[jira] [Assigned] (IGNITE-8031) MVCC TX: TxLog does not support partitions rebalance at the moment. We need to implement it.

["Roman Kondakov (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/IGNITE-8031?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Roman Kondakov reassigned IGNITE-8031:
--------------------------------------

    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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