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

["Alexey Kudinkin (Jira)" <ji...@apache.org>]

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

Alexey Kudinkin updated HUDI-3342:
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    Summary: MOR Delta Block Rollbacks not applied if Lazy Block reading is disabled  (was: MOR Delta Block rollbacks is not working correctly if lazy Block reading is disabled)

> 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
>            Reporter: Alexey Kudinkin
>            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".
> However, when reading that MOR table if the reader does not specify `readBlocksLazily=true`, we'd be merging Blocks eagerly therefore essentially rendering such Rollback Blocks useless, resurrecting the data that was previously rolled back.



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