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

["Maksim Timonin (Jira)" <ji...@apache.org>]

Maksim Timonin created IGNITE-17215:
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             Summary: 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


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 in the moment begin CheckpointRecord has written to WAL. 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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