HADOOP-19617. [JDK17] Remove JUnit4 Dependency (YARN) .

hadoop-project/pom.xml

@@ -186,7 +186,7 @@
       --enable-native-access=ALL-UNNAMED
     </extraJavaTestArgs>
     <!-- Plugin versions and config -->
-    <maven-surefire-plugin.argLine>-Xmx4096m -Xss2m -XX:+HeapDumpOnOutOfMemoryError ${extraJavaTestArgs}</maven-surefire-plugin.argLine>
+    <maven-surefire-plugin.argLine>-Xmx4096m -Xss4m -XX:+HeapDumpOnOutOfMemoryError ${extraJavaTestArgs}</maven-surefire-plugin.argLine>
     <maven-surefire-plugin.version>3.5.3</maven-surefire-plugin.version>
     <maven-surefire-report-plugin.version>${maven-surefire-plugin.version}</maven-surefire-report-plugin.version>
     <maven-failsafe-plugin.version>${maven-surefire-plugin.version}</maven-failsafe-plugin.version>

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-api/pom.xml

@@ -80,11 +80,6 @@
       </exclusions>
     </dependency>
 
-    <dependency>
-      <groupId>junit</groupId>
-      <artifactId>junit</artifactId>
-      <scope>test</scope>
-    </dependency>
     <dependency>
       <groupId>org.junit.jupiter</groupId>
       <artifactId>junit-jupiter-api</artifactId>
@@ -95,11 +90,6 @@
       <artifactId>junit-jupiter-engine</artifactId>
       <scope>test</scope>
     </dependency>
-    <dependency>
-      <groupId>org.junit.vintage</groupId>
-      <artifactId>junit-vintage-engine</artifactId>
-      <scope>test</scope>
-    </dependency>
     <!-- Only required to run tests in an IDE that bundles an older version -->
     <dependency>
       <groupId>org.junit.platform</groupId>

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-applications/hadoop-yarn-applications-distributedshell/pom.xml

@@ -39,12 +39,6 @@
       <scope>provided</scope>
     </dependency>
 
-    <dependency>
-      <groupId>junit</groupId>
-      <artifactId>junit</artifactId>
-      <scope>test</scope>
-    </dependency>
-
     <dependency>
       <groupId>ch.qos.reload4j</groupId>
       <artifactId>reload4j</artifactId>
@@ -182,11 +176,6 @@
       <artifactId>junit-platform-launcher</artifactId>
       <scope>test</scope>
     </dependency>
-    <dependency>
-      <groupId>org.junit.vintage</groupId>
-      <artifactId>junit-vintage-engine</artifactId>
-      <scope>test</scope>
-    </dependency>
 
   </dependencies>
 

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-applications/hadoop-yarn-applications-distributedshell/src/test/java/org/apache/hadoop/yarn/applications/distributedshell/DistributedShellBaseTest.java

@@ -33,6 +33,7 @@
 import java.util.concurrent.atomic.AtomicReference;
 import java.util.function.Supplier;
 
+import org.apache.hadoop.security.UserGroupInformation;
 import org.junit.jupiter.api.AfterEach;
 import org.junit.jupiter.api.AfterAll;
 import org.junit.jupiter.api.BeforeEach;
@@ -545,6 +546,20 @@ protected void setupInternal(int numNodeManagers,
         getTimelineVersion());
     // setup the configuration of relevant for each TimelineService version.
     customizeConfiguration(conf);
+
+    // To avoid data conflicts between unit tests caused by sharing the common directory
+    // file:/tmp/hadoop-yarn-jenkins/node-labels—such as one test reading data written by another
+    // and resulting in failures—we have optimized the directory logic.
+    // Each unit test will now generate a unique directory path based on its method name.
+    // For example:
+    // file:/tmp/hadoop-yarn-jenkins/<method-name>/node-labels
+    String nodeLabels = "file:///tmp/hadoop-yarn-" +
+        UserGroupInformation.getCurrentUser().getShortUserName() +
+        "/" + methodName + "/node-labels";
+    java.nio.file.Path nodeLabelsPath = Paths.get(nodeLabels);
+    Files.deleteIfExists(nodeLabelsPath);
+    conf.set(YarnConfiguration.FS_NODE_LABELS_STORE_ROOT_DIR, nodeLabels);
+
     // setup the yarn cluster.
     setUpYarnCluster(numNodeManagers, conf);
   }

