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 <jbel...@gmail.com> wrote: > On Thu, Jul 8, 2010 at 12:45 AM, ChingShen <chingshenc...@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 >
