Re: _delete_some new onodes has appeared since PG removal started

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We saw this warning once in testing
(https://tracker.ceph.com/issues/49900#note-1), but there, the problem
was different, which also led to a crash. That issue has been fixed
but if you can provide osd logs with verbose logging, we might be able
to investigate further.

Neha

On Wed, Apr 14, 2021 at 4:14 PM Igor Fedotov <ifedotov@xxxxxxx> wrote:
>
> Hi Dan,
>
> Seen that once before and haven't thoroughly investigated yet but I
> think the new PG removal stuff just revealed this "issue". In fact it
> had been in the code before the patch.
>
> The warning means that new object(s) (given the object names these are
> apparently system objects, don't remember what's this exactly)  has been
> written to a PG after it was staged for removal.
>
> New PG removal properly handles that case - that was just a paranoid
> check for an unexpected situation which has actually triggered. Hence
> IMO no need to worry at this point but developers might want to validate
> why this is happening....
>
>
> Thanks,
>
> Igor
>
> On 4/14/2021 10:26 PM, Dan van der Ster wrote:
> > Hi Igor,
> >
> > After updating to 14.2.19 and then moving some PGs around we have a
> > few warnings related to the new efficient PG removal code, e.g. [1].
> > Is that something to worry about?
> >
> > Best Regards,
> >
> > Dan
> >
> > [1]
> >
> > /var/log/ceph/ceph-osd.792.log:2021-04-14 20:34:34.353 7fb2439d4700  0
> > osd.792 pg_epoch: 40906 pg[10.14b2s0( v 40734'290069
> > (33782'287000,40734'290069] lb MIN (bitwise) local-lis/les=33990/33991
> > n=36272 ec=4951/4937 lis/c 33990/33716 les/c/f 33991/33747/0
> > 40813/40813/37166) [933,626,260,804,503,491]p933(0) r=-1 lpr=40813
> > DELETING pi=[33716,40813)/4 crt=40734'290069 unknown NOTIFY mbc={}]
> > _delete_some additional unexpected onode list (new onodes has appeared
> > since PG removal started[0#10:4d280000::::head#]
> >
> > /var/log/ceph/ceph-osd.851.log:2021-04-14 18:40:13.312 7fd87bded700  0
> > osd.851 pg_epoch: 40671 pg[10.133fs5( v 40662'288967
> > (33782'285900,40662'288967] lb MIN (bitwise) local-lis/les=33786/33787
> > n=13 ec=4947/4937 lis/c 40498/33714 les/c/f 40499/33747/0
> > 40670/40670/33432) [859,199,913,329,439,79]p859(0) r=-1 lpr=40670
> > DELETING pi=[33714,40670)/4 crt=40662'288967 unknown NOTIFY mbc={}]
> > _delete_some additional unexpected onode list (new onodes has appeared
> > since PG removal started[5#10:fcc80000::::head#]
> >
> > /var/log/ceph/ceph-osd.851.log:2021-04-14 20:58:14.393 7fd87adeb700  0
> > osd.851 pg_epoch: 40906 pg[10.2e8s3( v 40610'288991
> > (33782'285900,40610'288991] lb MIN (bitwise) local-lis/les=33786/33787
> > n=161220 ec=4937/4937 lis/c 39826/33716 les/c/f 39827/33747/0
> > 40617/40617/39225) [717,933,727,792,607,129]p717(0) r=-1 lpr=40617
> > DELETING pi=[33716,40617)/3 crt=40610'288991 unknown NOTIFY mbc={}]
> > _delete_some additional unexpected onode list (new onodes has appeared
> > since PG removal started[3#10:17400000::::head#]
> >
> > /var/log/ceph/ceph-osd.883.log:2021-04-14 18:55:16.822 7f78c485d700  0
> > osd.883 pg_epoch: 40857 pg[7.d4( v 40804'9911289
> > (35835'9908201,40804'9911289] lb MIN (bitwise)
> > local-lis/les=40782/40783 n=195 ec=2063/1989 lis/c 40782/40782 les/c/f
> > 40783/40844/0 40781/40845/40845) [877,870,894] r=-1 lpr=40845 DELETING
> > pi=[40782,40845)/1 crt=40804'9911289 lcod 40804'9911288 unknown NOTIFY
> > mbc={}] _delete_some additional unexpected onode list (new onodes has
> > appeared since PG removal started[#7:2b000000::::head#]
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