beliefer commented on code in PR #26273:
URL: https://github.com/apache/flink/pull/26273#discussion_r1986297042


##########
flink-runtime/src/main/java/org/apache/flink/streaming/api/environment/StreamExecutionEnvironment.java:
##########
@@ -2218,7 +2218,9 @@ public static LocalStreamEnvironment 
createLocalEnvironment() {
      * @return A local execution environment with the specified parallelism.
      */
     public static LocalStreamEnvironment createLocalEnvironment(int 
parallelism) {
-        return createLocalEnvironment(parallelism, new Configuration());
+        Configuration configuration = new Configuration();
+        configuration.set(CoreOptions.DEFAULT_PARALLELISM, parallelism);
+        return createLocalEnvironment(configuration);

Review Comment:
   The set of Configuration returns the parameterized type.
   ```
       @Override
       public <T> Configuration set(ConfigOption<T> option, T value) {
           final boolean canBePrefixMap = canBePrefixMap(option);
           setValueInternal(option.key(), value, canBePrefixMap);
           return this;
       }
   ```



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