Re: monitor not starting

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On Wednesday, July 4, 2012 at 10:02 AM, Smart Weblications GmbH - Florian Wiessner wrote:
> Am 04.07.2012 18:25, schrieb Gregory Farnum:
> >  
> >  
> > On Wednesday, July 4, 2012 at 4:45 AM, Smart Weblications GmbH - Florian Wiessner wrote:
> >  
> > > Hi List,
> > >  
> > >  
> > > i today upgraded from 0.43 to 0.48 and now i have one monitor which does not
> > > want to start up anymore:
> > >  
> > > ceph version 0.48argonaut-125-g4e774fb
> > > (commit:4e774fbcb38fd6883232b72352512a5f8e4a66e8)
> > > 1: /usr/bin/ceph-mon() [0x52f9c9]
> > > 2: (()+0xeff0) [0x7fb08dd11ff0]
> > > 3: (gsignal()+0x35) [0x7fb08c4f41b5]
> > > 4: (abort()+0x180) [0x7fb08c4f6fc0]
> > > 5: (__gnu_cxx::__verbose_terminate_handler()+0x115) [0x7fb08cd88dc5]
> > > 6: (()+0xcb166) [0x7fb08cd87166]
> > > 7: (()+0xcb193) [0x7fb08cd87193]
> > > 8: (()+0xcb28e) [0x7fb08cd8728e]
> > > 9: (ceph::__ceph_assert_fail(char const*, char const*, int, char const*)+0x940)
> > > [0x55b310]
> > > 10: /usr/bin/ceph-mon() [0x497317]
> > > 11: (Monitor::init()+0xc5a) [0x4857fa]
> > > 12: (main()+0x2789) [0x46ac79]
> > > 13: (__libc_start_main()+0xfd) [0x7fb08c4e0c8d]
> > > 14: /usr/bin/ceph-mon() [0x468309]
> > > NOTE: a copy of the executable, or `objdump -rdS <executable>` is needed to
> > > interpret this.
> > >  
> > > --- end dump of recent events ---
> > >  
> > >  
> > > How can i find out why it does not startup anymore? osd and mds is running fine..
> > Is that all the output you get? There should be a line somewhere which says what the assert is, and what line number it's on. :)
>  
>  
>  
>  
> Is this what you are looking for:
> 2012-07-04 11:20:24.448430 7f423d943780 1 mon.3@-1(probing) e1 init fsid
> 4553d0f6-1b31-4ba5-9d97-edae55bcaab4
> 2012-07-04 11:20:24.448994 7f423d943780 -1 mon/Paxos.cc (http://Paxos.cc): In function 'bool
> Paxos::is_consistent()' thread 7f423d943780 time 2012-07-04 11:20:24.448637
> mon/Paxos.cc (http://Paxos.cc): 1031: FAILED assert(consistent || (slurping == 1))

Yep, that line. This means the monitor's on-disk state is inconsistent, but I can think of a number of scenarios which could have caused this, depending on how you upgraded your cluster (older monitors didn't mark on-disk whenever they deliberately went inconsistent on a catchup, which I bet is what happened here).
  
> ceph version 0.48argonaut-125-g4e774fb
> (commit:4e774fbcb38fd6883232b72352512a5f8e4a66e8)
> 1: /usr/bin/ceph-mon() [0x497317]
> 2: (Monitor::init()+0xc5a) [0x4857fa]
> 3: (main()+0x2789) [0x46ac79]
> 4: (__libc_start_main()+0xfd) [0x7f423bcfbc8d]
> 5: /usr/bin/ceph-mon() [0x468309]
> NOTE: a copy of the executable, or `objdump -rdS <executable>` is needed to
> interpret this.
>  
> --- begin dump of recent events ---
> -3> 2012-07-04 11:20:24.447613 7f423d943780 1 store(/data/ceph/mon) mount
> -2> 2012-07-04 11:20:24.447722 7f423d943780 0 ceph version
> 0.48argonaut-125-g4e774fb (commit:4e774fbcb38fd6883232b72352512a5f8e4a66e8),
> process ceph-mon, pid 7436
> -1> 2012-07-04 11:20:24.448430 7f423d943780 1 mon.3@-1(probing) e1 init
> fsid 4553d0f6-1b31-4ba5-9d97-edae55bcaab4
> 0> 2012-07-04 11:20:24.448994 7f423d943780 -1 mon/Paxos.cc (http://Paxos.cc): In function
> 'bool Paxos::is_consistent()' thread 7f423d943780 time 2012-07-04 11:20:24.448637
> mon/Paxos.cc (http://Paxos.cc): 1031: FAILED assert(consistent || (slurping == 1))
>  
> ceph version 0.48argonaut-125-g4e774fb
> (commit:4e774fbcb38fd6883232b72352512a5f8e4a66e8)
> 1: /usr/bin/ceph-mon() [0x497317]
> 2: (Monitor::init()+0xc5a) [0x4857fa]
> 3: (main()+0x2789) [0x46ac79]
> 4: (__libc_start_main()+0xfd) [0x7f423bcfbc8d]
> 5: /usr/bin/ceph-mon() [0x468309]
> NOTE: a copy of the executable, or `objdump -rdS <executable>` is needed to
> interpret this.
>  
> --- end dump of recent events ---
> 2012-07-04 11:20:24.449567 7f423d943780 -1 *** Caught signal (Aborted) **
> in thread 7f423d943780
>  
>  
> >  
> > And while you're at it, is the rest of the cluster in fact working? I don't think 0.43 to 0.48 is an upgrade path we tested.
>  
> Anyway, i removed the mon and did a ceph-mon --mkfs with the 3 mons that were
> still working after the upgrade and got it up and running again.
>  
> Yes, the cluster is still working after the upgrade. Also upgraded to linux
> 3.4.4 - it feels like the ceph-fuse and kernel ceph client is a little less
> robust than in 0.43...
>  
> when i start copying from /ceph to other mp, then it seems that for the copy
> operation or in general for any operation, /ceph is unusable to other processes
> which then makes the client behave very sluggish... :(

Well, it shouldn't have gotten less stable since we haven't made any big changes there…but you aren't the only one reporting that things seem to be a little bit slower. We're going to have to look at that once people are back in the office after Independence Day.
  
>  
> i can send you the contents of the monitor directory where it did not work after
> the upgrade if you want me to..

No, that won't be necessary. Thanks though!  

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