What do you mean by Kafka embedded broker?
Anyway, this could happen. For example, producer sends message to broker.
After that some network issue occurs and the producer did not got
confirmation from broker, so the producer thought the send failed. But the
broker actually got the message. The produce is expected to resend the
message, so broker will have duplicate messages, and that¹s also why we
say Kafka guarantees at least once.

-Jiangjie (Becket) Qin

On 3/3/15, 4:01 AM, "Arunkumar Srambikkal (asrambik)" <asram...@cisco.com>
wrote:

>Hi, 
>
>I'm running some tests with the Kafka embedded broker and I see cases
>where the producer gets the FailedToSendMessageException but in reality
>the message is transferred and consumer gets it
>
>Is this expected / known issue?
>
>Thanks
>Arun
>
>My producer config =
>
>    props.put("producer.type",         "sync")
>    props.put("serializer.class",      "kafka.serializer.StringEncoder");
>    props.put("partitioner.class",     "com.test.PartMe");
>    props.put("metadata.broker.list",  "127.0.0.1:"+port);
>    props.put("request.required.acks", "-1");
>    props.put("message.send.max.retries", "0")

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