Dear Cephers,
interestingly, after:
ceph device monitoring off
the mgrs seem to be stable now - the active one still went silent a few minutes later,
but the standby took over and was stable, and restarting the broken one, it's now stable since an hour, too,
so probably, a restart of the mgr is needed after disabling device monitoring to get things stable again.
So it seems to be caused by a problem with the device health metrics. In case this is a red herring and mgrs become instable again in the next days,
I'll let you know.
Cheers,
Oliver
Am 01.11.19 um 23:09 schrieb Oliver Freyermuth:
> Dear Cephers,
>
> this is a 14.2.4 cluster with device health metrics enabled - since about a day, all mgr daemons go "silent" on me after a few hours, i.e. "ceph -s" shows:
>
> cluster:
> id: 269cf2b2-7e7c-4ceb-bd1b-a33d915ceee9
> health: HEALTH_WARN
> no active mgr
> 1/3 mons down, quorum mon001,mon002
>
> services:
> mon: 3 daemons, quorum mon001,mon002 (age 57m), out of quorum: mon003
> mgr: no daemons active (since 56m)
> ...
> (the third mon has a planned outage and will come back in a few days)
>
> Checking the logs of the mgr daemons, I find some "reset" messages at the time when it goes "silent", first for the first mgr:
>
> 2019-11-01 21:34:40.286 7f2df6a6b700 0 log_channel(cluster) log [DBG] : pgmap v1798: 1585 pgs: 1585 active+clean; 1.1 TiB data, 2.3 TiB used, 136 TiB / 138 TiB avail
> 2019-11-01 21:34:41.458 7f2e0d59b700 0 client.0 ms_handle_reset on v2:10.160.16.1:6800/401248
> 2019-11-01 21:34:42.287 7f2df6a6b700 0 log_channel(cluster) log [DBG] : pgmap v1799: 1585 pgs: 1585 active+clean; 1.1 TiB data, 2.3 TiB used, 136 TiB / 138 TiB avail
>
> and a bit later, on the standby mgr:
>
> 2019-11-01 22:18:14.892 7f7bcc8ae700 0 log_channel(cluster) log [DBG] : pgmap v1798: 1585 pgs: 166 active+clean+snaptrim, 858 active+clean+snaptrim_wait, 561 active+clean; 1.1 TiB data, 2.3 TiB used, 136 TiB / 138 TiB avail
> 2019-11-01 22:18:16.022 7f7be9e72700 0 client.0 ms_handle_reset on v2:10.160.16.2:6800/352196
> 2019-11-01 22:18:16.893 7f7bcc8ae700 0 log_channel(cluster) log [DBG] : pgmap v1799: 1585 pgs: 166 active+clean+snaptrim, 858 active+clean+snaptrim_wait, 561 active+clean; 1.1 TiB data, 2.3 TiB used, 136 TiB / 138 TiB avail
>
> Interestingly, the dashboard still works, but presents outdated information, and for example zero I/O going on.
> I believe this started to happen mainly after the third mon went into the known downtime, but I am not fully sure if this was the trigger, since the cluster is still growing.
> It may also have been the addition of 24 more OSDs.
