Regards,
Zhi Zhang (David)
Contact: zhang.david2011@xxxxxxxxx
zhangz.david@xxxxxxxxxxx
On Wed, Mar 2, 2016 at 6:32 PM, John Spray <jspray@xxxxxxxxxx> wrote:
> On Wed, Mar 2, 2016 at 9:05 AM, Zhi Zhang <zhang.david2011@xxxxxxxxx> wrote:
>> Hi Guys,
>>
>> Recently I am trying cache tier and if I try to stat a non-existent
>> object in both cache tier pool and base pool, I find cache tier will
>> not just return -ENOENT, but also create an empty object with setting
>> its flag as FLAG_WHITEOUT in cache tier pool.
>>
>> Although it indicates this object is not existed logically, why cache
>> tier will try to create it rather than only returning -ENOENT?
>
> I would imagine the logic is to cache the fact that the object doesn't
> exist, so that if the client repeatedly tries to fetch the
> non-existent object, it doesn't have to keep querying the backing pool
> to check.
>
thanks, you are right.
> John
>
>> Thanks.
>>
>> Regards,
>> Zhi Zhang (David)
>> Contact: zhang.david2011@xxxxxxxxx
>> zhangz.david@xxxxxxxxxxx
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