I first had that problem on Giant, only upgraded to 0.94.3 in hopes it will eat less RAM On Mon, 7 Sep 2015 20:51:57 +0800, 池信泽 <xmdxcxz@xxxxxxxxx> wrote: > Yeh, There is bug which would use huge memory. It be triggered when osd > down or add into cluster and do recovery/backfilling. > > The patch https://github.com/ceph/ceph/pull/5656 > https://github.com/ceph/ceph/pull/5451 merged into master would fix it, and > it would be backport. > > I think ceph v0.93 or newer version maybe hit this bug. > > 2015-09-07 20:42 GMT+08:00 Shinobu Kinjo <skinjo@xxxxxxxxxx>: > > > How heavy network traffic was? > > > > Have you tried to capture that traffic between cluster and public network > > to see where such a bunch of traffic came from? > > > > Shinobu > > > > ----- Original Message ----- > > From: "Jan Schermer" <jan@xxxxxxxxxxx> > > To: "Mariusz Gronczewski" <mariusz.gronczewski@xxxxxxxxxxxx> > > Cc: ceph-users@xxxxxxxxxxxxxx > > Sent: Monday, September 7, 2015 9:17:04 PM > > Subject: Re: Huge memory usage spike in OSD on hammer/giant > > > > Hmm, even network traffic went up. > > Nothing in logs on the mons which started 9/4 ~6 AM? > > > > Jan > > > > > On 07 Sep 2015, at 14:11, Mariusz Gronczewski < > > mariusz.gronczewski@xxxxxxxxxxxx> wrote: > > > > > > On Mon, 7 Sep 2015 13:44:55 +0200, Jan Schermer <jan@xxxxxxxxxxx> wrote: > > > > > >> Maybe some configuration change occured that now takes effect when you > > start the OSD? > > >> Not sure what could affect memory usage though - some ulimit values > > maybe (stack size), number of OSD threads (compare the number from this OSD > > to the rest of OSDs), fd cache size. Look in /proc and compare everything. > > >> Also look in "ceph osd tree" - didn't someone touch it while you were > > gone? > > >> > > >> Jan > > >> > > > > > >> number of OSD threads (compare the number from this OSD to the rest of > > > OSDs), > > > > > > it occured on all OSDs, and it looked like that > > > http://imgur.com/IIMIyRG > > > > > > sadly I was on vacation so I didnt manage to catch it before ;/ but I'm > > > sure there was no config change > > > > > > > > >>> On 07 Sep 2015, at 13:40, Mariusz Gronczewski < > > mariusz.gronczewski@xxxxxxxxxxxx> wrote: > > >>> > > >>> On Mon, 7 Sep 2015 13:02:38 +0200, Jan Schermer <jan@xxxxxxxxxxx> > > wrote: > > >>> > > >>>> Apart from bug causing this, this could be caused by failure of other > > OSDs (even temporary) that starts backfills. > > >>>> > > >>>> 1) something fails > > >>>> 2) some PGs move to this OSD > > >>>> 3) this OSD has to allocate memory for all the PGs > > >>>> 4) whatever fails gets back up > > >>>> 5) the memory is never released. > > >>>> > > >>>> A similiar scenario is possible if for example someone confuses "ceph > > osd crush reweight" with "ceph osd reweight" (yes, this happened to me :-)). > > >>>> > > >>>> Did you try just restarting the OSD before you upgraded it? > > >>> > > >>> stopped, upgraded, started. it helped a bit ( <3GB per OSD) but beside > > >>> that nothing changed. I've tried to wait till it stops eating CPU then > > >>> restart it but it still eats >2GB of memory which means I can't start > > >>> all 4 OSDs at same time ;/ > > >>> > > >>> I've also added noin,nobackfill,norecover flags but that didnt help > > >>> > > >>> it is suprising for me because before all 4 OSDs total ate less than > > >>> 2GBs of memory so I though I have enough headroom, and we did restart > > >>> machines and removed/added os to test if recovery/rebalance goes fine > > >>> > > >>> it also does not have any external traffic at the moment > > >>> > > >>> > > >>>>> On 07 Sep 2015, at 12:58, Mariusz Gronczewski < > > mariusz.gronczewski@xxxxxxxxxxxx> wrote: > > >>>>> > > >>>>> Hi, > > >>>>> > > >>>>> over a weekend (was on vacation so I didnt get exactly what happened) > > >>>>> our OSDs started eating in excess of 6GB of RAM (well RSS), which > > was a > > >>>>> problem considering that we had only 8GB of ram for 4 OSDs (about 700 > > >>>>> pgs per osd and about 70GB space used. So spam of coredumps and OOMs > > >>>>> blocked the osds down to unusabiltity. > > >>>>> > > >>>>> I then upgraded one of OSDs to hammer which made it a bit better > > (~2GB > > >>>>> per osd) but still much higher usage than before. > > >>>>> > > >>>>> any ideas what would be a reason for that ? logs are mostly full on > > >>>>> OSDs trying to recover and timed out heartbeats > > >>>>> > > >>>>> -- > > >>>>> Mariusz Gronczewski, Administrator > > >>>>> > > >>>>> Efigence S. A. > > >>>>> ul. Wołoska 9a, 02-583 Warszawa > > >>>>> T: [+48] 22 380 13 13 > > >>>>> F: [+48] 22 380 13 14 > > >>>>> E: mariusz.gronczewski@xxxxxxxxxxxx > > >>>>> <mailto:mariusz.gronczewski@xxxxxxxxxxxx> > > >>>>> _______________________________________________ > > >>>>> ceph-users mailing list > > >>>>> ceph-users@xxxxxxxxxxxxxx > > >>>>> http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com > > >>>> > > >>> > > >>> > > >>> > > >>> -- > > >>> Mariusz Gronczewski, Administrator > > >>> > > >>> Efigence S. A. > > >>> ul. Wołoska 9a, 02-583 Warszawa > > >>> T: [+48] 22 380 13 13 > > >>> F: [+48] 22 380 13 14 > > >>> E: mariusz.gronczewski@xxxxxxxxxxxx > > >>> <mailto:mariusz.gronczewski@xxxxxxxxxxxx> > > >> > > > > > > > > > > > > -- > > > Mariusz Gronczewski, Administrator > > > > > > Efigence S. A. > > > ul. Wołoska 9a, 02-583 Warszawa > > > T: [+48] 22 380 13 13 > > > F: [+48] 22 380 13 14 > > > E: mariusz.gronczewski@xxxxxxxxxxxx > > > <mailto:mariusz.gronczewski@xxxxxxxxxxxx> > > > > _______________________________________________ > > ceph-users mailing list > > ceph-users@xxxxxxxxxxxxxx > > http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com > > _______________________________________________ > > ceph-users mailing list > > ceph-users@xxxxxxxxxxxxxx > > http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com > > > > > -- Mariusz Gronczewski, Administrator Efigence S. A. ul. Wołoska 9a, 02-583 Warszawa T: [+48] 22 380 13 13 F: [+48] 22 380 13 14 E: mariusz.gronczewski@xxxxxxxxxxxx <mailto:mariusz.gronczewski@xxxxxxxxxxxx>
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