Re: Coupled Layer MSR: PR 14300, ECSubRead decode fail.

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Thanks Greg. We will do that!

On Mon, Apr 3, 2017 at 11:37 PM, Gregory Farnum <gfarnum@xxxxxxxxxx> wrote:
> On Mon, Apr 3, 2017 at 11:02 AM, Myna V <mynaramana@xxxxxxxxx> wrote:
>> Hello All,
>>
>> This is regarding the make check error in readable.sh
>>
>> https://jenkins.ceph.com/job/ceph-pull-requests/21319/
>>
>> We have added additional fields to the ECSubRead message type and
>> updated the encode, decode of ECSubRead message to incorporate the
>> newly added fields. The failure seems to happen when the object (older
>> ECSubRead) is being decoded with the new decode function as it is
>> expecting a larger buffer length.
>>
>> How do we update the test objects in ceph-object-corpus with these
>> added fields ?
>
> You don't! ceph-object-corpus exists to make sure that newer code can
> read older objects. You need to update the versions used in
> ENCODE_START/DECODE_START and branch internally based on the encoded
> object's struct_v member. I'm not sure if there are good examples of
> this in the EC utility functions yet, but if not you can check out
> osd_types.[h|cc] and the encoding.h macros being invoked. :)
> -Greg
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