[jira] [Created] (SLING-5435) Decouple processes that depend on cluster leader elections from the cluster leader elections.

["Ian Boston (JIRA)" <ji...@apache.org>]

Ian Boston created SLING-5435:
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             Summary: Decouple processes that depend on cluster leader elections from the cluster leader elections.
                 Key: SLING-5435
                 URL: https://issues.apache.org/jira/browse/SLING-5435
             Project: Sling
          Issue Type: Improvement
          Components: General
            Reporter: Ian Boston


Currently there are many processes in Sling that must complete before a Sling Discovery cluster leader election is declared complete. These processes include things like transferring all Jobs from the old leader to the new leader and waiting for the data to appear visible on the new leader. This introduces an additional overhead to the leader election process which introduces a higher than desirable timeout for elections and heartbeat. This higher than desirable timeout precludes the use of more efficient election and distributed consensus algorithms as implemented in Etcd, Zookeeper or implementations of RAFT.

If the election could be declared complete leaving individual components to manage their own post election operations (ie decoupling those processes from the election), then faster election or alternative Discovery implementations such as the one implemented on etcd could be used.



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