[jira] [Commented] (KAFKA-17713) Ensure snapshots are aligned to batch boundaries

["Kevin Wu (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/KAFKA-17713?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17887418#comment-17887418 ] 

Kevin Wu commented on KAFKA-17713:
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It seems like I can't assign this issue to myself. How can I get added to the kafka group on jira?

> Ensure snapshots are aligned to batch boundaries
> ------------------------------------------------
>
>                 Key: KAFKA-17713
>                 URL: https://issues.apache.org/jira/browse/KAFKA-17713
>             Project: Kafka
>          Issue Type: Bug
>            Reporter: Kevin Wu
>            Priority: Major
>
> In the case of a metadata transaction that is started in the middle of the record batch, the records preceding the BeginTransactionRecord in the batch are flushed. This means the SnapshotGenerator can emit a snapshot whose fetch offset (lastContainedOffset + 1) "X" is not aligned to a batch boundary. This can result in followers/observers that fetch and apply this bad snapshot to be unable to successfully fetch thereafter since the follower will reject the fetched record batch that contains offset X (starting at offset X - M), since X - M < X.



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