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From ChingShen <chingshenc...@gmail.com>
Subject Re: Some questions about the write operation and hinted handoff
Date Thu, 08 Jul 2010 15:23:49 GMT
Thanks Jonathan Ellis,

  I want to make sure that after A return failure message to client at
CL.ONE, *does A write a hint to C?* If so, although the write operation is
failed, but the data is still stored in C? if B comes back up, then C
forwards to B?

Shen

On Thu, Jul 8, 2010 at 10:08 PM, Jonathan Ellis <jbellis@gmail.com> wrote:

> On Thu, Jul 8, 2010 at 12:45 AM, ChingShen <chingshenchen@gmail.com>
> wrote:
> > hmm... I'm really confused.
> > The http://wiki.apache.org/cassandra/API document mentioned that if
> write
> > ConsistencyLevel=ANY that "Ensure the write has been written to at least
> 1
> > node, including hinted recipients.", I couldn't imagine this case. :(
> >
> > If I have A,B,C and D nodes(RF=1), and write ConsistencyLevel=ANY, so A
> > coordinator node sends a write request to another node(e.g. B node), but
> B
> > node is down during write operation, what happend? return failure message
> to
> > client immediately? or write a hint to another node(e.g. C node)
>
> It will write a hint and report success.
>
> But if you were writing at CL.ONE it would fail the write because a
> hinted write isn't readable until it can be forwarded to the "right"
> node (here, B).
>
> --
> Jonathan Ellis
> Project Chair, Apache Cassandra
> co-founder of Riptano, the source for professional Cassandra support
> http://riptano.com
>

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