Hello, We had a similar problem where we needed to migrate data from one cluster to another.
We ended up using Spark to accomplish this. It is fast and reliable but some downtime was required after all. We minimized the downtime by doing a first run, and then run incremental updates. Kind regards, George On Mon, Dec 21, 2015 at 10:12 AM, Noorul Islam K M <noo...@noorul.com> wrote: > > Hello all, > > We have two clusters X and Y with same keyspaces but distinct data sets. > We are planning to merge these into single cluster. What would be ideal > steps to achieve this without downtime for applications? We have time > series data stream continuously writing to Cassandra. > > We have ruled out export/import as that will make us loose data during > the time of copy. > > We also ruled out sstableloader as that is not reliable. It fails often > and there is not way to start from where it failed. > > Any suggestions will help. > > Thanks and Regards > Noorul >
