEVELOPER MODE: setting PATH, PYTHONPATH and LD_LIBRARY_PATH ***
>>> set pool 2 cache_min_flush_age to 300
>>> + rados -p slow put obj1 /etc/group
>>> + ceph osd pool set fast cache_target_dirty_ratio .5
>>> *** DEVELOPER MODE: setting PATH, PYTHONPATH and LD_LIBRARY_PATH ***
>>> set pool 2 cache_target_dirty_ratio to .5
>>> + ceph osd pool set fast cache_target_full_ratio .8
>>> *** DEVELOPER MODE: setting PATH, PYTHONPATH and LD_LIBRARY_PATH ***
>>> set pool 2 cache_target_full_ratio to .8
>>> + ceph osd pool set fast target_max_objects 1
>>> *** DEVELOPER MODE: setting PATH, PYTHONPATH and LD_LIBRARY_PATH ***
>>> set pool 2 target_max_objects to 1
>>> + rados -p slow put obj2 /etc/group
>>> + rados -p slow put obj3 /etc/group
>>> + ceph osd pool set fast hit_set_count 1
>>> *** DEVELOPER MODE: setting PATH, PYTHONPATH and LD_LIBRARY_PATH ***
>>> set pool 2 hit_set_count to 1
>>> + ceph osd pool set fast hit_set_period 5
>>> *** DEVELOPER MODE: setting PATH, PYTHONPATH and LD_LIBRARY_PATH ***
>>> set pool 2 hit_set_period to 5
>>> + ceph osd pool set fast hit_set_period 600
>>> *** DEVELOPER MODE: setting PATH, PYTHONPATH and LD_LIBRARY_PATH ***
>>> set pool 2 hit_set_period to 600
>>> + sleep 30
>>> + ceph df
>>> *** DEVELOPER MODE: setting PATH, PYTHONPATH and LD_LIBRARY_PATH ***
>>> GLOBAL:
>>> SIZE AVAIL RAW USED %RAW USED
>>> 547G 56407M 491G 89.92
>>> POOLS:
>>> NAME ID USED %USED MAX AVAIL OBJECTS
>>> rbd 0 0 0 18801M 0
>>> slow 1 3834 0 18801M 3
>>> fast 2 0 0 18801M 0
>>> + ceph health detail
>>> *** DEVELOPER MODE: setting PATH, PYTHONPATH and LD_LIBRARY_PATH ***
>>> HEALTH_WARN 3 near full osd(s); mon.a low disk space
>>> osd.0 is near full at 89%
>>> osd.1 is near full at 89%
>>> osd.2 is near full at 89%
>>> mon.a low disk space -- 10% avail
>>>
>>>
>>
>
--
Loïc Dachary, Artisan Logiciel Libre
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