Re: Monitors stores not trimming after upgrade from Dumpling to Hammer

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On Thu, Nov 3, 2016 at 11:57 AM, Wido den Hollander <wido@xxxxxxxx> wrote:
>
>> Op 3 november 2016 om 10:46 schreef Wido den Hollander <wido@xxxxxxxx>:
>>
>>
>>
>> > Op 3 november 2016 om 10:42 schreef Dan van der Ster <dan@xxxxxxxxxxxxxx>:
>> >
>> >
>> > Hi Wido,
>> >
>> > AFAIK mon's won't trim while a cluster is in HEALTH_WARN. Unset
>> > noscrub,nodeep-scrub, get that 3rd mon up, then it should trim.
>> >
>>
>> The 3rd MON is back, but afaik the MONs trim when all PGs are active+clean. A cluster can go into WARN state for almost any reason, eg old CRUSH tunables.
>>
>> Will give it a try though.
>
> No, it didn't. Health is OK, but still, the MON stores will not trim. A manual compaction actually grew the store from 25GB to 39GB.
>
> They keep having a high amount of Paxos keys in the MON stores.
>

How does the min_last_epoch_clean (from ceph pg dump) compare with
your current osdmap epoch? That will confirm if it *should* trim.

Note that, AFAICT, ceph pg dump only gives the correct
min_last_epoch_clean if you ask the mon leader. Peons always return 0,
for some reason.

Cheers, Dan
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