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https://issues.apache.org/jira/browse/HUDI-2119?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17398202#comment-17398202
]
ASF GitHub Bot commented on HUDI-2119:
--------------------------------------
hudi-bot edited a comment on pull request #3210:
URL: https://github.com/apache/hudi/pull/3210#issuecomment-872541566
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> Syncing of rollbacks to metadata table does not work in all cases
> -----------------------------------------------------------------
>
> Key: HUDI-2119
> URL: https://issues.apache.org/jira/browse/HUDI-2119
> Project: Apache Hudi
> Issue Type: Bug
> Reporter: Prashant Wason
> Assignee: Prashant Wason
> Priority: Blocker
> Labels: pull-request-available, release-blocker
> Fix For: 0.9.0
>
>
> This is an issue with inline automatic rollbacks.
> Metadata table assumes that a rollbacks is to be applied if the
> instant-being-rolled back has a timestamp less than the last deltacommit time
> on the metadata timeline. We do not explicitly check if the
> instant-being-rolled-back was actually written to metadata table.
> **A rollback adds a record to metadata table which "deletes" files from a
> failed/earlier commit. If the files being deleted were never actually
> committed to metadata table earlier, the deletes cannot be consolidated
> during metadata table reads. This leads to a HoodieMetadataException as we
> cannot differentiate this from a bug where we might have missed committing a
> commit to metadata table.
>
>
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