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https://issues.apache.org/jira/browse/HUDI-2119?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17394403#comment-17394403
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ASF GitHub Bot commented on HUDI-2119:
--------------------------------------
vinothchandar commented on a change in pull request #3210:
URL: https://github.com/apache/hudi/pull/3210#discussion_r683865065
##########
File path:
hudi-client/hudi-spark-client/src/test/java/org/apache/hudi/client/functional/TestHoodieBackedMetadata.java
##########
@@ -480,6 +482,131 @@ public void testRollbackUnsyncedCommit(HoodieTableType
tableType) throws Excepti
client.syncTableMetadata();
validateMetadata(client);
}
+
+ // If an unsynced commit is automatically rolled back during next commit,
the rollback commit gets a timestamp
+ // greater than than the new commit which is started. Ensure that in this
case the rollback is not processed
+ // as the earlier failed commit would not have been committed.
+ //
+ // Dataset: C1 C2 C3.inflight[failed] C4 R5[rolls
back C3]
+ // Metadata: C1.delta C2.delta
+ //
+ // When R5 completes, C3.xxx will be deleted. When C4 completes, C4 and R5
will be committed to Metadata Table in
Review comment:
I think we are doing this just for sake of maintaining this invariant
that, deleting a file that does not exist should be a fatal exception. I think
we can just relax this, instead of introducing more complexity.
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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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