Hi, If there is a faster/better way to replace a node why not have Cassandra support that natively without the sidecar so people who aren’t running the sidecar can benefit?
Copying files over a network shouldn’t be slow in C* and it would also already have all the connectivity issues solved. Regards, Ariel On Fri, Apr 5, 2024, at 6:46 AM, Venkata Hari Krishna Nukala wrote: > Hi all, > > I have filed CEP-40 [1] for live migrating Cassandra instances using the > Cassandra Sidecar. > > When someone needs to move all or a portion of the Cassandra nodes belonging > to a cluster to different hosts, the traditional approach of Cassandra node > replacement can be time-consuming due to repairs and the bootstrapping of new > nodes. Depending on the volume of the storage service load, replacements > (repair + bootstrap) may take anywhere from a few hours to days. > > Proposing a Sidecar based solution to address these challenges. This solution > proposes transferring data from the old host (source) to the new host > (destination) and then bringing up the Cassandra process at the destination, > to enable fast instance migration. This approach would help to minimise node > downtime, as it is based on a Sidecar solution for data transfer and avoids > repairs and bootstrap. > > Looking forward to the discussions. > > [1] > https://cwiki.apache.org/confluence/display/CASSANDRA/CEP-40%3A+Data+Transfer+Using+Cassandra+Sidecar+for+Live+Migrating+Instances > > Thanks! > Hari
