> Thanks James. Yeah, we're using the datastax java driver. But we're on 
> version 2.1.10.2. And we are not using the client side timestamps.


Just to check Ninad. If you are using Cassandra-2.1 (native protocol
v3) and the java driver version 3.0 or above, then you would be using
client-side timestamps by default.
https://github.com/datastax/java-driver/tree/3.x/manual/query_timestamps

With client-side timestamps all client servers and all C* nodes must
be kept tightly in-sync, as Elliot said. Monitoring and alerting on
any clock skew on any of these machines is important.

Also worth checking that any local_quorum requests are not
accidentally go to the wrong datacenter.

regards,
Mick

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