You've set a comparator for the super column names, but not the sub columns. 
e.g. 

[default@dev] set data['31']['address']['city']='noida';    
org.apache.cassandra.db.marshal.MarshalException: cannot parse 'city' as hex 
bytes
[default@dev] set data['31']['address'][utf8('city')]='noida';
Value inserted.

Hope that helps. 

-----------------
Aaron Morton
Freelance Cassandra Developer
@aaronmorton
http://www.thelastpickle.com

On 21 Jun 2011, at 19:06, Vivek Mishra wrote:

> I understand that I might be missing something on my end. But somehow I 
> cannot get this working using Cassandra-cli:
>  
> [default@key1] create column family supusers with comparator=UTF8Type and 
> default_validation_class=UTF8Type and key_validation_class=UTF8Type and 
> column_type=Super;
>  
> 59e2e950-9bd4-11e0-0000-242d50cf1fbf
> Waiting for schema agreement...
> ... schemas agree across the cluster
>  
> SuperColumn family got created.
>  
> Issued 
> [default@key1] assume supusers keys as ascii;
>  
> But still it is failing for:
>  
> [default@key1] set supusers['31']['address']['city']='noida';
>  
> org.apache.cassandra.db.marshal.MarshalException: cannot parse 'city' as hex 
> bytes
>  
>  
> Please suggest, what am I doing incorrect here?
>  
>  
> 
> 
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