Ceph » RADOS

From ML,

On 07/03/2018 05:55 AM, Sage Weil wrote:
> On Fri, 29 Jun 2018, Aleksei Gutikov wrote:
> > Throughput is 100% the same, just sliced into bigger chunks (rados objects).
> > And this throughput is not high, less than single object per second. And
> > memory stay occupied even after writing stopped.
> > 
> > Currently I'm sure that is side effect of sharing buffer::raw object among
> > different buffer::ptr objects.
> > 
> > Please, have a look into this dump of ObjectContext::attr_cache of one of
> > context in PrimaryLogPG::object_contexts, made after uploading single 4M
> > object into S3.
> > Notice "_user.rgw.idtag" and "_user.rgw.tail_tag" xattrs, both 44 bytes
> > length, holidng 4194304 bytes buffer::raw object (nref=2).
> 
> That is the smoking gun!  What version is this?

Particularly this dump from 12.2.2
But issue was also reproducible for 12.2.5 and master.