Re: Question about sharding of rows and atomicity

2011-10-05 Thread Konstantin Naryshkin
Cassandra does not break apart a row. All of the columns of a row are kept on the same nodes. I believe that writing multiple columns of the same row is transactional, but not atomic. By which I mean that if one column is written all the other ones will be written as well, but if a read happens

Re: Question about sharding of rows and atomicity

2011-10-05 Thread Jonathan Ellis
On Wed, Oct 5, 2011 at 1:09 PM, Don Smith wrote: > Does Cassandra shard the columns of a single row across multiple nodes so > that to read the columns of the row it may need access to multiple nodes? > I'd say "no." Correct. >   Will a read from a given node ever return partial results or > is