You can’t migrate and upgrade at the same time perhaps but you could do one and then the other so as to end up on new version. I’m guessing it’s an error in the yaml file or a port not open. Is there any good reason for a production cluster to still be on version 2.1x?
Kenneth Brotman From: Durity, Sean R [mailto:sean_r_dur...@homedepot.com] Sent: Monday, March 12, 2018 11:36 AM To: user@cassandra.apache.org Subject: RE: [EXTERNAL] RE: Adding new DC? You cannot migrate and upgrade at the same time across major versions. Streaming is (usually) not compatible between versions. As to the migration question, I would expect that you may need to put the external-facing ip addresses in several places in the cassandra.yaml file. And, yes, it would require a restart. Why is a non-restart more desirable? Most Cassandra changes require a restart, but you can do a rolling restart and not impact your application. This is fairly normal admin work and can/should be automated. How large is the cluster to migrate (# of nodes and size of data). The preferred method might depend on how much data needs to move. Is any application outage acceptable? Sean Durity lord of the (C*) rings (Staff Systems Engineer – Cassandra) From: Kunal Gangakhedkar [mailto:kgangakhed...@gmail.com] Sent: Sunday, March 11, 2018 10:20 PM To: user@cassandra.apache.org Subject: [EXTERNAL] RE: Adding new DC? Hi Kenneth, Replies inline below. On 12-Mar-2018 3:40 AM, "Kenneth Brotman" <kenbrot...@yahoo.com.invalid> wrote: Hi Kunal, That version of Cassandra is too far before me so I’ll let others answer. I was wonder why you wouldn’t want to end up on 3.0x if you’re going through all the trouble of migrating anyway? Application side constraints - some data types are different between 2.1.x and 3.x (for example, date vs. timestamp). Besides, this is production setup - so, cannot take risk. Are both data centers in the same region on AWS? Can you provide yaml file for us to see? No, they are in different regions - GCE setup is in us-east while AWS setup is in Asia-south (Mumbai) Thanks, Kunal Kenneth Brotman From: Kunal Gangakhedkar [mailto:kgangakhed...@gmail.com] Sent: Sunday, March 11, 2018 2:32 PM To: user@cassandra.apache.org Subject: Adding new DC? Hi all, We currently have a cluster in GCE for one of the customers. They want it to be migrated to AWS. I have setup one node in AWS to join into the cluster by following: https://docs.datastax.com/en/cassandra/2.1/cassandra/operations/ops_add_dc_to_cluster_t.html <https://urldefense.proofpoint.com/v2/url?u=https-3A__docs.datastax.com_en_cassandra_2.1_cassandra_operations_ops-5Fadd-5Fdc-5Fto-5Fcluster-5Ft.html&d=DwMFaQ&c=MtgQEAMQGqekjTjiAhkudQ&r=aC_gxC6z_4f9GLlbWiKzHm1vucZTtVYWDDvyLkh8IaQ&m=4s2PNt4_Ty1RVe_0dQ4sn-jQTjmz-Wmxnf2OS4URoYo&s=pfA6Jkn2UwG7AISlAM3OJ1OzQpghd_nVJj-KnYLCvBk&e=> Will add more nodes once the first one joins successfully. The node in AWS has an elastic IP - which is white-listed for ports 7000-7001, 7199, 9042 in GCE firewall. The snitch is set to GossipingPropertyFileSnitch. The GCE setup has dc=DC1, rack=RAC1 while on AWS, I changed the DC to dc=DC2. When I start cassandra service on the AWS instance, I see the version handshake msgs in the logs trying to connect to the public IPs of the GCE nodes: OutboundTcpConnection.java:496 - Handshaking version with /xx.xx.xx.xx However, nodetool status output on both sides don't show the other side at all. That is, the GCE setup doesn't show the new DC (dc=DC2) and the AWS setup doesn't show old DC (dc=DC1). In cassandra.yaml file, I'm only using listen_interface and rpc_interface settings - no explicit IP addresses used - so, ends up using the internal private IP ranges. Do I need to explicitly add the broadcast_address? for both side? Would that require restarting of cassandra service on GCE side? Or is it possible to change that setting on-the-fly without a restart? I would prefer a non-restart option. PS: The cassandra version running in GCE is 2.1.18 while the new node setup in AWS is running 2.1.20 - just in case if that's relevant Thanks, Kunal _____ 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.
