Stephan Ewen created FLINK-1765:
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Summary: Reducer grouping is skippted when parallelism is one
Key: FLINK-1765
URL: https://issues.apache.org/jira/browse/FLINK-1765
Project: Flink
Issue Type: Bug
Components: Streaming
Affects Versions: 0.9
Reporter: Stephan Ewen
Fix For: 0.9
This program (not the parallelism) incorrectly runs a non grouped reduce and
fails with a NullPointerException.
{code}
StreamExecutionEnvironment env = ...
env.setDegreeOfParallelism(1);
DataStream<String> stream = env.addSource(...);
stream
.filter(...)
.map(...)
.groupBy("someField")
.reduce(new ReduceFunction() {...} )
.addSink(...);
env.execute();
{code}
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