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Cassandra | Cross Data Centre Replication Status

Hi Experts,

I previously had 1 Cassandra data centre in AWS Singapore region with 5 nodes, with my keyspace's replication factor as 3 in Network topology.

After this cluster has been running smoothly for 4 months (500 GB of data on each node's disk), I added 2nd data centre in AWS Mumbai region with yet again 5 nodes in Network topology.

After updating my keyspace's replication factor to {"AWS_Sgp":3,"AWS_Mum":3}, my expectation was that the data present in Sgp region will immediately start replicating on the Mum region's nodes. However even after 2 weeks I do not see historical data to be replicated, but new data being written on Sgp region is present in Mum region as well.

Any help or suggestions to debug this issue will be highly appreciated.

Akshay Bhardwaj