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From "Andrew Mashenkov (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (IGNITE-10219) MVCC: TX: Backup node update may fails after lost tx rollback.
Date Mon, 12 Nov 2018 12:20:03 GMT

     [ https://issues.apache.org/jira/browse/IGNITE-10219?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

Andrew Mashenkov updated IGNITE-10219:
    Attachment:     (was: CacheMvccTxFailoverTest.java)

> MVCC: TX: Backup node update may fails after lost tx rollback.
> --------------------------------------------------------------
>                 Key: IGNITE-10219
>                 URL: https://issues.apache.org/jira/browse/IGNITE-10219
>             Project: Ignite
>          Issue Type: Bug
>          Components: mvcc
>            Reporter: Andrew Mashenkov
>            Priority: Major
>         Attachments: CacheMvccTxFailoverTest.java
> The use case:
>  # Start Tx and update entry.
>  # Kill backup.
>  # Rollback Tx (backup miss this tx state change due to outage)
>  # Start backup.
>  # Update same entry may fails with unknown tx state for latest entry version.
> Backup won't rebalance partition for the key as rollback doesn't increment partition
counter and can't found active transaction for latest entry version as TxLog contains neither
commit nor rollback record.
> Also Tx can't be detected as rolled back as mvcc coordinator version hasn't changed during
backup node outage.
> Possible solutions are
>  # Increment mvcc coordinator version on every node join event that need to be carefully
>  # Scan cache to cleanup such entries on node startup (right after recovery from WAL)
which is inefficient.
>  # Or may be log Tx start in TxLog and rollback all active Tx on node startup.

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