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Cc: "user@cassandra.apache.org" <user@cassandra.apache.org>
From: Watanabe Maki <watanabe.maki@gmail.com>
Subject: Re: Direct control over where data is stored?
Date: Mon, 6 Jun 2011 15:50:04 +0900
To: "user@cassandra.apache.org" <user@cassandra.apache.org>

You can know endpoints which cassandra will store your key to with getNatura=
lEndpoints, but you can't specify endpoint you want to use with this API.
Partitioner decides which key will go to which node. With OPP, you may be ab=
le to predicate which key range will be stored to a node, so you can choose a=
ny key in the range for your user data A to store it in a specific node.=20
But you can not choose node you want for any specified keys. You need to cho=
ose appropriate key to store data for your target node.

=46rom iPhone


On 2011/06/06, at 13:06, Khanh Nguyen <nguyen.h.khanh@gmail.com> wrote:

> On Sun, Jun 5, 2011 at 11:26 PM, Maki Watanabe <watanabe.maki@gmail.com> w=
rote:
>> getNaturalEndpoints tells you which key will be stored on which nodes,
>> but we can't force cassandra to store given key to specific nodes.
>>=20
>> maki
>=20
> I'm confused. Didn't you mention previously that I can use
> OrderPreservingPartitioner to store data to specific nodes? Thanks.
>=20
> -k