What do you mean by “automatically starts syncing?” Are you seeing streaming of existing data or just the addition of new, incoming data? Do you have repairs running as part of your automated maintenance, perhaps?
I would expect that new, incoming data would be replicated to the new DC after the “alter table.” But I would not expect any streaming of existing data unless repairs are running somewhere. Also, does your nodetool status reflect the new DC? Sean Durity From: Vijay Patil [mailto:vijay2110.t...@gmail.com] Sent: Tuesday, April 05, 2016 2:27 AM To: user@cassandra.apache.org Subject: cross DC data sync starts without rebuilding nodes on new DC Hi, I have configured new DC as per instructions at below link. https://docs.datastax.com/en/cassandra/2.0/cassandra/operations/ops_add_dc_to_cluster_t.html After completing step 7.a (which is altering keyspace with desired replication factor for new DC) data automatically starts syncing from existing DC to new DC, which is not expected because auto_bootstrap is false on all nodes (existing as well as new DC). Any idea why it's happening? If this is the desired behaviour then what's the purpose of rebuilding each node on new DC (step 7.b)? Cassandra version is 2.0.17 on all nodes in both DC's and I am using GossipingPropertyFileSnitch. Regards, Vijay ________________________________ The information in this Internet Email is confidential and may be legally privileged. It is intended solely for the addressee. Access to this Email by anyone else is unauthorized. If you are not the intended recipient, any disclosure, copying, distribution or any action taken or omitted to be taken in reliance on it, is prohibited and may be unlawful. When addressed to our clients any opinions or advice contained in this Email are subject to the terms and conditions expressed in any applicable governing The Home Depot terms of business or client engagement letter. The Home Depot disclaims all responsibility and liability for the accuracy and content of this attachment and for any damages or losses arising from any inaccuracies, errors, viruses, e.g., worms, trojan horses, etc., or other items of a destructive nature, which may be contained in this attachment and shall not be liable for direct, indirect, consequential or special damages in connection with this e-mail message or its attachment.
