24 May
2021
24 May
'21
3:32 p.m.
Hi Satoru,
Writes to a bucket are blocked while it is resharding, reads aren't.
Dynamic bucket resharding just means that it's automatically scheduled
for resharding once it reaches ~100k objects/shard
There were some discussions around non-blocking resharding operations
(https://lists.ceph.io/hyperkitty/list/dev@ceph.io/thread/NG56XXAM5A4JONT4BG…)
but I don't know what Ceph release this is planned for.
On Sun, May 23, 2021 at 9:23 PM Satoru Takeuchi
<satoru.takeuchi(a)gmail.com> wrote:
>
> 2021年5月21日(金) 12:26 Satoru Takeuchi <satoru.takeuchi(a)gmail.com>om>:
> >
> > 2021年5月18日(火) 14:09 Satoru Takeuchi <satoru.takeuchi(a)gmail.com>om>:
> >>
> >> 2021年5月18日(火) 9:23 Satoru Takeuchi <satoru.takeuchi(a)gmail.com>om>:
> >> >
> >> > Hi,
> >> >
> >> > I have a Ceph cluster used for RGW and RBD. I found that all I/Os to
> >> > RGW seemed to be
> >> > blocked while dynamic resharding. Could you tell me whether this
> >> > behavior is by design or not?
> >> >
> >> > I attached a graph which means I/O seemed to be blocked. Here x-axis
> >> > is time and y-axis
> >> > is the number of RADOS objects. In addition, dynamic resharding was
> >> > run between 16:22:30 and 16:31:30.
> >>
> >> I uploaded my image to google photos (thank you Anthony to point it out).
> >
> > Can someone please answer this question? I can show you more detailed
information if desired.
>
> I submitted an issue for this problem.
>
> https://tracker.ceph.com/issues/50945
>
> Thanks,
> Satoru
>
> >
> >>
> >>
> >> https://photos.app.goo.gl/ZFJg7CQ4z6gfqmSX6
> >>
> >> >
> >> > I read the official documents about dynamic resharding. But there is
> >> > no description about blocking during dynamic resharding.
> >> >
> >> > https://docs.ceph.com/en/octopus/radosgw/dynamicresharding/
> >> >
> >> > In addition, I read the following Red Hat's blog post.
> >> >
> >> >
https://www.redhat.com/ja/blog/ceph-rgw-dynamic-bucket-sharding-performance…
> >> >
> >> > > You do not need to stop reading or writing objects to the bucket
while resharding is happening.
> >> >
> >> > It would mean the dynamic resharding is online operation. However,
> >> > it's not clear whether this feature blocks I/Os or not.
> >> >
> >> > Thanks,
> >> > Satoru
> _______________________________________________
> ceph-users mailing list -- ceph-users(a)ceph.io
> To unsubscribe send an email to ceph-users-leave(a)ceph.io