incubator-cassandra-user mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From aaron morton <>
Date Sun, 11 Nov 2012 21:38:44 GMT
Also most idomatic clients use the information so they can return the appropriate type to you.

>  Can the metadata be applied
> after the fact? If so how?
UPDATE COLUMN FAMILY in the CLI will let you change it. 
Note that we do not update the existing data. This can be a problem if you do something like
change a variable length integer to a fixed length one. 


Aaron Morton
Freelance Developer

On 12/11/2012, at 8:06 AM, Kevin Burton <> wrote:

> Thank you this helps with my understanding. 
> So the goal here is to supply as many name/type pairs as can be reasonably
> be foreseen when the column family is created? Can the metadata be applied
> after the fact? If so how?
> -----Original Message-----
> From: Edward Capriolo [] 
> Sent: Sunday, November 11, 2012 9:37 AM
> To:
> If you supply metadata cassandra can use it for several things.
> 1) It validates data on insertion
> 2) Helps display the information in human readable formats in tools like the
> CLI and sstabletojson
> 3) If you add a built-in secondary index the type information is needed,
> strings sort differently then integer
> 4) columns in rows are sorted by the column name, strings sort differently
> then integers
> On Sat, Nov 10, 2012 at 11:55 PM, Kevin Burton <>
> wrote:
>> I am sure this has been asked before but what is the purpose of 
>> entering key/value or more correctly key name/data type values on the 

View raw message