Re: [Ceph-maintainers] v12.2.7 Luminous released

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On Wed, 18 Jul 2018, Linh Vu wrote:
> Thanks for all your hard work in putting out the fixes so quickly! :)
> 
> We have a cluster on 12.2.5 with Bluestore and EC pool but for CephFS, 
> not RGW. In the release notes, it says RGW is a risk especially the 
> garbage collection, and the recommendation is to either pause IO or 
> disable RGW garbage collection.
> 
> In our case with CephFS, not RGW, is it a lot less risky to perform the 
> upgrade to 12.2.7 without the need to pause IO?

It is hard to quantify.  I think we only saw the problem with RGW, but 
CephFS also sends deletes to non-existent objects when deleting or 
truncating sparse files.  Those are probably not too common in most 
environments...

> What does pause IO do? Do current sessions just get queued up and IO 
> resume normally with no problem after unpausing?

Exactly.  As long as the application doesn't have some timeout coded where 
it gives up when a read or write is taking to long, everything will just 
pause.

> If we have to pause IO, is it better to do something like: pause IO, 
> restart OSDs on one node, unpause IO - repeated for all the nodes 
> involved in the EC pool?

Yes, that sounds like a great way to proceed!

sage
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