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https://issues.apache.org/jira/browse/IGNITE-22904?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Roman Puchkovskiy reassigned IGNITE-22904:
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Assignee: Roman Puchkovskiy
> Disallow old MG majority to hijack leadership
> ---------------------------------------------
>
> Key: IGNITE-22904
> URL: https://issues.apache.org/jira/browse/IGNITE-22904
> Project: Ignite
> Issue Type: Improvement
> Reporter: Roman Puchkovskiy
> Assignee: Roman Puchkovskiy
> Priority: Major
> Labels: iep-128, ignite-3
>
> If, during a join (on getting the fresh cluster state from the CMG), a node
> detects that, according to the MG configuration saved in the MG on this node,
> this node is the member of the voting set (i.e. it’s a peer, not a learner),
> and this node is NOT one of the metastorageNodes in the CMG, then, before
> starting its MG Raft member, it raises a flag that disallows its Raft node
> becoming a candidate.
> (This flag does not exist in JRaft, we need to introduce it there; the flag
> is not persisted).
> As soon as the Raft node applies a new Raft configuration (coming from the
> new leader), this flag is cleared.
> After this, the Raft node is ‘converted’ to the new MG and cannot hijack the
> leadership.
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