Timothee Maret created SLING-5423:
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Summary: embedded raft based discovery mechanism
Key: SLING-5423
URL: https://issues.apache.org/jira/browse/SLING-5423
Project: Sling
Issue Type: New Feature
Components: Extensions
Affects Versions: Discovery Standalone 1.0.2
Reporter: Timothee Maret
The Raft consensus algorithm [0] is a good pick for implenting the discovery
API or more generally clustering solutions.
Indeed, Raft algorithm design aims at being "easy" to understand and thus
"easy" to be implemented/debugged maybe by mere mortals.
One of the major implementation of Raft is etcd [1] which Sling can already
leverage (SLING-4842).
However, etcd requires an extra piece of infrastructure to be deployed (the
etcd servers) which can't be shipped as part of the Sling quickstart (Go vs
Java techs).
Using an embedded Raft based discovery and clustering mechanism would bring an
easy to deploy solution (OOTB) and based on proven algorithm.
As Raft is designed to be easy to implement, many implementations already
exists [0].
Ideally an existing implementation could be reused instead of reimplementing it
though.
An interesting one is Copycat [2] which is now released and Apache 2 licensed.
[0] https://raft.github.io
[1] https://github.com/coreos/etcd
[2] https://github.com/atomix/copycat
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