so, that was actually simpler than i thought ay? cheers guys~ On 26 May 2011 05:38, Roland Gude <roland.g...@yoochoose.com> wrote:
> That is correct. Random partitioner orders rows according to the MD5 sum. > > Am 25.05.2011 um 16:11 schrieb "Robert Jackson" <robe...@promedicalinc.com > >: > > Also, it is my understanding that if you are not using > OrderPreservingPartitioner a get_range_slices may not return what you would > expect. > > With the RandomPartitioner you can iterate over the complete list by using > the last row key as the start for subsequent requests, but if you are using > a single query you will be returned all the rows where the returned row > key's md5 is between the md5 of the start row key and stop row key. > > Reference: > http://wiki.apache.org/cassandra/FAQ - "Why aren't range slices/sequential > scans giving me the expected results?" > > Robert Jackson > > ------------------------------ > *From: *"Jonathan Ellis" <jbel...@gmail.com> > *To: *user@cassandra.apache.org > *Sent: *Wednesday, May 25, 2011 8:54:34 AM > *Subject: *Re: "range query" vs "slice range query" > > get_range_slices is the api to get a slice (of columns) from each of a > range (of rows) > > On Wed, May 25, 2011 at 3:42 AM, david lee <iecan...@gmail.com> wrote: > > hi guys, > > i'm reading up on the book "Cassandra - Definitive guide" > > and i don't seem to understand what it says about "ranges and slices" > > my understanding is > > a range as in "a mathematical range to define a subset from an ordered > set > > of elements", > > in cassandra typically means a range of rows whereas > > a slice means a range of columns. > > a range query refers to a query to retrieve a range of rows whereas > > a slice range queyr refers to a query to retrieve range of columns within > a > > row. > > i may be talking about total nonsense but i really am more confused after > > reading this portion of the book > > > http://books.google.com/books?id=MKGSbCbEdg0C&pg=PA134&lpg=PA134&dq=cassandra+%22range+query%22+%22range+slice%22&source=bl&ots=XoPB4uA60u&sig=uDDoQe0FRkQobHnr-vPvvQ3B8TQ&hl=en&ei=ub3cTcvGLZLevQOuxs3CDw&sa=X&oi=book_result&ct=result&resnum=4&ved=0CCwQ6AEwAw#v=onepage&q=cassandra%20%22range%20query%22%20%22range%20slice%22&f=false > > many thanx in advance > > david > > > > > > -- > Jonathan Ellis > Project Chair, Apache Cassandra > co-founder of DataStax, the source for professional Cassandra support > http://www.datastax.com > >
