I have this case. We have 6 nodes DSE cluster and the task is to back it up, and restore all the keyspaces, tables and data into a new cluster. But this new cluster has only 4 nodes.
Is it possible to do this?
Is it possible to backup a 6-node DataStax Enterprise cluster and restore it to a new 4-node cluster?
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Yes, it is definitely possible to do this. This operation is more commonly referred to as "cloning" -- you are copying the data from one DataStax Enterprise (DSE) cluster to another.
There is a Cassandra utility called
sstableloaderwhich reads the SSTables and loads it to a cluster even when the destination cluster's topology is not identical to the source.I have previously documented the procedure in How to migrate data in tables to a new Cassandra cluster which is also applicable to DSE clusters. Cheers!