A question about the Fast Leader Election algorithm

[GIRARD-REYDET Vincent <Vi...@murex.com>]

Hi folks,

I've read the documentation of ZooKeeper (both scholar articles and the book), as well as some of the code. There's still an obscure question to me. How is a new election triggered? Is the reception of a request on the election port sufficient to trigger a new election?

I have constructed a sample case where a member with the most up-to-date index (let's call it A, with zxid=25 and epoch=3) thinks it is following another member (let's call it C), while B & C think they're following A - they both have zxid=12 & epoch=2. I don't understand how A is ever going to learn that it is in fact the leader. Obviously something must be wrong in my understanding. I was trying to build on the case presented in the ZooKeeper book, where A's vote for itself is received late by B...
I have tried to draw the example on the attached picture. Could someone explain me where I'm wrong and point me to the proper part of the code that handles this case?

Thanks,
Vincent
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