That portion of the log confused me, too.  However, I had run the same upgrade 
process on the MDS as all the other cluster components.  Firefly was actually 
installed on the MDS even though the log mentions 0.72.2.

At any rate, I ended up stopping the MDS and using 'newfs' on the metadata and 
data pools to eliminate the HEALTH_WARN issue.

-----Original Message-----
From: Gregory Farnum [mailto:[email protected]] 
Sent: Thursday, September 11, 2014 2:09 PM
To: McNamara, Bradley
Cc: [email protected]
Subject: Re: [ceph-users] Upgraded now MDS won't start

On Wed, Sep 10, 2014 at 4:24 PM, McNamara, Bradley 
<[email protected]> wrote:
> Hello,
>
> This is my first real issue since running Ceph for several months.  Here's 
> the situation:
>
> I've been running an Emperor cluster for several months.  All was good.  I 
> decided to upgrade since I'm running Ubuntu 13.10 and 0.72.2.  I decided to 
> first upgrade Ceph to 0.80.4, which was the last version in the apt 
> repository for 13.10.  I upgrade the MON's, then the OSD servers to 0.80.4; 
> all went as expected with no issues.  The last thing I did was upgrade the 
> MDS using the same process, but now the MDS won't start.  I've tried to 
> manually start the MDS with debugging on, and I have attached the file.  It 
> complains that it's looking for "mds.0.20  need osdmap epoch 3602, have 3601".
>
> Anyway, I'd don't really use CephFS or RGW, so I don't need the MDS, but I'd 
> like to have it.  Can someone tell me how to fix it, or delete it, so I can 
> start over when I do need it?  Right now my cluster is HEALTH_WARN because of 
> it.

Uh, the log is from an MDS running Emperor. That one looks like it's 
complaining because the mds data formats got updated for Firefly. ;) You'll 
need to run debugging from a Firefly mds to try and get something useful.
-Greg
Software Engineer #42 @ http://inktank.com | http://ceph.com
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