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From Benjamin Black...@b3k.us>
Subject Re: Some questions about the write operation and hinted handoff
Date Thu, 08 Jul 2010 18:47:22 GMT
Important safety tip, I did not know that.

On Thu, Jul 8, 2010 at 11:31 AM, Jonathan Ellis <jbellis@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 <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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