[Sheepdog] Sheepdog 0.3.0 schedule and 0.4.0 plan

[Yibin Shen]

On Tue, Nov 15, 2011 at 6:49 PM, Liu Yuan <namei.unix at gmail.com> wrote:
> On 11/15/2011 06:34 PM, Yibin Shen wrote:
>
>> On Tue, Nov 15, 2011 at 6:16 PM, MORITA Kazutaka
>> <morita.kazutaka at lab.ntt.co.jp> wrote:
>>> At Tue, 15 Nov 2011 10:25:41 +0800,
>>> Yibin Shen wrote:
>>>>
>>>> Hi, kuzum:
>>>>
>>>> We wish to add other three features in 0.4.0 merge window,
>>>>
>>>> 1. object's R/W checksum support(which will be optional) for sheep I/O
>>>> subsystem.
>>>
>>> How to store the checksum?  Will this feature be implemented on Yuan's
>>> "farm"?
>> we will create a checksum file for each object, and named with object
>> name plus a  suffix,
>> hmm, maybe this is conflicted with "farm" project,  I will talked it with Yuan.
>
> Not at all. Farm doesn't do with raw object. You can play with it on
> farm as it is right now. But if we need checksum it, maybe we can create
> a header for object.
>
I don't think it's a good choice ,  that will make object hard to "decode"
> |header|data...|
>
> write(oid, buf, size)
> {
>        sha1 = get_sha1(buf, size);
>        init_hdr(sha1, size)
>        insert(buf, &hdr);
>        write_object(odi, buf, size);
> }
>
> read(oid, buf, size)
> {
>        sha1 = get_sha1(read_file(oid), size, &hdr);
>        verify_sha1(sha1, hdr.sha1);
>        ....
> }
>
> Thanks,
> Yuan
> --
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> sheepdog at lists.wpkg.org
> http://lists.wpkg.org/mailman/listinfo/sheepdog
>

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