I am not sure if this is actually an XDR question per se as it has to do with the receiving data center. I know that XDR is only configured on the sending side and was not certain if the site being updated makes a distinction between updates from XDR and others.
When I enable XDR, on the receiving site I am seeing an increase in read latency leading to a spike in the occurrence of timeouts. I can mitigate the problem by throttling XDR but I have to throttle down very far to the point where the lag becomes a serious issue. The “high” time out rate is still on the order of 0.5%, so this is a problem affecting only the extremes, but I was wondering if there was a strategy to make sure that writes do not block reads in a situation where returning slightly stale data is preferable to timing out.