Blake Eggleston created CASSANDRA-21104:
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Summary: CEP-58: Satellite Datacenters
Key: CASSANDRA-21104
URL: https://issues.apache.org/jira/browse/CASSANDRA-21104
Project: Apache Cassandra
Issue Type: Epic
Components: Consistency/Coordination
Reporter: Blake Eggleston
Assignee: Blake Eggleston
CEP-58 proposes adding satellite data centers as an alternative to the 3 full
DC topology for achieving multi-DC high availability. Satellites are small
witness only datacenters (~1/15th full DC size) that replicate the mutation
journal, but otherwise don’t run the storage engine. This enables
transactionally consistent HA (via failover) with just 2 full DCs and one
satellite DC.
This feature benefits users running clusters in a 1 or 2 DC topology for cost
or latency reasons, and is especially beneficial for paxos heavy workloads,
since only one of the paxos messages needs a satellite round trip. When used in
conjunction with witness replicas in the full DCs, single DC clusters could
become HA for less than the cost of adding a second datacenter.
The adopted CEP is linked here:
https://cwiki.apache.org/confluence/display/CASSANDRA/CEP-58:+Satellite+Datacenters
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