[jira] [Assigned] (KAFKA-17801) RemoteLogManager may compute inaccurate upperBoundOffset for aborted txns

["Kamal Chandraprakash (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/KAFKA-17801?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Kamal Chandraprakash reassigned KAFKA-17801:
--------------------------------------------

    Assignee: Kamal Chandraprakash

> RemoteLogManager may compute inaccurate upperBoundOffset for aborted txns
> -------------------------------------------------------------------------
>
>                 Key: KAFKA-17801
>                 URL: https://issues.apache.org/jira/browse/KAFKA-17801
>             Project: Kafka
>          Issue Type: Bug
>          Components: core
>    Affects Versions: 3.6.0
>            Reporter: Jun Rao
>            Assignee: Kamal Chandraprakash
>            Priority: Major
>
> In RemoteLogManager.read, we compute startPos as the following.
> {code:java}
> startPos = lookupPositionForOffset(remoteLogSegmentMetadata, offset);{code}
> This is the position returned by the offset index. The actual position for the first batch being read happens in the following, but startPos is not updated accordingly.
> {code:java}
> firstBatch = findFirstBatch(remoteLogInputStream, offset);{code}
> We then use the inaccurate startPos to create fetchDataInfo.
> {code:java}
> FetchDataInfo fetchDataInfo = new FetchDataInfo(
> new LogOffsetMetadata(offset, remoteLogSegmentMetadata.startOffset(), startPos),
> MemoryRecords.readableRecords(buffer));{code}
> In addAbortedTransactions(), we use startPos to find the upperBoundOffset to retrieve the aborted txns.
> {code:java}
> long upperBoundOffset = offsetIndex.fetchUpperBoundOffset(startOffsetPosition, fetchSize)
> .map(position -> position.offset).orElse(segmentMetadata.endOffset() + 1);{code}
> The inaccurate startPos can lead to inaccurate upperBoundOffset, which leads to inaccurate aborted txns returned to the consumer.



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