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multiple node bootstrapping


I have 2 dc cassandra 3.0.14 setup. I need to add 2 new nodes to each dc.

I started one node in dc1 and its already joining. 3TB of 50TB finished in 2 weeks. One year ttl time series data with twcs.

I know, its not best practise..

I want to start one node in dc2 and cassandra refused to start with mentioning already one node in joining state.

I find some workaround with jmx directives, but i'm not sure if I broke something on the way.

Is it wise to bootstrap in both dc at the same time?