ok sorry I thought columns inside a row had their keys hashed also
So they are just putted as raw bytes
thx
2012/6/1 aaron morton
> If you hash 4 composite keys, let's say
> ('A','B','C'), ('A','D','C'), ('A','E','X'), ('A','R','X'), you have only 4
> hashes or you have more?
>
> Four
>
> If it
> If you hash 4 composite keys, let's say ('A','B','C'), ('A','D','C'),
> ('A','E','X'), ('A','R','X'), you have only 4 hashes or you have more?
Four
> If it's 4, how come you are able to range query for example between
> start_column=('A', 'D') and end_column=('A','E') and get this column
> ('
but sorry, I don"t undertand
If you hash 4 composite keys, let's say
('A','B','C'), ('A','D','C'), ('A','E','X'), ('A','R','X'), you have only 4
hashes or you have more?
If it's 4, how come you are able to range query for example between
start_column=('A', 'D') and end_column=('A','E') and get th
it is hashed once.
To the partitioner it's just some bytes. Other parts of the code car about it's
structure.
Cheers
-
Aaron Morton
Freelance Developer
@aaronmorton
http://www.thelastpickle.com
On 31/05/2012, at 7:00 PM, Cyril Auburtin wrote:
> Thx for the answer
> 1 more th
Thx for the answer
1 more thing, a Composite key is not hashed only once I guess?
It's hashed the number of part the composite have?
So this means there are twice or 3 or ... as many keys as for normal column
keys, is it true?
Le 31 mai 2012 02:59, "aaron morton" a écrit :
> Composite Columns com
Composite Columns compare each part in turn, so the values are ordered as
you've shown them.
However the rows are not ordered according to key value. They are ordered using
the random token generated by the partitioner see
http://wiki.apache.org/cassandra/FAQ#range_rp
> What is the real advan
How is it done in Cassandra to be able to range query on a composite key?
"key1" => (A:A:C), (A:B:C), (A:C:C), (A:D:C), (B,A,C)
like get_range ("key1", start_column=(A,"), end_column=(A, C)); will return
[ (A:B:C), (A:C:C) ] (in pycassa)
I mean does the composite implementation add much overhead
