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I have 2 DCs, RF is 3 in both of them and consistency is set to quorum. What will happen when a read/write request comes and one of the DC is down ?

Milindkumar Shinalkar
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if you use QUORUM, then you need to have 4 servers with replica's online. So in your case, if one DC is down, operations will fail. If possible, consider use of LOCAL_QUORUM instead.

Alex Ott
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