himanshug commented on issue #9463: Add namespaces to Druid segments within a data source URL: https://github.com/apache/druid/issues/9463#issuecomment-598417933 @JulianJaffePinterest thanks for explaining the difficulties. However considering the use case at hand and the alternatives available, order wise, I would first explore fixing union queries which has more benefits. However if a technical limitation is hit that didn't allow problems to be resolved then namespace as a secondary option would be the necessary choice. @glasser if you tried one dataSource for all customers and found it to be too problematic due to scale etc and really needed per customer-tier QoS, then per customer-tier dataSource would probably be the right fix in that situation.
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