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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