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While etcd was born in the cloud era, it does not really play well in a dynamic environment where...
While etcd was born in the cloud era, it does not really play well in a dynamic environment where nodes come and go and where IP addresses are ephemeral. Moreover, etcd is meant – with its RAFT algorithm at the core – as a consistent key-value store. It rather refuses to form or join a cluster than putting concistency at risk.
As a consequence it is very conservative in implementing advanced cluster member management mechanisms – or even heuristics to make the operation of an etcd cluster more comfortable for the admin.
The elastic-etcd binary experiments with those advanced member management heuristics. It is meant as a frontend to the etcd binary, applying these heuristics and then creating a matching command line for etcd itself.