Github user greghogan commented on a diff in the pull request:
https://github.com/apache/flink/pull/3616#discussion_r108948674
--- 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 --
`PARALLELISM_UNKNOWN` was removed in FLINK-3980. Not sure why it was added
back unless this was unintentional.
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