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https://issues.apache.org/jira/browse/FLINK-6928?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16050925#comment-16050925
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Erik van Oosten edited comment on FLINK-6928 at 6/15/17 6:39 PM:
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In my ideal world method {{getTargetTopic}} would be removed from
{{*SerializationSchema}} and moved to a new interface, e.g.
{{DestinationTopic}}.
Then there are two constructor variants for {{FlinkKafkaProducer}}: one would
take a topic ({{String}}), the other would take a {{DestinationTopic}}. Both
would have the simplified {{*SerializationSchema}} as argument. To make things
simple internally, the first variant could wrap the topic in a implementation
of {{DestinationTopic}} that always returns the same topic.
was (Author: erikvanoosten):
In my ideal world method {{getTargetTopic}} would be removed from
{{SerializationSchema}} and moved to a new interface, e.g. {{DestinationTopic}}.
Then there are two constructor variants for {{FlinkKafkaProducer}}: one would
take a topic ({{String}}), the other would take a {{DestinationTopic}}. Both
would have the simplified {{SerializationSchema}} as argument. To make things
simple internally, the first variant could wrap the topic in a implementation
of {{DestinationTopic}} that always returns the same topic.
> Kafka sink: default topic should not need to exist
> --------------------------------------------------
>
> Key: FLINK-6928
> URL: https://issues.apache.org/jira/browse/FLINK-6928
> Project: Flink
> Issue Type: Bug
> Components: Kafka Connector
> Affects Versions: 1.3.0, 1.2.1
> Reporter: Erik van Oosten
>
> When using a Kafka sink, the defaultTopic needs to exist even when it is
> never used. It would be nice if fetching partition information for the
> default topic would be delayed until the moment a topic is actually used.
> Cause: {{FlinkKafkaProducerBase.open}} fetches partition information for the
> default topic.
> In addition, it would be nice if we could signal that the defaultTopic is not
> needed by passing {{null}}. Currently, a value for the defaultTopic is
> required.
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