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From Ajay Garg <>
Subject Is replication possible with already existing data?
Date Wed, 07 Oct 2015 15:56:02 GMT
Hi All.

We have a scenario, where till now we had been using a plain, simple
single node, with the keyspace created using ::

CREATE KEYSPACE our_db WITH replication = {'class': 'SimpleStrategy',
'replication_factor': '1'}  AND durable_writes = true;

We now plan to introduce replication (in the true sense) in our scheme
of things, but cannot afford to lose any data.
We, however can take a bit of downtime, and do any data-migration if
required (we have already done data-migration once in the past, when
we moved our plain, simple single node from one physical machine to


Is it possible at all to introduce replication in our scenario?
If yes, what needs to be done to NOT LOSE our current existing data?

Also, will "NetworkTopologyStrategy" work in our scenario (since
NetworkTopologyStrategy seems to be more robust)?

Brief pointers to above will give huge confidence-boosts in our endeavours.

Thanks and Regards,

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