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https://issues.apache.org/jira/browse/IGNITE-28280?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Aleksandr Chesnokov updated IGNITE-28280:
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Summary: Investigate disabling (fully or partially) historical rebalancing
during Rolling Upgrade process (was: Disable (fully or partially) historical
rebalancing during Rolling Upgrade process)
> Investigate disabling (fully or partially) historical rebalancing during
> Rolling Upgrade process
> ------------------------------------------------------------------------------------------------
>
> Key: IGNITE-28280
> URL: https://issues.apache.org/jira/browse/IGNITE-28280
> Project: Ignite
> Issue Type: Improvement
> Reporter: Sergey Chugunov
> Assignee: Aleksandr Chesnokov
> Priority: Major
> Labels: IEP-132, ise
> Fix For: 2.19
>
>
> Historical rebalancing involves sending WAL segments from the nodes with
> up-to-date data to the outdated nodes.
> But WAL segments are only guaranteed to be backwards compatible. Because of
> that a situation is possiblewhen an old node leaves and then returns back to
> the topology and a new node starts sending WAL segments to it. If format of
> WAL segments has changed between versions the old node will fail on reading
> the segments.
> To avoid this we need to make sure that new nodes never use historical
> rebalance to update old nodes. It could be done by a total prohibition of
> historical rebalancing during RU or by falling back to full rebalancing only
> in case of new nodes sending data to old nodes.
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