Hello, I would like one of the cluster's nodes to use get_range_slices() to retrieve the values of a specific column for the entire keyspace. I obviously don't want to do it for the whole keyspace at once, so I'd like to do it in groups of n, which should be configurable.
I get the first n values using a KeyRange with the current node's local token as start_token and end_token, which equals the whole keyspace. After that, it makes sense to have a loop, and to use each time a new KeyRange with the largest key returned by the previous iteration as the start_key. However, I don't know what to use as end_key, and Cassandra complains that if one of (start_key, end_key) is not null, the other can't be either. What can I do? Can I use tokens? I read that a KeyRange with tokens is end-inclusive, and can wrap, so I can just give the local node's token as the end_token all the time, so when the traversing reaches that node again, it will know the whole keyspace was traversed. Or are tokens different semantically? I am using Cassandra 0.7.0 beta1, and the OrderPreservingPartitioner. Alexander Altanis
