[
https://issues.apache.org/jira/browse/FLINK-9141?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Chesnay Schepler updated FLINK-9141:
------------------------------------
Description:
Calling both {{getSideOutput()}} and {{split()}} on one DataStream causes a
{{NullPointerException}} to be thrown at runtime.
As a 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
.split(Collections::singletonList)
.select("bar")
.print();
env.execute();
}
{code}
was:
Calling both {{getSideOutput()}} and {{split()}} on one DataStream causes a
{{NullPointerException}} to be thrown at runtime.
As a 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}
> 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
> Assignee: vinoyang
> Priority: Critical
>
> Calling both {{getSideOutput()}} and {{split()}} on one DataStream causes a
> {{NullPointerException}} to be thrown at runtime.
> As a 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
> .split(Collections::singletonList)
> .select("bar")
> .print();
> env.execute();
> }
> {code}
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