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https://issues.apache.org/jira/browse/IGNITE-8031?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Roman Kondakov reassigned IGNITE-8031:
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Assignee: Roman Kondakov (was: Sergey Kalashnikov)
> MVCC TX: TxLog does not support partitions rebalance at the moment. We need
> to implement it.
> --------------------------------------------------------------------------------------------
>
> Key: IGNITE-8031
> URL: https://issues.apache.org/jira/browse/IGNITE-8031
> Project: Ignite
> Issue Type: Bug
> Components: sql
> Reporter: Roman Kondakov
> Assignee: Roman Kondakov
> Priority: Major
> Labels: mvcc, sql
>
> When new node joins to the cluster after the partitions rebalance it has
> empty TxLog. And therefore all transactions committed before this join are
> considered as uncommitted by this node.
> Solution:
> # introduce a special hint bits (most significant bits in operation
> counter) which will be actualized whenever it is possible.
> # such bits should be updated via CAS operation and the page, which
> contains the data, should be marked as dirty even under read lock
> # rebalance iterator returns only COMMITTED versions of row (the row must
> have committed start version) with actualized hint bits for both create and
> update versions.
> # during force keys requests both COMMITTED rows and pending changes (rows
> having ACTIVE start version) should be sent with actualized hint bits for
> both create and update versions (if applicable).
> # all readers check hint bits before checking with TxLog.
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