Raft distributed consensus - Leader election as standalone component

[Ngm]

I am currently implementing RAFT algorithm in GO. I have completed the leader election part (minus the log replication and associated safety constraints).

I was wondering if just the leader election part is useful as a component? The safety check part can be externalized and implemented as interface\plugin that the host code can inject. 

Is such a leader-election only component useful? If yes, then examples would be helpful.

[Oren Eini (Ayende Rahien)]

You need to commit an entry to the log anyway to actually be a leader

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[Ngm]

Yes, was just wondering if leader election without log replication, would be useful anywhere or not at all

[Oren Eini (Ayende Rahien)]

I don't think so, you can't rely on the fact that you are the leader until you committed an entry

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[Ruslan Rusu]

 Hey,

 if you need just leader election then there are simpler protocols like "Eventual Leader Election in the Crash-Recovery Failure Model"

here is more http://www.sc.ehu.es/acwlaalm/sdi/prdc08.pdf

Cheers

[Narasimha Mujumdar]

Hello Rulan,

Thank you, I will look into it

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[Philip Haynes]

HI Ngm - looking out our implementation I am doubtful a standalone leader election component would really be that practical.

However, I thought at start of our implementation and know at the later parts of our implementation a solid set of test cases that 

make explicit the protocol would be a much better contribution. 

[Narasimha Mujumdar]

Hello Philip,

Agree, the test cases for leader election, with various scenarios is useful. The author RAFT- ARC has the following website for comprehensive tests:

https://runway.systems/?model=github.com/ongardie/runway-model-raft

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