Yun Gao created FLINK-23158:
-------------------------------
Summary: Source transformation is not added to the
StreamExecutionEnvironment explicitly
Key: FLINK-23158
URL: https://issues.apache.org/jira/browse/FLINK-23158
Project: Flink
Issue Type: Bug
Components: API / DataStream
Affects Versions: 1.14.0
Reporter: Yun Gao
Currently for the implementation of `StreamExecutionEnvironment#fromSource()`
and `StreamExecutionEnvironment#addSource()`, the SourceTransformation is not
added to the transformation list explicitly, this make the job with a single
source could not run directly. For example,
{code:java}
StreamExecutionEnvironment env =
StreamExecutionEnvironment.getExecutionEnvironment();
env.addSource(new SourceFunction<String>() {
@Override
public void run(SourceContext<String> sourceContext)
throws Exception {
}
@Override
public void cancel() {
}
});
env.execute();
{code}
would throws the exception:
{code:java}
Exception in thread "main" java.lang.IllegalStateException: No operators
defined in streaming topology. Cannot execute.
at
org.apache.flink.streaming.api.environment.StreamExecutionEnvironment.getStreamGraphGenerator(StreamExecutionEnvironment.java:2019)
at
org.apache.flink.streaming.api.environment.StreamExecutionEnvironment.getStreamGraph(StreamExecutionEnvironment.java:2010)
at
org.apache.flink.streaming.api.environment.StreamExecutionEnvironment.getStreamGraph(StreamExecutionEnvironment.java:1995)
at
org.apache.flink.streaming.api.environment.StreamExecutionEnvironment.execute(StreamExecutionEnvironment.java:1834)
at
org.apache.flink.streaming.api.environment.StreamExecutionEnvironment.execute(StreamExecutionEnvironment.java:1817)
at test.SingleSourceTest.main(SingleSourceTest.java:41)
{code}
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