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From Colin Blower <cblo...@barracuda.com>
Subject Re: Token Aware Routing: Routing Key Vs Composite Key with vnodes
Date Thu, 11 Jul 2013 21:18:18 GMT
It is my understanding that you must have all parts of the partition key
in order to calculate the token. The partition key is the first part of
the primary key, in your case the userId.

You should be able to get the token from the userId. Give it a try:
cqlsh> select userId, token(userId) from users limit 10;

On 07/11/2013 08:54 AM, Haithem Jarraya wrote:
> Hi All,
>
> I am a bit confused on how the underlying token aware routing is
> working in the case of composite key.
> Let's say I have a column family like this USERS( uuid userId, text
> firstname, text lastname, int age, PRIMARY KEY(userId, firstname,
> lastname))
>
> My question is do we need to have the values of the userId, firstName
> and lastName available in the same time to create the token from the
> composite key, or we can get the right token just by looking at the
> routing key userId?
>
> Looking at the datastax driver code, is a bit confusing, it seems that
> it calculate the token only when all the values of a composite key is
> available, or I am missing something?
>
> Thanks,
>
> Haithem
>


-- 
*Colin Blower*
/Software Engineer/
Barracuda Networks Inc.
+1 408-342-5576 (o)

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