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 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.

-- 
Patrick Donnelly
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