NealSun96 commented on issue #727: Add MetadataStoreRoutingDataWriter with DistributedLeaderElection URL: https://github.com/apache/helix/pull/727#issuecomment-584290121 A generic comment on all writer logics: some deletion operations can lead to a data state that is deemed "invalid" by `ZkRoutingDataReader`. For example, removing the last realmAddress, or removing the last sharding key for a realmAddress. Questions: 1. Do we allow that to happen? 2. If we don't allow that to happen, should the logic for checking these situations be a part of this PR, or a part of the validation logic PR?
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