 <p>This is not a bug but an unsupported feature. It is currently not possible to set the parallelism for a single operator, but only the complete job.</p> <p>I have opened a JIRA for this: <a href="https://issues.apache.org/jira/browse/FLINK-3275" rel="nofollow">https://issues.apache.org/jira/browse/FLINK-3275</a></p>