Re: Updating standby mds from 12.2.2 to 12.2.4 caused up:active 12.2.2 mds's to suicide

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On Wed, Feb 28, 2018 at 11:38 AM, Patrick Donnelly <pdonnell@xxxxxxxxxx> wrote:
> On Wed, Feb 28, 2018 at 2:07 AM, Dan van der Ster <dan@xxxxxxxxxxxxxx> wrote:
>> (Sorry to spam)
>>
>> I guess it's related to this fix to the layout v2 feature id:
>> https://github.com/ceph/ceph/pull/18782/files
>>
>> -#define MDS_FEATURE_INCOMPAT_FILE_LAYOUT_V2 CompatSet::Feature(8,
>> "file layout v2")
>> +#define MDS_FEATURE_INCOMPAT_FILE_LAYOUT_V2 CompatSet::Feature(9,
>> "file layout v2")
>
> Yes, this looks to be the issue.
>
>> Is there a way to update from 12.2.2 without causing the other active
>> MDS's to suicide?
>
> I think it will be necessary to reduce the actives to 1 (max_mds -> 1;
> deactivate other ranks), shutdown standbys, upgrade the single active,
> then upgrade/start the standbys.
>
> Unfortunately this didn't get flagged in upgrade testing. Thanks for
> the report Dan.

Thanks Patrick -- that's a good idea to reduce to 1 active.
I've create http://tracker.ceph.com/issues/23172 in case any followup is needed.

Cheers, Dan
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