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@xxxxxxx/thread/NG56XXAM5A4JONT4BGPQAZUTJAYMOSZ2/) 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@xxxxxxxxx> wrote: > > 2021年5月21日(金) 12:26 Satoru Takeuchi <satoru.takeuchi@xxxxxxxxx>: > > > > 2021年5月18日(火) 14:09 Satoru Takeuchi <satoru.takeuchi@xxxxxxxxx>: > >> > >> 2021年5月18日(火) 9:23 Satoru Takeuchi <satoru.takeuchi@xxxxxxxxx>: > >> > > >> > 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-investigation-and-guidance > >> > > >> > > 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@xxxxxxx > To unsubscribe send an email to ceph-users-leave@xxxxxxx _______________________________________________ ceph-users mailing list -- ceph-users@xxxxxxx To unsubscribe send an email to ceph-users-leave@xxxxxxx
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