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https://issues.apache.org/jira/browse/IGNITE-28279?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Aleksandr Chesnokov reassigned IGNITE-28279:
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Assignee: Aleksandr Chesnokov
> Snapshot create operation should be allowed during Rolling Upgrade process
> --------------------------------------------------------------------------
>
> Key: IGNITE-28279
> URL: https://issues.apache.org/jira/browse/IGNITE-28279
> Project: Ignite
> Issue Type: Improvement
> Reporter: Sergey Chugunov
> Assignee: Aleksandr Chesnokov
> Priority: Major
> Labels: IEP-132, ise
> Fix For: 2.19
>
>
> Ticket IGNITE-26991 disabled all distributed operations when Rolling Upgrade
> is in progress. It is a safe solution aiming to protect users from tricky
> corner cases but it brings other corner cases with it.
> One could imagine a situation when Rolling Upgrade procedure takes more time
> than initially planned and overlapse with a cron task for creating a
> snapshot. In that case cron task will fail and force the user to create the
> snapshot manually or skip it which is also not good.
> At the same time snapshot creation operation is RU-safe because at the end of
> the day it copies data files that are backward compatible. Even if a snapshot
> was created on an old node, it can be restored on a new one safely (but not
> wise-versa).
> Thus we need to come up with a more flexible mechanism allowing to execute
> some distributed operations on a cluster in the middle of RU process.
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