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From "Vladimir Ozerov (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (IGNITE-8371) MVCC TX: Force key request during rebalance may cause error on backups.
Date Thu, 16 Aug 2018 15:23:01 GMT

     [ https://issues.apache.org/jira/browse/IGNITE-8371?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Vladimir Ozerov updated IGNITE-8371:
------------------------------------
    Component/s: mvcc

> MVCC TX: Force key request during rebalance may cause error on backups.
> -----------------------------------------------------------------------
>
>                 Key: IGNITE-8371
>                 URL: https://issues.apache.org/jira/browse/IGNITE-8371
>             Project: Ignite
>          Issue Type: Bug
>          Components: mvcc, sql
>            Reporter: Roman Kondakov
>            Assignee: Roman Kondakov
>            Priority: Major
>
> When backup is updating during rebalance and the key to be updated in TX is not supplied
yet from the previous partition owner, backup makes force key request in order to obtain this
key and all its versions. But later this key can be send to this backup from the previous
owner once again as a part of standard rebalance process. And this causes write conflict:
we have to write this key on the backup once again.
> Solution: do not update key when it has already been written before (during rebalance
or force key request process).



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