I'm trying to use Apache Flink 1.6.0 to read some messages from a kafka topic, transform them and finally send them to another kafka topic. I use savepoints to save the state of the application in case of cancellation and restating. The problem is that I have duplication in reading the messages after restart. The kafka version is 011. Thanks for any helpful comment.
Duplicated messages reading via flink savepoints
262 Views Asked by Nastaran Motavalli At
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To avoid duplicates, it's necessary to pass
Semantic.EXACTLY_ONCEwhen setting up the kafka producer. See the documentation for more details concerning data loss and duplication when working with Kafka.