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https://issues.apache.org/jira/browse/KAFKA-12841?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17372984#comment-17372984
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Kirk True commented on KAFKA-12841:
-----------------------------------
There are some conditions inside the {{KafkaProducer}}'s {{doSend}} method that
will result in an {{ApiException}} being thrown before the {{TopicPartition}}
({{tp}}) is created. As a result, {{tp}} is null and case #2 listed in the
initial bug report occurs.
Would it be OK to create a new, "dummy" {{TopicPartition}} in this case? We
could use the topic from the {{ProducerRecord}}. But perhaps the partition from
the {{ProducerRecord}}, if non-null, can be used? Or should we just set the
partition to `-1`?
> NPE from the provided metadata in client callback in case of ApiException
> -------------------------------------------------------------------------
>
> Key: KAFKA-12841
> URL: https://issues.apache.org/jira/browse/KAFKA-12841
> Project: Kafka
> Issue Type: Bug
> Components: clients
> Affects Versions: 2.6.0
> Environment: Prod
> Reporter: Avi Youkhananov
> Priority: Major
> Attachments: NPE.production
>
>
> 1.
> org.apache.kafka.clients.producer.Callback interface has method
> onCompletion(...)
> Which says as part of the documentation :
> *The metadata for the record that was sent (i.e. the partition and offset).
> *An empty metadata with -1 value for all fields* except for topicPartition
> will be returned if an error occurred.
> We got an NPE from doSend(...) method in
> org.apache.kafka.clients.producer.KafkaProducer
> Which can occur in case ApiException was thrown ...
> In case of ApiException it uses the regular callback instead of
> InterceptorCallback which also may cover the NPE.
> 2. More over RecordMetadata has method partition() which return int but can
> also throw NPE because TopicPartition might be null.
> Stack trace attached.
>
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