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https://issues.apache.org/jira/browse/FLINK-18960?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17177703#comment-17177703
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Dawid Wysakowicz commented on FLINK-18960:
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English is the language used in JIRA tickets. Could you please update the
ticket to English [~xiaohang.li] ?
> flink sideoutput union
> ----------------------
>
> Key: FLINK-18960
> URL: https://issues.apache.org/jira/browse/FLINK-18960
> Project: Flink
> Issue Type: Bug
> Components: API / DataStream
> Affects Versions: 1.10.1
> Reporter: xiaohang.li
> Priority: Minor
>
> flink sideoutput
> union操作时数据出现问题。从主流分出来的侧输出流进行union操作时，显示输出的是以最后一个union的数据流结果*union的次数
>
> val side = new OutputTag[String]("side")
> val side2 = new OutputTag[String]("side2")
> val side3 = new OutputTag[String]("side3")
> val ds = env.socketTextStream("master",9001)
> val res = ds.process(new ProcessFunction[String,String] {
> override def processElement(value: String, ctx: ProcessFunction[String,
> String]#Context, out: Collector[String]): Unit = {
> if(value.contains("hello"))
> { ctx.output(side,value) }
> else if(value.contains("world"))
> { ctx.output(side2,value) }
> else if(value.contains("flink"))
> { ctx.output(side3,value) }
> out.collect(value)
> }
> })
> val res1 = res.getSideOutput(side)
> val res2 = res.getSideOutput(side2)
> val res3 = res.getSideOutput(side3)
> println( "====>"+res1.getClass)
> println( "====>"+res2.getClass)
> res1.print("res1")
> res2.print("res2")
> res3.print("res3")
> res2.union(res1).union(res3).print("all")
>
>
>
> 在socket端口分别输入
> hello
> world
> flink
>
> idea显示数据如下
> res1> hello
> res2> world
> res3> flink
> all> flink
> all> flink
> all> flink
>
> 可见在all输出流显示的是最后一个union的侧输出流*union的次数，实际显示应为
> all>flink
> 如果分别再对每个侧输出流进行map操作后再执行上面的代码即显示正确的数据输出，但是这一步操作应该是非必须的
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