incubator-cassandra-user mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From Jake Luciani <jak...@gmail.com>
Subject Re: Taking down a node in a 3-node cluster, RF=2
Date Sun, 28 Nov 2010 17:11:53 GMT
If you read/write data with quorum then you can safely take a node down in
this scenario.  Subsequent writes will use hinted handoff to be passed to
the node when it comes back up.

More info is here: http://wiki.apache.org/cassandra/HintedHandoff

Does that answer your question?

-Jake


On Sun, Nov 28, 2010 at 9:42 AM, Ran Tavory <rantav@gmail.com> wrote:

> to me it makes sense that if hinted handoff is off then cassandra cannot
> satisfy 2 out of every 3rd writes writes when one of the nodes is down since
> this node is the designated node of 2/3 writes.
> But I don't remember reading this somewhere. Does hinted handoff affect
> David's situation?
> (David, did you disable HH in your storage-config?
> <HintedHandoffEnabled>false</HintedHandoffEnabled>)
>
>
> On Sun, Nov 28, 2010 at 4:32 PM, David Boxenhorn <david@lookin2.com>wrote:
>
>> For the vast majority of my data usage eventual consistency is fine (i.e.
>> CL=ONE) but I have a small amount of critical data for which I read and
>> write using CL=QUORUM.
>>
>> If I have a cluster with 3 nodes and RF=2, and CL=QUORUM does that mean
>> that a value can be read from or written to any 2 nodes, or does it have to
>> be the particular 2 nodes that store the data? If it is the particular 2
>> nodes that store the data, that means that I can't even take down one node,
>> since it will be the mandatory 2nd node for 1/3 of my data...
>>
>
>
>
> --
> /Ran
>
>

Mime
View raw message