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https://issues.apache.org/jira/browse/KAFKA-15609?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17777171#comment-17777171
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Luke Chen commented on KAFKA-15609:
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[~divijvaidya], do you know where the index file corrupted? In the end of the
file? Do you have any more info on this if we now think that's not related to
the "unflushed" data.
I just had a test to delay flush data when rolling the segments. And during the
delay, making sure the log segment and index files are uploaded to remote
storage. Under this case, client can still consume the data correctly.
So, I'm wondering what we're going to do with this ticket. More info about the
issue should help. If no, I think we can close this and re-open it if we
encounter similar issue and have more info. WDYT?
> Corrupted index uploaded to remote tier
> ---------------------------------------
>
> Key: KAFKA-15609
> URL: https://issues.apache.org/jira/browse/KAFKA-15609
> Project: Kafka
> Issue Type: Bug
> Components: Tiered-Storage
> Affects Versions: 3.6.0
> Reporter: Divij Vaidya
> Priority: Minor
>
> While testing Tiered Storage, we have observed corrupt indexes being present
> in remote tier. One such situation is covered here at
> https://issues.apache.org/jira/browse/KAFKA-15401. This Jira presents another
> such possible case of corruption.
> Potential cause of index corruption:
> We want to ensure that the file we are passing to RSM plugin contains all the
> data which is present in MemoryByteBuffer i.e. we should have flushed the
> MemoryByteBuffer to the file using force(). In Kafka, when we close a
> segment, indexes are flushed asynchronously [1]. Hence, it might be possible
> that when we are passing the file to RSM, the file doesn't contain flushed
> data. Hence, we may end up uploading indexes which haven't been flushed yet.
> Ideally, the contract should enforce that we force flush the content of
> MemoryByteBuffer before we give the file for RSM. This will ensure that
> indexes are not corrupted/incomplete.
> [1]
> [https://github.com/apache/kafka/blob/4150595b0a2e0f45f2827cebc60bcb6f6558745d/core/src/main/scala/kafka/log/UnifiedLog.scala#L1613]
>
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