On 11/03/2016 01:24 PM, Wido den Hollander wrote:
Op 3 november 2016 om 13:09 schreef Joao Eduardo Luis <joao@xxxxxxx>:
On 11/03/2016 09:40 AM, Wido den Hollander wrote:
root@mon3:/var/lib/ceph/mon# ceph-monstore-tool ceph-mon3 dump-keys|awk '{print $1}'|uniq -c
96 auth
1143 logm
3 mdsmap
1 mkfs
1 mon_sync
6 monitor
3 monmap
1158 osdmap
358364 paxos
656 pgmap
6 pgmap_meta
168 pgmap_osd
6144 pgmap_pg
root@mon3:/var/lib/ceph/mon#
So there are 358k Paxos entries in the Mon store.
Any suggestions on how to trim those from the MON store(s)?
Can you check the value of paxos:first_committed in the store?
Here you go:
root@mon3:~# ceph-monstore-tool /var/lib/ceph/mon/ceph-mon3 show-versions --map-type paxos
first committed: 174349108
last committed: 174349609
root@mon3:~#
Doesn't seem like a lot of keys in there?
I have this annoying feeling that this relates to some really old bug I
can't really recall the ticket number, but in essence was not trimming
the maps even though first_committed was updated.
The one way out of this I can think of is to change the value of
'first_committed' in the store to the very first paxos epoch you have.
You will have to use 'ceph_kvstore_tool' to do that.
This approach presumes your leader also has the same number of maps
(because, otherwise, the monitor would not sync bajillions of useless
maps), and that the version trim will then also be committed by the peons.
-Joao
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