Right, if the nodes are marked up but do not confirm the writes, it will result in a TimedOutException. (It still won't generate hinted writes).
To summarize: hinted writes are only generated when Cassandra (a) knows a target is down ahead of time and (b) still has enough UP targets to satisfy the requested CL. On Thu, Jul 8, 2010 at 1:48 PM, Benjamin Black <b...@b3k.us> wrote: > To clarify, this requires the coordinator know nodes are down. If the > nodes are marked UP, but do not confirm the writes, this behavior does > not seem possible. > > On Thu, Jul 8, 2010 at 11:31 AM, Jonathan Ellis <jbel...@gmail.com> wrote: >> On Thu, Jul 8, 2010 at 1:19 PM, Benjamin Black <b...@b3k.us> wrote: >>> On Thu, Jul 8, 2010 at 9:02 AM, ChingShen <chingshenc...@gmail.com> wrote: >>>> Hmm.. as you mentioned that it will write a hint and report success at >>>> CL.ANY, does the hinted handoff only work at CL.ANY? >>>> >>> >>> Still no. Hints are written when nodes are down, regardless of CL, >>> unless HH is disabled. CL does not influence whether hints are >>> written, it influences whether success is reported to the client. For >>> CL.ANY a hint is a success, for CL.ONE it is a failure. >> >> If the coordinator knows it can't achieve the requested CL it won't do >> any writes, hinted or otherwise, and will immediately report >> UnavailableException to the client. >> >> -- >> Jonathan Ellis >> Project Chair, Apache Cassandra >> co-founder of Riptano, the source for professional Cassandra support >> http://riptano.com >> > -- Jonathan Ellis Project Chair, Apache Cassandra co-founder of Riptano, the source for professional Cassandra support http://riptano.com
