[jira] [Created] (KAFKA-7926) Issue with Kafka Broker - UnknownServerException

["Santosh S (JIRA)" <ji...@apache.org>]

Santosh S created KAFKA-7926:
--------------------------------

             Summary: Issue with Kafka Broker - UnknownServerException
                 Key: KAFKA-7926
                 URL: https://issues.apache.org/jira/browse/KAFKA-7926
             Project: Kafka
          Issue Type: Bug
          Components: core
         Environment: production
            Reporter: Santosh S


Our application uses `springBootVersion = 2.0.4.RELEASE` along with `compile('io.projectreactor.kafka:reactor-kafka:1.0.1.RELEASE')` dependency.

The Kafka Broker that we have is at version `1.0.1`.

Intermittently when we send the messages onto Kafka by creating `reactor.kafka.sender.SenderRecord` and in response of Kafka when look for `reactor.kafka.sender.SenderResult.exception()` we have

`java.lang.RuntimeException: org.apache.kafka.common.errors.UnknownServerException: The server experienced an unexpected error when processing the request` populated in the exception.

Upon retrying couple of times, the messages get through successfully.

On the broker logs the below error is being printed multiple times without any stacktrace

`[2019-02-08 15:43:07,501] ERROR [ReplicaManager broker=3] Error processing append operation on partition price-promotions-local-event-0 (kafka.server.ReplicaManager)
`

where `price-promotions-local-event` is our topic.

I have looked online but there is no definitive resolution or ways to triage this issue, many thanks in advance for any help.



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