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https://issues.apache.org/jira/browse/FLINK-16580?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17058560#comment-17058560
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Aljoscha Krettek commented on FLINK-16580:
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Please use the mailing lists for questions about implementation in the future:
https://flink.apache.org/community.html#mailing-lists
To answer your question: we always set a {{ByteArrayDeserializer}} because
Flink has its own (de)serializer abstractions, {{DeserializationSchema}}, which
always deserializes from a byte array.
> flink-connector-kafka desrializer
> ---------------------------------
>
> Key: FLINK-16580
> URL: https://issues.apache.org/jira/browse/FLINK-16580
> Project: Flink
> Issue Type: Wish
> Components: Connectors / Kafka
> Affects Versions: 1.10.0
> Reporter: 李开青
> Priority: Major
>
> FlinkKafkaConsumer.setDeserializer(Properties props)
> Why is ByteArrayDeserializer.class mandatory?
> I found the flink sql conf "connector.properties.key.deserializer" will lose
> efficacy
>
> private static void setDeserializer(Properties props) {
> final String deSerName = ByteArrayDeserializer.class.getName();
> Object keyDeSer = props.get(ConsumerConfig.KEY_DESERIALIZER_CLASS_CONFIG);
> Object valDeSer = props.get(ConsumerConfig.VALUE_DESERIALIZER_CLASS_CONFIG);
> if (keyDeSer != null && !keyDeSer.equals(deSerName)) {
> LOG.warn("Ignoring configured key DeSerializer ({})",
> ConsumerConfig.KEY_DESERIALIZER_CLASS_CONFIG);
> }
> if (valDeSer != null && !valDeSer.equals(deSerName)) {
> LOG.warn("Ignoring configured value DeSerializer ({})",
> ConsumerConfig.VALUE_DESERIALIZER_CLASS_CONFIG);
> }
> props.put(ConsumerConfig.KEY_DESERIALIZER_CLASS_CONFIG, deSerName);
> props.put(ConsumerConfig.VALUE_DESERIALIZER_CLASS_CONFIG, deSerName);
> }
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