[DBNode] - Add support for passive replication between M3DB Clusters #1874
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richardartoul
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What this PR does / why we need it:
This feature leverages the existing background repairs feature to add support for configuring M3DB clusters to passively replicate data from each other. It works by refactoring the background repairs feature to support multiple M3DB clients. For background repairs a client for the local cluster is used, for cross-region replication a client for the cluster to replicate from is used, and if both feature are enabled then both clients are used.
Fixes #
Lack of support for replication between M3DB clusters.
Special notes for your reviewer:
N.A
Does this PR introduce a user-facing and/or backwards incompatible change?:
N.A
Does this PR require updating code package or user-facing documentation?:
N.A