Kevin Wu created KAFKA-17713:
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             Summary: 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


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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