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https://issues.apache.org/jira/browse/IGNITE-8841?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16759866#comment-16759866
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Igor Seliverstov commented on IGNITE-8841:
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[~Pavlukhin]
1) Probably it makes sense, I left it like this not to change callers. Anyway
we need to do some cleanup of involved classes, I've planned it as a separate
task.
2) This is a special case, there can be active queries which survived several
exchanges and there was no coordinator (no applicable for a coordinator node
filter nodes) before new node have joined. We need to track such queries too.
> MVCC TX: Read transactions remap when coordinator fails.
> --------------------------------------------------------
>
> Key: IGNITE-8841
> URL: https://issues.apache.org/jira/browse/IGNITE-8841
> Project: Ignite
> Issue Type: Bug
> Components: mvcc, sql
> Reporter: Roman Kondakov
> Assignee: Igor Seliverstov
> Priority: Major
> Labels: failover
> Time Spent: 50m
> Remaining Estimate: 0h
>
> At the moment read transactions that don't acquire topology lock will be
> forcibly rolled back on topology change as read tx can be in fly while
> topology being change.
> This is done to prevent having active transaction with stale snapshots on
> new topology in cases of TX coordinator or Near node were lost.
>
> It would be nice to remap it somehow until they locked a topology or at least
> throw some meaningful exception to user.
> For example, it is possible to obtain a new "write" mvcc version from the
> new coordinator and use this version for all further writes while using "old"
> version for reads. In this case we need to change visibility rules a little:
> "old" version should see "own" updates made by "new" "write" version.
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