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[英]Error in kafka consumer while writing data from input topic to output topic using kafka streams
[英]Using kafka streams trying to write messages from input topic to output topic
下面是我嘗試將數據從一個主題寫入另一個主題的代碼邏輯。
//Computational logic
StreamsBuilder builder = new StreamsBuilder();
KStream<String, String> kStream = builder.stream(topicName_In);
kStream.foreach((k, v) -> System.out.println("Key = " + k + " Value = " + v));
//kStream.peek((k, v) -> System.out.println("Key = " + k + " Value = " + v));
kStream.to(topicName_Out);
Topology topology = builder.build();
輸入主題數據格式: Simple Message-1
錯誤
Exception in thread "HelloStreams-564343a1-1709-4bae-8fe5-514b37eee595-StreamThread-1" org.apache.kafka.streams.errors.StreamsException: Deserialization exception handler is set to fail upon a deserialization error. If you would rather have the streaming pipeline continue after a deserialization error, please set the default.deserialization.exception.handler appropriately.
at org.apache.kafka.streams.processor.internals.RecordDeserializer.deserialize(RecordDeserializer.java:80)
at org.apache.kafka.streams.processor.internals.RecordQueue.updateHead(RecordQueue.java:175)
at org.apache.kafka.streams.processor.internals.RecordQueue.addRawRecords(RecordQueue.java:112)
at org.apache.kafka.streams.processor.internals.PartitionGroup.addRawRecords(PartitionGroup.java:162)
at org.apache.kafka.streams.processor.internals.StreamTask.addRecords(StreamTask.java:765)
at org.apache.kafka.streams.processor.internals.StreamThread.addRecordsToTasks(StreamThread.java:943)
at org.apache.kafka.streams.processor.internals.StreamThread.runOnce(StreamThread.java:764)
at org.apache.kafka.streams.processor.internals.StreamThread.runLoop(StreamThread.java:697)
at org.apache.kafka.streams.processor.internals.StreamThread.run(StreamThread.java:670)
Caused by: org.apache.kafka.common.errors.SerializationException: Size of data received by IntegerDeserializer is not 4
鑒於這條線
KStream<String, String> kStream = builder.stream(topicName_In);
我假設您的輸入數據是字符串。
錯誤消息說
Size of data received by IntegerDeserializer is not 4
這表明您確實配置了IntegerSerde
(用於鍵和/或值),但您需要配置StringSerde
以使其工作。
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