Does anyone have any advice for me about how to do live updates (i.e. updates on clusters while they are in use)?
My situation is like this: Some data comes from the "back office" - this data is imported to Cassandra from Oracle. Some data comes from users - this data is imported to Oracle from Cassandra. For nomalized data, I don't see a problem updating Cassandra from Oracle. But updating my indexes on a live database is tricky, because an update of a single normalized item results in a complex set of updates to indexes, in which there are a lot of data inter-dependencies (i.e. the Cassandra equivalent of complex SQL queries). Deletes are especially tricky. How about using two Cassandra keyspaces, one live, and one off-line, updating the off-line keyspace, and then making it live? This would allow me to start fresh with each update - easier than an incremental update. What tools to I have to help me with this? Any other thoughts? All suggestions are welcome!
