diff --git a/dolphinscheduler-server/src/test/java/org/apache/dolphinscheduler/server/master/dispatch/host/assign/RoundRobinSelectorTest.java b/dolphinscheduler-server/src/test/java/org/apache/dolphinscheduler/server/master/dispatch/host/assign/RoundRobinSelectorTest.java
index 9e41cd68bf..31eac07270 100644
--- a/dolphinscheduler-server/src/test/java/org/apache/dolphinscheduler/server/master/dispatch/host/assign/RoundRobinSelectorTest.java
+++ b/dolphinscheduler-server/src/test/java/org/apache/dolphinscheduler/server/master/dispatch/host/assign/RoundRobinSelectorTest.java
@@ -40,41 +40,81 @@ public class RoundRobinSelectorTest {
     public void testSelect1() {
         RoundRobinSelector selector = new RoundRobinSelector();
         Host result;
-        result = selector.select(Arrays.asList(new Host("192.168.1.1", 80, 20, System.currentTimeMillis(), "kris"), new Host("192.168.1.2", 80, 10, System.currentTimeMillis(), "kris")));
+        result = selector.select(Arrays.asList(
+                new Host("192.168.1.1", 80, 20, System.currentTimeMillis(), "kris"),
+                new Host("192.168.1.2", 80, 10, System.currentTimeMillis(), "kris")));
         Assert.assertEquals("192.168.1.1", result.getIp());
-        result = selector.select(Arrays.asList(new Host("192.168.1.1", 80, 20, System.currentTimeMillis(), "kris"), new Host("192.168.1.2", 80, 10, System.currentTimeMillis(), "kris")));
+
+        result = selector.select(Arrays.asList(
+                new Host("192.168.1.1", 80, 20, System.currentTimeMillis(), "kris"),
+                new Host("192.168.1.2", 80, 10, System.currentTimeMillis(), "kris")));
         Assert.assertEquals("192.168.1.2", result.getIp());
-        result = selector.select(Arrays.asList(new Host("192.168.1.1", 80, 20, System.currentTimeMillis(), "kris"), new Host("192.168.1.2", 80, 10, System.currentTimeMillis(), "kris")));
+
+        result = selector.select(Arrays.asList(
+                new Host("192.168.1.1", 80, 20, System.currentTimeMillis(), "kris"),
+                new Host("192.168.1.2", 80, 10, System.currentTimeMillis(), "kris")));
         Assert.assertEquals("192.168.1.1", result.getIp());
+
         // add new host
-        result = selector.select(Arrays.asList(new Host("192.168.1.1", 80, 20, System.currentTimeMillis(), "kris"), new Host("192.168.1.2", 80, 10, System.currentTimeMillis(), "kris")));
+        result = selector.select(Arrays.asList(
+                new Host("192.168.1.1", 80, 20, System.currentTimeMillis(), "kris"),
+                new Host("192.168.1.2", 80, 10, System.currentTimeMillis(), "kris")));
         Assert.assertEquals("192.168.1.1", result.getIp());
-        result = selector.select(Arrays.asList(new Host("192.168.1.1", 80, 20, System.currentTimeMillis(), "kris"), new Host("192.168.1.2", 80, 10, System.currentTimeMillis(), "kris")));
+
+        result = selector.select(Arrays.asList(
+                new Host("192.168.1.1", 80, 20, System.currentTimeMillis(), "kris"),
+                new Host("192.168.1.2", 80, 10, System.currentTimeMillis(), "kris")));
         Assert.assertEquals("192.168.1.2", result.getIp());
-        result = selector.select(Arrays.asList(new Host("192.168.1.1", 80, 20, System.currentTimeMillis(), "kris"), new Host("192.168.1.2", 80, 10, System.currentTimeMillis(), "kris"),
-            new Host("192.168.1.3", 80, 10, System.currentTimeMillis(), "kris")));
+
+        result = selector.select(Arrays.asList(
+                new Host("192.168.1.1", 80, 20, System.currentTimeMillis(), "kris"),
+                new Host("192.168.1.2", 80, 10, System.currentTimeMillis(), "kris"),
+                new Host("192.168.1.3", 80, 10, System.currentTimeMillis(), "kris")));
         Assert.assertEquals("192.168.1.1", result.getIp());
-        result = selector.select(Arrays.asList(new Host("192.168.1.1", 80, 20, System.currentTimeMillis(), "kris"), new Host("192.168.1.2", 80, 10, System.currentTimeMillis(), "kris"),
-            new Host("192.168.1.3", 80, 10, System.currentTimeMillis(), "kris")));
+
+        result = selector.select(Arrays.asList(
+                new Host("192.168.1.1", 80, 20, System.currentTimeMillis(), "kris"),
