Flink Data Stream Union

Posted by flinkuser on
URL: http://deprecated-apache-flink-user-mailing-list-archive.369.s1.nabble.com/Flink-Data-Stream-Union-tp3169.html


Here is my code snippet but I find the union operator not workable.
 
DataStream<String> msgDataStream1 = env.addSource((new SocketSource(hostName1,port,'\n',-1))).filter(new MessageFilter()).setParallelism(1);
DataStream<String> msgDataStream2 = env.addSource((new SocketSource(hostName2,port,'\n',-1))).filter(new MessageFilter()).setParallelism(1);
 
 
DataStream<String> stockStream = (msgDataStream1.union(msgDataStream2)).iterate();
                                                stockStream.print();
 
 
The stockStream doesn’t print the consolidated stream data. Sometimes Stream1 is printed, sometimes none is printed.
 
Can you please help me out, as of what is wrong here.