xintongsong commented on a change in pull request #15279:
URL: https://github.com/apache/flink/pull/15279#discussion_r597521289



##########
File path: 
flink-runtime/src/test/java/org/apache/flink/runtime/resourcemanager/active/ActiveResourceManagerFactoryTest.java
##########
@@ -47,19 +46,19 @@
     private static final MemorySize TOTAL_FLINK_SIZE = 
MemorySize.ofMebiBytes(2 * 1024);
     private static final MemorySize TOTAL_PROCESS_SIZE = 
MemorySize.ofMebiBytes(3 * 1024);
 
-    private static Map<String, String> systemEnv;
+    private static Properties systemProperties;
 
     @BeforeClass
     public static void setupClass() {
-        systemEnv = System.getenv();
+        systemProperties = System.getProperties();
         System.clearProperty("flink.tests.disable-declarative");
         System.clearProperty("flink.tests.enable-fine-grained");

Review comment:
       In this test class, we expect getting different effective 
configurations, depending on whether fine-grained resource management is 
activated or not. Thus we want this class to have fully control which slot 
manager is used, without being affected by the properties for the CI stage.




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