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https://issues.apache.org/jira/browse/IGNITE-16011?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Kirill Gusakov reassigned IGNITE-16011:
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Assignee: Kirill Gusakov
> Start new rebalance round, when partition assignments updated
> -------------------------------------------------------------
>
> Key: IGNITE-16011
> URL: https://issues.apache.org/jira/browse/IGNITE-16011
> Project: Ignite
> Issue Type: Task
> Reporter: Kirill Gusakov
> Assignee: Kirill Gusakov
> Priority: Major
> Labels: ignite-3
>
> When partition assignments are updated, we need to start raft changePeers and
> handle failover scenarios.
> When metastore event about partition assignments updates received we need to:
> - Start all needed nodes
> {code:java}
> partition.assignments.pending / partition.assignments.stable{code}
> - After successful starts - check if current node is the leader of raft
> group (leader response must be updated by current term) and
> changePeers(leaderTerm, peers). changePeers from old terms must be skipped.
> Also, we need the propagation of some new events from the raft side:
> * {{onLeaderElected(boolean configurationChangeInProgress)}} - must be
> executed from the new leader when raft group changes the leader. Maybe we
> actually need to also check if a new lease is received - we need to
> investigate.
> * {{onChangePeersError(errorContext)}} - must be executed when any errors
> during changePeers occurred
> * {{onChangePeersCommitted(peers)}} - must be executed with the list of new
> peers when changePeers has successfully done.
> and handle them by appropriate way:
> * {{{}onLeaderElected({}}}{{{}configurationChangeInProgress{}}}{{{}){}}} -
> we need to:
> ** if {{configurationChangeInProgress}} == false and pending/planned
> assignments not empty - run new changePeers. If true, do nothing.}}
> * {{onChangePeersError(errorContext)}} - run failover logic
> * {{onChangePeersCommitted(peers)}} - check if planned assignments is not
> empty and move it to pending.
> *
> -- Update pending and stable partitions assignments:
> {code:java}
> metastoreInvoke: \\ atomic
> // Here we can check invariant that pending is empty, but planned is not
> is impossible
> partition.assignments.stable = appliedPeers
> if empty(partition.assignments.planned):
> partition.assignments.pending = empty
> else:
> partition.assignments.pending = partition.assignments.planned {code}
> When {{partition.assignments.stable}} updated, we need to:
> * Replace current raft client with new one, with appropriate peers
> * Stop unneeded raft node
>
> (Phase 1)
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