[jira] [Assigned] (HUDI-3342) MOR Delta Block Rollbacks not applied if Lazy Block reading is disabled

["Raymond Xu (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HUDI-3342?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Raymond Xu reassigned HUDI-3342:
--------------------------------

    Assignee: Forward Xu

> MOR Delta Block Rollbacks not applied if Lazy Block reading is disabled
> -----------------------------------------------------------------------
>
>                 Key: HUDI-3342
>                 URL: https://issues.apache.org/jira/browse/HUDI-3342
>             Project: Apache Hudi
>          Issue Type: Bug
>          Components: metadata
>            Reporter: Alexey Kudinkin
>            Assignee: Forward Xu
>            Priority: Blocker
>             Fix For: 0.11.0
>
>
> While working on HUDI-3322, i've spotted following contraption:
> When we are rolling back Delta Commits, we add corresponding {{ROLLBACK_PREVIOUS_BLOCK}} Command Block at the back of the "queue". When we restore, we issue a sequence of Rollbacks, which means that stack if such Rollback Blocks could be of size > 1.
> However, when reading that MOR table if the reader does not specify `readBlocksLazily=true`, we'd be merging Blocks eagerly (when instants increment) therefore essentially rendering such Rollback Blocks useless since they can't "unmerge" previously merged records, resurrecting the data that was supposed to be rolled back.



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