Inter node DC delay in Cassandra

Author: Hyder Tom

Originally Sourced from:

Cassandra Inter Node DC delay calculation. How determine the level of delay.

We enabled two DC's: DC1 and DC2. Every thing seems to be running fine. How do we identify the time delay between the DC's. We are using Local_Quorum. How to determine if there is delay in DC2 if DC1 is already committed. We are using local_quorum for both reads and writes.

To what extend we can see changes when the inter_dc_tcp_nodelay is enabled vs disabled. I looking for queries and number to identify in my environment.

Thanks Tom