Add preliminary replacement for Cassandra service management #177
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Merging as path forward towards resolving #175, need to iterate further on monitoring and some other edge cases (e.g. zk outage) |
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See #175 - this attempts to solve the problems that the existing Cassandra Cluster Management does, but without requiring a heartbeat that triggers race conditions with other nodes in the same cluster, allowing for a more peaceful "loadbalanced" failover