Tom Wells created FLINK-17578:
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Summary: Union of 2 SideOutputs behaviour incorrect
Key: FLINK-17578
URL:
https://issues.apache.org/jira/browse/FLINK-17578 Project: Flink
Issue Type: Bug
Components: API / DataStream
Affects Versions: 1.10.0
Reporter: Tom Wells
Strange behaviour when using union() to merge outputs of 2 DataStreams, where both are sourced from SideOutputs.
See example code with comments demonstrating the issue:
{code:java}
// code placeholder
def main(args: Array[String]): Unit = {
val env: StreamExecutionEnvironment = StreamExecutionEnvironment.getExecutionEnvironment
val input = env.fromElements(1, 2, 3, 4)
val oddTag = OutputTag[Int]("odds")
val evenTag = OutputTag[Int]("even")
val all =
input.process {
(value: Int, ctx: ProcessFunction[Int, Int]#Context, out: Collector[Int]) => {
if (value % 2 != 0)
ctx.output(oddTag, value)
else
ctx.output(evenTag, value)
}
}
val odds = all.getSideOutput(oddTag)
val evens = all.getSideOutput(evenTag)
// These print correctly
//
odds.print // -> 1, 3
evens.print // -> 2, 4
// This prints incorrectly - BUG?
//
odds.union(evens).print // -> 2, 2, 4, 4
evens.union(odds).print // -> 1, 1, 3, 3
// Another test to understand normal behaviour of .union, using normal inputs
//
val odds1 = env.fromElements(1, 3)
val evens1 = env.fromElements(2, 4)
// Union of 2 normal inputs
//
odds1.union(evens1).print // -> 1, 2, 3, 4
// Union of a normal input plus an input from a sideoutput
//
odds.union(evens1).print // -> 1, 2, 3, 4
evens1.union(odds).print // -> 1, 2, 3, 4
//
// So it seems that when both inputs are from sideoutputs that it behaves incorrectly... BUG?
env.execute("Test job")
}
{code}
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