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https://issues.apache.org/jira/browse/IGNITE-18061?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Alexander Lapin resolved IGNITE-18061.
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Resolution: Fixed
> Design placement driver
> -----------------------
>
> Key: IGNITE-18061
> URL: https://issues.apache.org/jira/browse/IGNITE-18061
> Project: Ignite
> Issue Type: New Feature
> Reporter: Alexander Lapin
> Assignee: Alexander Lapin
> Priority: Major
> Labels: ignite-3
>
> h3. Motivation
> Well, requirements are a bit hazy. Placement driver should definitely:
> * Provide engine for primary replica selection and failover.
> * Either itself of, indirectly through replicas, generate notifications
> about primary replica change.
> * Answer the question of primary replica placement(mapping to the
> ClusterNode), and corresponding lease interval in assumption that there'll be
> leases.
> * Answer the question of non-primary replicas placment.
> * Answer the question about replication group state. Is majority available?
> Is replication(raft) server up and running for the particular replica? etc.
> h3. Definition of Done
> * Requirements to the placement driver are clear.
> * The contract of the placement driver and its area of responsibility is
> defined.
> * Aforementioned contract meets all known requirements.
> * Design is ready.
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