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From Benjamin Coverston <>
Subject Re: Subcolumn Indexing
Date Tue, 08 Feb 2011 19:21:43 GMT

> Does this just mean the exhaustive list of the column names not all 
> the values?
No, this means the entire supercolumn, names and values. When the client 
tries to access any subcolumn in the supercolumn it has to read the 
entire supercolumn.
> So if I have a super column that has a map of keys that only contain 
> two columns max each this shouldn't really be a performance concern 
> correct? This becomes an issue when you have lots of subcolumns if I'm 
> reading this correctly? I'm looking at using the super column as a 
> good way to cluster data, say I was storing home addresses I might use 
> the zipcode as the super column if I cared mostly about accessing data 
> by logical area for instance. Thanks for the help.
That is one way to logically group the values, but I think that a 
simpler solution may be to store the home address as a single row in a 
column family, then use a dynamic column family to store references to 
those addresses per zip code.

> jt
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