Github user kl0u commented on a diff in the pull request: https://github.com/apache/flink/pull/3616#discussion_r108956486 --- Diff: flink-streaming-java/src/main/java/org/apache/flink/streaming/api/transformations/StreamTransformation.java --- @@ -202,7 +203,17 @@ public int getParallelism() { * @param parallelism The new parallelism to set on this {@code StreamTransformation} */ public void setParallelism(int parallelism) { - Preconditions.checkArgument(parallelism > 0, "Parallelism must be bigger than zero."); + checkArgument(parallelism != ExecutionConfig.PARALLELISM_UNKNOWN, "Cannot specify UNKNOWN_PARALLELISM."); --- End diff -- @greghogan I see. so I suppose we could remove it. This will simplify the checks here a bit.
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