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https://issues.apache.org/jira/browse/FLINK-5031?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15678716#comment-15678716
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Renkai Ge commented on FLINK-5031:
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[~fhueske]The second split was not ignored, it was unioned by the first
one.{code}union({1,2},{1,2,3,4,5})={1,2,3,4,5}{code},if the second select
change to "GreaterEqual", the result would be {3,4,5,6,7,8,9,10,11},that was
{code} union({3,4,5,6,7,8,9,10,11},{6,7,8,9,10,11}) {code} see
https://github.com/apache/flink/blob/a612b9966f3ee020a5721ac2f039a3633c40146c/flink-streaming-java/src/main/java/org/apache/flink/streaming/api/collector/selector/DirectedOutput.java#L114.
In the current implementation of split, you will get a unioned result of all
split&select combination, I think it was strange somehow.We might solve this
issue by reimplement the split function by an OneInputTransformation.
> Consecutive DataStream.split() ignored
> --------------------------------------
>
> Key: FLINK-5031
> URL: https://issues.apache.org/jira/browse/FLINK-5031
> Project: Flink
> Issue Type: Bug
> Components: Streaming
> Affects Versions: 1.2.0, 1.1.3
> Reporter: Fabian Hueske
> Assignee: Renkai Ge
> Fix For: 1.2.0
>
>
> The output of the following program
> {code}
> static final class ThresholdSelector implements OutputSelector<Long> {
> long threshold;
> public ThresholdSelector(long threshold) {
> this.threshold = threshold;
> }
> @Override
> public Iterable<String> select(Long value) {
> if (value < threshold) {
> return Collections.singletonList("Less");
> } else {
> return Collections.singletonList("GreaterEqual");
> }
> }
> }
> public static void main(String[] args) throws Exception {
> StreamExecutionEnvironment env =
> StreamExecutionEnvironment.getExecutionEnvironment();
> env.setParallelism(1);
> SplitStream<Long> split1 = env.generateSequence(1, 11)
> .split(new ThresholdSelector(6));
> // stream11 should be [1,2,3,4,5]
> DataStream<Long> stream11 = split1.select("Less");
> SplitStream<Long> split2 = stream11
> // .map(new MapFunction<Long, Long>() {
> // @Override
> // public Long map(Long value) throws Exception {
> // return value;
> // }
> // })
> .split(new ThresholdSelector(3));
> DataStream<Long> stream21 = split2.select("Less");
> // stream21 should be [1,2]
> stream21.print();
> env.execute();
> }
> {code}
> should be {{1, 2}}, however it is {{1, 2, 3, 4, 5}}. It seems that the second
> {{split}} operation is ignored.
> The program is correctly evaluate if the identity {{MapFunction}} is added to
> the program.
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