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https://issues.apache.org/jira/browse/IGNITE-18172?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Aleksandr Polovtcev updated IGNITE-18172:
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Description:
Currently, the Rebalance protocol only applies to Raft followers. We would like
to extend it to be applicable to rebalancing Raft learners as well. The
following should be done:
# {{partition.assignments.*}} Metastorage keys should store followers'
assignments as well as learners' assignments. I propose adding a flag to the
corresponding entries (i.e. {{isFollower}}).
# When reacting to changes in Metastorage entries, call a new version of
`changePeersAsync` (see IGNITE-18155) that will provide new followers and
learners.
Concrete applications of learners rebalance and actual learner assignments are
subject of further design (e.g. it can be used in Metastorage and Replicated
Tables).
> Raft learners rebalance
> -----------------------
>
> Key: IGNITE-18172
> URL: https://issues.apache.org/jira/browse/IGNITE-18172
> Project: Ignite
> Issue Type: Task
> Reporter: Aleksandr Polovtcev
> Priority: Major
> Labels: ignite-3
>
> Currently, the Rebalance protocol only applies to Raft followers. We would
> like to extend it to be applicable to rebalancing Raft learners as well. The
> following should be done:
> # {{partition.assignments.*}} Metastorage keys should store followers'
> assignments as well as learners' assignments. I propose adding a flag to the
> corresponding entries (i.e. {{isFollower}}).
> # When reacting to changes in Metastorage entries, call a new version of
> `changePeersAsync` (see IGNITE-18155) that will provide new followers and
> learners.
> Concrete applications of learners rebalance and actual learner assignments
> are subject of further design (e.g. it can be used in Metastorage and
> Replicated Tables).
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