[jira] [Commented] (IGNITE-17215) Write ClusterSnapshotRecord to WAL

["Ignite TC Bot (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/IGNITE-17215?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17562486#comment-17562486 ] 

Ignite TC Bot commented on IGNITE-17215:
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> Write ClusterSnapshotRecord to WAL
> ----------------------------------
>
>                 Key: IGNITE-17215
>                 URL: https://issues.apache.org/jira/browse/IGNITE-17215
>             Project: Ignite
>          Issue Type: New Feature
>            Reporter: Maksim Timonin
>            Assignee: Maksim Timonin
>            Priority: Major
>              Labels: IEP-89
>          Time Spent: 10m
>  Remaining Estimate: 0h
>
> For PITR [1] process of recovering based on ClusterSnapshot + archived WALs.
> It's required to have a point in WAL which splits whole WAL on 2 areas:
>  # Before this point all data changes are contained within ClusterSnapshot, and no need to recover them from WAL archived files.
>  # After this point all data need to be recovered from WAL archived files.
> It's proposed to write ClusterSnapshotRecord at the moment checkpoint process starts (cp#writeLock has acquired). ClusterSnapshot process guarantees:
>  # there is no active transactions (or any data changes) in moment of writing begin CheckpointRecord.
>  # ClusterSnapshot consist of data pages that are materialized within this checkpoint process.
> Then every logical record after begin CheckointRecord doesn't belong to ClusterSnapshot. Then it's safe to write ClusterSnapshotRecord align with CheckpointRecord.
>  
> [1] [https://cwiki.apache.org/confluence/pages/editpage.action?pageId=211884314]



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