reswqa commented on code in PR #22864:
URL: https://github.com/apache/flink/pull/22864#discussion_r1242160848
##########
flink-streaming-java/src/test/java/org/apache/flink/streaming/api/graph/StreamingJobGraphGeneratorTest.java:
##########
@@ -304,6 +304,35 @@ void testTransformationSetMaxParallelism() {
.isEqualTo(20);
}
+ /**
+ * Tests that the maxParallelism for an operator chain is correctly
determined as the minimal
+ * maxParallelism of all operators in the chain.
+ */
+ @Test
+ void testTransformationSetMinimalMaxParallelismForChain() {
+ StreamExecutionEnvironment env =
StreamExecutionEnvironment.getExecutionEnvironment();
+ env.setMaxParallelism(16);
+
+ DataStreamSource<Long> source = env.fromSequence(1L, 3L);
+ source.setParallelism(1)
+ .setMaxParallelism(128)
+ .map(i -> i)
+ .setParallelism(1)
+ .setMaxParallelism(1)
+ .print()
+ .setParallelism(1);
+
+ StreamGraph streamGraph = env.getStreamGraph();
+
+ List<JobVertex> vertices =
+
streamGraph.getJobGraph().getVerticesSortedTopologicallyFromSources();
+
+ assertThat(vertices.size()).isEqualTo(1);
Review Comment:
nit:
```suggestion
assertThat(vertices).hasSize(1);
```
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