[jira] [Assigned] (IGNITE-18172) Raft learners rebalance

["Aleksandr Polovtcev (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/IGNITE-18172?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Aleksandr Polovtcev reassigned IGNITE-18172:
--------------------------------------------

    Assignee: Aleksandr Polovtcev

> Raft learners rebalance
> -----------------------
>
>                 Key: IGNITE-18172
>                 URL: https://issues.apache.org/jira/browse/IGNITE-18172
>             Project: Ignite
>          Issue Type: Task
>            Reporter: Aleksandr Polovtcev
>            Assignee: 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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