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From Schubert Zhang <zson...@gmail.com>
Subject Re: Question about hinted handoff
Date Sun, 11 Jul 2010 03:33:27 GMT
The answer of Benjamin is very right.

On Sun, Jul 11, 2010 at 6:27 AM, Benjamin Black <b@b3k.us> wrote:

> You constructed a pathological case and then got confused at the result.
>
> Consider instead a realistic case: RF=3, CL=QUORUM.  Writes should go
> to all of A, B, and C.  B is down when the write request arrives, so
> does not acknowledge the it.  A and C acknowledge the write.  Since
> quorum is achieved, success is returned to the client and a hint for B
> is written to A (since A is already a replica and since 0.6 hints go
> to existing replicas rather than non-replica nodes).  When B comes
> back up, it requests hints, A sends the missed write, bringing B back
> in sync.
>
>
> b
>
> On Thu, Jul 8, 2010 at 7:04 AM, ChingShen <chingshenchen@gmail.com> wrote:
> > If so, when does hinted handoff work?
> >
> > On Thu, Jul 8, 2010 at 9:55 PM, Anty <anty.rao@gmail.com> wrote:
> >>
> >>
> >> On Thu, Jul 8, 2010 at 4:11 PM, ChingShen <chingshenchen@gmail.com>
> wrote:
> >>>
> >>> Hi all,
> >>>
> >>>   Please consider this case: (RF=1, CL=ONE)
> >>>
> >>>   1. I have A, B and C nodes.
> >>>   2. A node is a coordinator node, it sends a request to B node to do
> >>> write operation.
> >>>   3. B node is down during write operation, so return failure message
> to
> >>> client, and write a hint to C node.
> >>
> >> I think node A will return failure message to client.
> >> and will not write a hint to C node.
> >>
> >>>
> >>>   4. B node comes back up, then C node forwards the data to it.
> >>>   5. B node own data right now, although the write operation is
> failure.
> >>>
> >>>   Correctly?
> >>>
> >>> Thanks.
> >>>
> >>> Shen
> >>
> >>
> >>
> >> --
> >> Best Regards
> >> Anty Rao
> >
> >
> >
>

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