>
>
> I also find other messages in the mgr logs which seem problematic, but I am not sure they are related:
> ------------------------------
> 2019-11-01 21:17:09.849 7f2df4266700 0 mgr[devicehealth] Error reading OMAP: [errno 22] Failed to operate read op for oid
> Traceback (most recent call last):
> File "/usr/share/ceph/mgr/devicehealth/module.py", line 396, in put_device_metrics
> ioctx.operate_read_op(op, devid)
> File "rados.pyx", line 516, in rados.requires.wrapper.validate_func (/home/jenkins-build/build/workspace/ceph-build/ARCH/x86_64/AVAILABLE_ARCH/x86_64/AVAILABLE_DIST/centos7/DIST/centos7/MACHINE_SIZE/huge/release/14.2.4/rpm/el7/BUIL
> D/ceph-14.2.4/build/src/pybind/rados/pyrex/rados.c:4721)
> File "rados.pyx", line 3474, in rados.Ioctx.operate_read_op (/home/jenkins-build/build/workspace/ceph-build/ARCH/x86_64/AVAILABLE_ARCH/x86_64/AVAILABLE_DIST/centos7/DIST/centos7/MACHINE_SIZE/huge/release/14.2.4/rpm/el7/BUILD/ceph-14.2.4/build/src/pybind/rados/pyrex/rados.c:36554)
> InvalidArgumentError: [errno 22] Failed to operate read op for oid
> ------------------------------
> or:
> ------------------------------
> 2019-11-01 21:33:53.977 7f7bd38bc700 0 mgr[devicehealth] Fail to parse JSON result from daemon osd.51 ()
> 2019-11-01 21:33:53.978 7f7bd38bc700 0 mgr[devicehealth] Fail to parse JSON result from daemon osd.52 ()
> 2019-11-01 21:33:53.979 7f7bd38bc700 0 mgr[devicehealth] Fail to parse JSON result from daemon osd.53 ()
> ------------------------------
>
> The reason why I am cautious about the health metrics is that I observed a crash when trying to query them:
> ------------------------------
> 2019-11-01 20:21:23.661 7fa46314a700 0 log_channel(audit) log [DBG] : from='client.174136 -' entity='client.admin' cmd=[{"prefix": "device get-health-metrics", "devid": "osd.11", "target": ["mgr", ""]}]: dispatch
> 2019-11-01 20:21:23.661 7fa46394b700 0 mgr[devicehealth] handle_command
> 2019-11-01 20:21:23.663 7fa46394b700 -1 *** Caught signal (Segmentation fault) **
> in thread 7fa46394b700 thread_name:mgr-fin
>
> ceph version 14.2.4 (75f4de193b3ea58512f204623e6c5a16e6c1e1ba) nautilus (stable)
> 1: (()+0xf5f0) [0x7fa488cee5f0]
> 2: (PyEval_EvalFrameEx()+0x1a9) [0x7fa48aeb50f9]
> 3: (PyEval_EvalFrameEx()+0x67bd) [0x7fa48aebb70d]
> 4: (PyEval_EvalFrameEx()+0x67bd) [0x7fa48aebb70d]
> 5: (PyEval_EvalFrameEx()+0x67bd) [0x7fa48aebb70d]
> 6: (PyEval_EvalCodeEx()+0x7ed) [0x7fa48aebe08d]
> 7: (()+0x709c8) [0x7fa48ae479c8]
> 8: (PyObject_Call()+0x43) [0x7fa48ae22ab3]
> 9: (()+0x5aaa5) [0x7fa48ae31aa5]
> 10: (PyObject_Call()+0x43) [0x7fa48ae22ab3]
> 11: (()+0x4bb95) [0x7fa48ae22b95]
> 12: (PyObject_CallMethod()+0xbb) [0x7fa48ae22ecb]
> 13: (ActivePyModule::handle_command(std::map<std::string, boost::variant<std::string, bool, long, double, std::vector<std::string, std::allocator<std::string> >, std::vector<long, std::allocator<long> >, std::vector<double, std::allocator<double> > >, std::less<void>, std::allocator<std::pair<std::string const, boost::variant<std::string, bool, long, double, std::vector<std::string, std::allocator<std::string> >, std::vector<long, std::allocator<long> >, std::vector<double, std::allocator<double> > > > > > const&, ceph::buffer::v14_2_0::list const&, std::basic_stringstream<char, std::char_traits<char>, std::allocator<char> >*, std::basic_stringstream<char, std::char_traits<char>, std::allocator<char> >*)+0x20e) [0x55c3c1fefc5e]
> 14: (()+0x16c23d) [0x55c3c204023d]
> 15: (FunctionContext::finish(int)+0x2c) [0x55c3c2001eac]
> 16: (Context::complete(int)+0x9) [0x55c3c1ffe659]
> 17: (Finisher::finisher_thread_entry()+0x156) [0x7fa48b439cc6]
> 18: (()+0x7e65) [0x7fa488ce6e65]
> 19: (clone()+0x6d) [0x7fa48799488d]
> NOTE: a copy of the executable, or `objdump -rdS <executable>` is needed to interpret this.
> ------------------------------
>
> I have issued:
> ceph device monitoring off
> for now and will keep waiting to see if mgrs go silent again. If there are any better ideas or this issue is known, let me know.
>
> Cheers,
> Oliver
>
>
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