+                new Host("192.168.1.2", 80, 10, System.currentTimeMillis(), "kris"),
+                new Host("192.168.1.3", 80, 10, System.currentTimeMillis(), "kris")));
         Assert.assertEquals("192.168.1.3", result.getIp());
-        result = selector.select(Arrays.asList(new Host("192.168.1.1", 80, 20, System.currentTimeMillis(), "kris"), new Host("192.168.1.2", 80, 10, System.currentTimeMillis(), "kris"),
-            new Host("192.168.1.3", 80, 10, System.currentTimeMillis(), "kris")));
+
+        result = selector.select(Arrays.asList(
+                new Host("192.168.1.1", 80, 20, System.currentTimeMillis(), "kris"),
+                new Host("192.168.1.2", 80, 10, System.currentTimeMillis(), "kris"),
+                new Host("192.168.1.3", 80, 10, System.currentTimeMillis(), "kris")));
         Assert.assertEquals("192.168.1.1", result.getIp());
-        result = selector.select(Arrays.asList(new Host("192.168.1.1", 80, 20, System.currentTimeMillis(), "kris"), new Host("192.168.1.2", 80, 10, System.currentTimeMillis(), "kris"),
-            new Host("192.168.1.3", 80, 10, System.currentTimeMillis(), "kris")));
+
+        result = selector.select(Arrays.asList(
+                new Host("192.168.1.1", 80, 20, System.currentTimeMillis(), "kris"),
+                new Host("192.168.1.2", 80, 10, System.currentTimeMillis(), "kris"),
+                new Host("192.168.1.3", 80, 10, System.currentTimeMillis(), "kris")));
         Assert.assertEquals("192.168.1.2", result.getIp());
-        result = selector.select(Arrays.asList(new Host("192.168.1.1", 80, 20, System.currentTimeMillis(), "kris"), new Host("192.168.1.2", 80, 10, System.currentTimeMillis(), "kris"),
-            new Host("192.168.1.3", 80, 10, System.currentTimeMillis(), "kris")));
+        result = selector.select(Arrays.asList(
+                new Host("192.168.1.1", 80, 20, System.currentTimeMillis(), "kris"),
+                new Host("192.168.1.2", 80, 10, System.currentTimeMillis(), "kris"),
+                new Host("192.168.1.3", 80, 10, System.currentTimeMillis(), "kris")));
         Assert.assertEquals("192.168.1.1", result.getIp());
-        result = selector.select(Arrays.asList(new Host("192.168.1.1", 80, 20, System.currentTimeMillis(), "kris"), new Host("192.168.1.2", 80, 10, System.currentTimeMillis(), "kris"),
-            new Host("192.168.1.3", 80, 10, System.currentTimeMillis(), "kris")));
+
+        result = selector.select(Arrays.asList(
+                new Host("192.168.1.1", 80, 20, System.currentTimeMillis(), "kris"),
+                new Host("192.168.1.2", 80, 10, System.currentTimeMillis(), "kris"),
+                new Host("192.168.1.3", 80, 10, System.currentTimeMillis(), "kris")));
         Assert.assertEquals("192.168.1.3", result.getIp());
+
         // remove host3
-        result = selector.select(Arrays.asList(new Host("192.168.1.1", 80, 20, System.currentTimeMillis(), "kris"), new Host("192.168.1.2", 80, 10, System.currentTimeMillis(), "kris")));
+        result = selector.select(Arrays.asList(
+                new Host("192.168.1.1", 80, 20, System.currentTimeMillis(), "kris"),
+                new Host("192.168.1.2", 80, 10, System.currentTimeMillis(), "kris")));
         Assert.assertEquals("192.168.1.1", result.getIp());
-        result = selector.select(Arrays.asList(new Host("192.168.1.1", 80, 20, System.currentTimeMillis(), "kris"), new Host("192.168.1.2", 80, 10, System.currentTimeMillis(), "kris")));
+
+        result = selector.select(Arrays.asList(
+                new Host("192.168.1.1", 80, 20, System.currentTimeMillis(), "kris"),
+                new Host("192.168.1.2", 80, 10, System.currentTimeMillis(), "kris")));
         Assert.assertEquals("192.168.1.2", result.getIp());
-        result = selector.select(Arrays.asList(new Host("192.168.1.1", 80, 20, System.currentTimeMillis(), "kris"), new Host("192.168.1.2", 80, 10, System.currentTimeMillis(), "kris")));
+
+        result = selector.select(Arrays.asList(
+                new Host("192.168.1.1", 80, 20, System.currentTimeMillis(), "kris"),
+                new Host("192.168.1.2", 80, 10, System.currentTimeMillis(), "kris")));
         Assert.assertEquals("192.168.1.1", result.getIp());
 
     }