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https://issues.apache.org/jira/browse/IGNITE-5935?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16649011#comment-16649011
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Ivan Pavlukhin commented on IGNITE-5935:
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Possible (not major) problems:
1. Premature ack transaction complete on coordinator in case of _nearTxCheck_.
2. Possibility to get inconsistent results when transaction is _salvaged_ after
double failure (first near then primary).
> MVCC TX: Tx recovery protocol
> -----------------------------
>
> Key: IGNITE-5935
> URL: https://issues.apache.org/jira/browse/IGNITE-5935
> Project: Ignite
> Issue Type: Task
> Components: cache, mvcc
> Reporter: Semen Boikov
> Assignee: Ivan Pavlukhin
> Priority: Major
> Fix For: 2.7
>
>
> Transaction recovery procedure is initiated when near node failed before
> transaction was finished.
> In MVCC transactions _partition update counter_ modification is started on
> prepare phase. If a transaction was prepared at least on one node we need to
> finish _partition update counter_ modification consistently on all
> participating nodes.
> Also recovered transaction should be removed from active transactions list on
> mvcc coordinator.
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