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Change maps codfw replication factor for v4 keyspace
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replication factor for maps eqiad is configured as 3 as compared to maps codfw which is 4. We should change codfw's `replication factor to 3 as well to reduce disk space usage and prevent future occurence of T224395.

Event Timeline

Mentioned in SAL (#wikimedia-operations) [2019-06-25T13:54:38Z] <onimisionipe> changing replication factor of v4 keyspace for maps codfw cluster - T226161