[ceph-users] Ceph-mgr summarize recovery counters

Benjeman Meekhof bmeekhof at umich.edu
Tue Oct 10 07:50:46 PDT 2017

Hi John,

Thanks for the guidance!  Is pg_status something we should expect to
find in Luminous (12.2.1)?  It doesn't seem to exist.  We do have a
'pg_summary' object which contains a list of every PG and current
state (active, etc) but nothing about I/O.

Calls to self.get('pg_status') in our module log:  mgr get_python
Python module requested unknown data 'pg_status'


On Thu, Oct 5, 2017 at 8:42 AM, John Spray <jspray at redhat.com> wrote:
> On Wed, Oct 4, 2017 at 7:14 PM, Gregory Farnum <gfarnum at redhat.com> wrote:
>> On Wed, Oct 4, 2017 at 9:14 AM, Benjeman Meekhof <bmeekhof at umich.edu> wrote:
>>> Wondering if anyone can tell me how to summarize recovery
>>> bytes/ops/objects from counters available in the ceph-mgr python
>>> interface?  To put another way, how does the ceph -s command put
>>> together that infomation and can I access that information from a
>>> counter queryable by the ceph-mgr python module api?
>>> I want info like the 'recovery' part of the status output.  I have a
>>> ceph-mgr module that feeds influxdb but I'm not sure what counters
>>> from ceph-mgr to summarize to create this information.  OSD have
>>> available a recovery_ops counter which is not quite the same.  Maybe
>>> the various 'subop_..' counters encompass recovery ops?  It's not
>>> clear to me but I'm hoping it is obvious to someone more familiar with
>>> the internals.
>>> io:
>>>     client:   2034 B/s wr, 0 op/s rd, 0 op/s wr
>>>     recovery: 1173 MB/s, 8 keys/s, 682 objects/s
>> You'll need to run queries against the PGMap. I'm not sure how that
>> works in the python interfaces but I'm led to believe it's possible.
>> Documentation is probably all in the PGMap.h header; you can look at
>> functions like the "recovery_rate_summary" to see what they're doing.
> Try get("pg_status") from a python module, that should contain the
> recovery/client IO amongst other things.
> You may find that the fields only appear when they're nonzero, I would
> be happy to see a change that fixed the underlying functions to always
> output the fields (e.g. in PGMapDigest::recovery_rate_summary) when
> writing to a Formatter.  Skipping the irrelevant stuff is only useful
> when doing plain text output.
> John
>> -Greg
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