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From Jonathan Ellis <jbel...@gmail.com>
Subject Re: Some questions about the write operation and hinted handoff
Date Thu, 08 Jul 2010 18:31:20 GMT
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 <chingshenchen@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

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