Thanks, Yehuda, for your reply. I think you may be right because I did another experiment which seems there might be a reference to an object. I am just curious to do that for some corner case.
On Tue, Oct 15, 2013 at 12:39 AM, Yehuda Sadeh <yeh...@inktank.com> wrote: > On Mon, Oct 14, 2013 at 4:04 AM, david zhang <zhang.david2...@gmail.com> > wrote: > > Hi ceph-users, > > > > I uploaded an object successfully to radosgw with 3 replicas. And I > located > > all the physical paths of 3 replicas on different OSDs. > > > > i.e, one of the 3 physical paths is > > > /var/lib/ceph/osd/ceph-2/current/3.5_head/DIR_D/default.4896.65\\u20131014\\u1__head_0646563D__3 > > > > Then I manually deleted all the 3 replica files on OSDs, but this object > can > > still get from radosgw with http code 200 even I cleaned all the caches > on > > both radosgw and OSDs by 'echo 3 > /proc/sys/vm/drop_caches'. Only after > I > > restarted the 3 OSDs, get request will return 404. > > > > What did I miss? Is it not right to clean cache in that way? > > I'm not too sure what you're trying to achieve. You should never ever > access the osd objects directly like that. The reason you're still > able to read the objects is probably because the osd keeps open fds > for recently opened files and it still holds a reference to them. If > you need to remove objects off the rados backend you should use the > rados tool to do that. However, since you created the objects via > radosgw, you're going to have some radosgw consistency issues, so in > that case the way to go would be by going through radosgw-admin (or > through the radosgw RESTful api). > > > Yehuda > -- Regards, Zhi
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