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https://issues.apache.org/jira/browse/HUDI-3342?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Sagar Sumit updated HUDI-3342:
------------------------------
Sprint: Hudi-Sprint-Mar-07, Hudi-Sprint-Mar-14, Hudi-Sprint-Mar-21,
2022/08/22 (was: Hudi-Sprint-Mar-07, Hudi-Sprint-Mar-14, Hudi-Sprint-Mar-21)
> 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: Critical
> Fix For: 0.12.1
>
>
> 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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