Re: Cassandra and Tableau

2012-07-15 Thread Roshni Rajagopal
Hi Robin, Im from an analytics background, was working in the traditional BI tools like OBIEE and Business Objects, so I am very interested in your evaluations of a good analytics toolset combination. Do share your learnings, At a high level as I understand, cassandra can be used as the backend

Re: SSTable format

2012-07-15 Thread prasenjit mukherjee
Appreciate the insightful replies. Understood Sylvain's argument that having different partitioning locally and globally could create problem in data movement. Edward, for a given sstable in a node, why having lexicographically closer rows clumped together should matter ? Anyways the lookups for

Re: Increased replication factor not evident in CLI

2012-07-15 Thread Michael Theroux
Just to completely eliminate the possibility of the same bug, if you look here: http://www.mail-archive.com/dev@cassandra.apache.org/msg04992.html If you create a test keyspace, and look at the timestamp in the "schema_keyspaces" column family in comparison to your existing keyspace, is that ti

Re: nodetool repair

2012-07-15 Thread Michael Theroux
So, if I have a 6 node cluster in the token ring, A->B->C->D-E->F, replication factor 3, and I run repair (without -pr) on A, is the flow of information: A synchronizes information it is responsible for with B and C (because B and C are replicas of A). A, as a replica of E and F, synchronizes E

Re: nodetool repair

2012-07-15 Thread Edward Capriolo
Great job sleuthing. Originally repair did not have a -pr. When you run the standard repair the node compares it's data with its neighbours and vice versa. They also send each other updates. Since you are supposed to repair every node < gc_grace submitting a full repair to each node would create d