In most cases, we separate clusters by application. This does help with isolating problems. A bad query in one application won’t affect other applications. Also, you can then scale each cluster as required by the data demands. You can also upgrade separately, which may be a huge help. You only need one team’s testing (and driver change or whatever) before you can upgrade. With a multi-tenant ring, you will need much more coordination for any changes.
There is a practical limit of the number of memtables per cluster, too. This is somewhere in the low hundreds (200-300), based on the amount of RAM you have per node. Sean Durity From: onmstester onmstester <onmstes...@zoho.com> Sent: Monday, July 16, 2018 9:17 AM To: "user" <user@cassandra.apache.org> Subject: [EXTERNAL] New cluster vs Increasing nodes to already existed cluster Currently i have a cluster with 10 nodes dedicated to one keyspace (Hardware sizing been done according to input rate and ttl just for current application requirements). I need a launch a new application with new keyspace with another set of servers (8 nodes), there is no relation between the current and new application. I have two option: 1. add new nodes to already existed cluster (10 nodes + 8 nodes) and share the power and storage between the keyspace 2. create a new cluster for the new application (isolate clusters) Which option do you recommend and why ? (i care about of cost of maintenance, performance (write and read), isolation of problems) Sent using Zoho Mail<https://urldefense.proofpoint.com/v2/url?u=https-3A__www.zoho.com_mail_&d=DwMFaQ&c=MtgQEAMQGqekjTjiAhkudQ&r=aC_gxC6z_4f9GLlbWiKzHm1vucZTtVYWDDvyLkh8IaQ&m=8pMwXGRFpkQIEmUZuLeKtAuzzIVwxEFC4US5d2yFir8&s=StwXEbZ7cy8CGqokpYCbWyWgeSpphuKgyJng60rauGk&e=> ________________________________ 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.
