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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