Hi Stephan, Thank you for answering my question.
I try option 2 and it gives me correct results reading several sources, while using ParallelSourceFunction it gives 4 times redundancy (same as my number of threads). Can I ask what would be the reason causing the difference? I think I don't understand SourceFunction and ParallelSourceFunction correctly. Best, Sendoh -- View this message in context: http://apache-flink-user-mailing-list-archive.2336050.n4.nabble.com/Better-way-to-read-several-stream-sources-tp11224p11270.html Sent from the Apache Flink User Mailing List archive. mailing list archive at Nabble.com.