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Status Submitted
Categories Atlas
Created by Guest
Created on Oct 2, 2020

RELATED FEEDBACK

Implement create-before-destroy when migrating NVME instances

When triggering a cross-region migration Atlas immediately degrades a cluster by going to N-1 nodes prior to creating a replacement node in the new region. When using NVME instances, this violates the agreed upon replication depth. Once the NVME instance in the source region is destroyed, there are only N-1 copies of the data left, as there is no EBS backing. NVME target instances should be brought up as {hidden=true, priority=0} until leaving STARTUP2 and entering SECONDARY. Once this occurs, the target instance should be brought to {hidden=false, priority=P}, and a source instance hidden, removed after a quiescence period, and destroyed.
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