Simon Fell created KAFKA-6554:

             Summary: Broker doesn't reject Produce request with inconsistent 
                 Key: KAFKA-6554
             Project: Kafka
          Issue Type: Bug
          Components: producer 
    Affects Versions: 1.0.0
            Reporter: Simon Fell
         Attachments: produce_v3.txt

Produce messages of type v3 have offset deltas in each record along with a 
LastOffsetDelta for the topic/partition set. In investigating an issue with 
missing offsets, I found a bug in a producer library where it would send 
multiple records, but leave LastOffsetDelta at 0. This causes various problems 
including holes in the offsets fetched by the consumer. 

As lastOffsetDelta can be computed by looking at the records, it seems like the 
broker should at least validate the LastOffsetDelta field against the contained 
records to stop this bad data getting in.

I've attached a decode v3 produce message that was causing the problems, and 
was accepted by the broker.

Here's a link to the issue in the kafka library we were using which has more 
context if you need it.



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