Chesnay Schepler created FLINK-9141:
---------------------------------------
Summary: Calling getSideOutput() and split() on one DataStream
causes NPE
Key: FLINK-9141
URL: https://issues.apache.org/jira/browse/FLINK-9141
Project: Flink
Issue Type: Bug
Components: DataStream API
Affects Versions: 1.4.0
Reporter: Chesnay Schepler
Calling both {{getSideOutput()}} and {{split()}} on one DataStream causes a
{{NullPointerException}} to be thrown.
As a temporary work-around one can add a no-op map function before the split()
call.
Exception:
{code}
Caused by: java.lang.NullPointerException
at
org.apache.flink.streaming.api.collector.selector.DirectedOutput.<init>(DirectedOutput.java:79)
at
org.apache.flink.streaming.runtime.tasks.OperatorChain.createOutputCollector(OperatorChain.java:326)
at
org.apache.flink.streaming.runtime.tasks.OperatorChain.<init>(OperatorChain.java:128)
at
org.apache.flink.streaming.runtime.tasks.StreamTask.invoke(StreamTask.java:274)
at org.apache.flink.runtime.taskmanager.Task.run(Task.java:702)
at java.lang.Thread.run(Thread.java:745)
{code}
Reproducer:
{code}
private static final OutputTag<String> tag = new OutputTag<String>("tag") {};
public static void main(String[] args) throws Exception {
StreamExecutionEnvironment env =
StreamExecutionEnvironment.getExecutionEnvironment();
DataStream<String> dataStream1 = env.fromElements("foo");
SingleOutputStreamOperator<String> processedStream = dataStream1
.process(new ProcessFunction<String, String>() {
@Override
public void processElement(String value, Context ctx,
Collector<String> out) {
}
});
processedStream.getSideOutput(tag)
.print();
processedStream
.map(record -> record)
.split(Collections::singletonList)
.select("bar")
.print();
env.execute();
}
{code}
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