Re: get_stats() on pool gives wrong number?

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On Thu, Feb 23, 2017 at 6:55 AM, Kent Borg <kentborg@xxxxxxxx> wrote:
> On 02/23/2017 07:43 AM, Kent Borg wrote:
>>
>> I ran a long list_objects() overnight and, at first glance this morning,
>> the output looks good, but it is thousands of objects fewer than get_stats()
>> said are there.
>
>
> Update: I scripted up a quick check and every object name I would expect to
> be in my pool is in the list_objects() output, no extra names are there, and
> the reported sizes are all reasonable.
>
> Yet get_stats() says there are thousands additional objects in that pool.
>
> It took some time to put all those objects in the pool, and for most of that
> time get_stats() did report the number I expected. But then, it differed...
>
> Is my cluster corrupted, is get_stats() sometimes (!) just a +/- 1%-ish
> estimate, or is my logic and use of Ceph wrong?

Did you run a pg split or something? That's the only off-hand way I
can think of the number of objects going over, though I don't recall
how snapshots impact those numbers and obviously it's very wonky if
you were to use a cache tier.
-Greg
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