Luis Araujo created KAFKA-10334:
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             Summary: Transactions not working properly
                 Key: KAFKA-10334
                 URL: https://issues.apache.org/jira/browse/KAFKA-10334
             Project: Kafka
          Issue Type: Bug
          Components: producer 
    Affects Versions: 2.3.0, 2.1.0
            Reporter: Luis Araujo


I'm using transactions provided by Kafka Producer API in a Scala project built 
with SBT. The dependency used in the project is: 

"org.apache.kafka" % "kafka-clients" % "2.1.0"

I followed the documentation and I was expecting that transactions fail when I 
call .commitTransaction if some problem is raised when sending a message like 
it's described in the documentation: 
[https://kafka.apache.org/10/javadoc/org/apache/kafka/clients/producer/KafkaProducer.html
]

Unfortunatelly, when testing this behaviour using a message larger than the 
size accepted by the Kafka broker/cluster, the transactions are not working 
properly.

I tested with a 3 Kafka broker cluster with 1MB message max size (default 
value):
- when the message has 1MB, the transaction is aborted and an exception is 
raised when calling commitTransaction()
- when the message is bigger than 1MB, the transaction is completed 
successfully without the message being written. no exception is thrown.

As an example, this means that when I produce 9 messages with 1 KB and 1 
message with 1.1MB in the same transaction, the transaction is completed but 
only 9 messages are written to the Kafka cluster.

I tested this behaviour with Kafka version 2.1.0 and 2.3.0 in both Kafka 
cluster and Kafka Producer API.



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