On Wed, Oct 7, 2015 at 5:36 PM, Alex Elder <elder@xxxxxxxx> wrote:
> On 10/07/2015 12:02 PM, Ilya Dryomov wrote:
>> This covers only the simplest case - an object size sized write, but
>> it's still useful in tiering setups when EC is used for the base tier
>> as writefull op can be proxied, saving an object promotion.
>>
>> Even though updating ceph_osdc_new_request() to allow writefull should
>> just be a matter of fixing an assert, I didn't do it because its only
>> user is cephfs. All other sites were updated.
>>
>> Reflects ceph.git commit 7bfb7f9025a8ee0d2305f49bf0336d2424da5b5b.
>
> I haven't looked at this at all. But can you give me a
> short explanation of what "writefull" is?
>
> Full object write?
Well, in a way. It replaces previous data, you can think of it as an
atomic truncate to 0 + write from offset 0. So it always writes
(replaces) entire objects.
Thanks,
Ilya
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