Re: rename whilst in use

[Josh Durgin <josh.durgin@inktank.com>]

On 02/27/2013 10:01 PM, Wolfgang Hennerbichler wrote:
> On 02/27/2013 11:01 PM, Josh Durgin wrote:
>
>> Since it doesn't appear in rbd ls, this suggests that the old
>> rbd_id.mysql3 object still exists.
>
> Yes. Is there a way I can safely delete it?
>
> rados ls -p rd | grep mysql | less
> mysql3.rbd
> rbd_id.mysql3.new
>
> => here it is (and yes, it's format==1). can I just say rados rm ...
> without having to fear that everything breaks down?

If you've just had this problem with a format 1 image, you can safely
rados rm the old header (oldname.rbd). It's the only thing that wouldn't
be cleaned up by a rename while it's in use.

>>> unfortunately my scrollback buffer isn't long enough to find out about
>>> the actual error I got during the first rename, but it should be easy to
>>> reproduce.
>>
>> I can't reproduce it (at least not with format 2 images). Can you?
>
> I currently only have this production system to play, so I can't really
> try. but you're right, it's a format 1 image. (that was the use case, I
> tried to "convert" a format 1 image to a format 2 image by creating the
> .new and copying stuff over)
>
>> I'd expect this problem with format 1 images, since they don't separate
>> the header object from the name of the image.
>
> so true. :)
>
>> Thanks, it certainly seems like a bug.
>
> as it's a format==1 bug, maybe it's of less importance. so: is rados rm
> mysql3.rbd a good idea? :)

If mysql3 is the old name of the image that was renamed while in use,
yes.

>> Josh
>
> Wolfgang
>
> PS: I didn't receive mails (even not your reply) on the mailing-list for
> about 12 hours, did your mailserver break? Is your mailserver backed by
> ceph-fs? :)

Not yet :) I'm not sure why that happened, I didn't notice any issues
with vger or my other emails today.