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-applications/hadoop-yarn-applications-unmanaged-am-launcher/pom.xml

@@ -32,11 +32,6 @@
   </properties>
 
   <dependencies>
-    <dependency>
-      <groupId>junit</groupId>
-      <artifactId>junit</artifactId>
-      <scope>test</scope>
-    </dependency>
     <dependency>
       <groupId>commons-cli</groupId>
       <artifactId>commons-cli</artifactId>

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-applications/hadoop-yarn-services/hadoop-yarn-services-api/pom.xml

@@ -186,11 +186,6 @@
       <artifactId>hadoop-common</artifactId>
       <type>test-jar</type>
     </dependency>
-    <dependency>
-      <groupId>junit</groupId>
-      <artifactId>junit</artifactId>
-      <scope>test</scope>
-    </dependency>
     <dependency>
       <groupId>org.apache.hadoop</groupId>
       <artifactId>hadoop-yarn-services-core</artifactId>

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-applications/hadoop-yarn-services/hadoop-yarn-services-core/pom.xml

@@ -244,12 +244,6 @@
     <!-- Test dependencies -->
     <!-- ======================================================== -->
 
-    <dependency>
-      <groupId>junit</groupId>
-      <artifactId>junit</artifactId>
-      <scope>test</scope>
-    </dependency>
-
     <dependency>
       <groupId>org.mockito</groupId>
       <artifactId>mockito-inline</artifactId>
@@ -289,11 +283,6 @@
       <artifactId>junit-platform-launcher</artifactId>
       <scope>test</scope>
     </dependency>
-    <dependency>
-      <groupId>org.junit.vintage</groupId>
-      <artifactId>junit-vintage-engine</artifactId>
-      <scope>test</scope>
-    </dependency>
   </dependencies>
 
 </project>

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-client/pom.xml

@@ -118,11 +118,6 @@
       <artifactId>snappy-java</artifactId>
       <scope>provided</scope>
     </dependency>
-    <dependency>
-      <groupId>junit</groupId>
-      <artifactId>junit</artifactId>
-      <scope>test</scope>
-    </dependency>
     <dependency>
       <groupId>org.assertj</groupId>
       <artifactId>assertj-core</artifactId>
@@ -191,11 +186,6 @@
       <artifactId>junit-platform-launcher</artifactId>
       <scope>test</scope>
     </dependency>
-    <dependency>
-      <groupId>org.junit.vintage</groupId>
-      <artifactId>junit-vintage-engine</artifactId>
-      <scope>test</scope>
-    </dependency>
 
   </dependencies>
 

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-client/src/test/java/org/apache/hadoop/yarn/client/TestGetGroups.java

@@ -31,10 +31,10 @@
 import org.apache.hadoop.util.Tool;
 import org.apache.hadoop.yarn.conf.YarnConfiguration;
 import org.apache.hadoop.yarn.server.resourcemanager.ResourceManager;
-import org.junit.AfterClass;
-import org.junit.Assert;
-import org.junit.Before;
-import org.junit.BeforeClass;
+import org.junit.jupiter.api.AfterAll;
+import org.junit.jupiter.api.Assertions;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.BeforeAll;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
@@ -47,7 +47,7 @@ public class TestGetGroups extends GetGroupsTestBase {
 
   private static Configuration conf;
 
-  @BeforeClass
+  @BeforeAll
   public static void setUpResourceManager() throws InterruptedException {
     conf = new YarnConfiguration();
     resourceManager = new ResourceManager() {
@@ -77,19 +77,19 @@ public void run() {
     }.start();
 
     boolean rmStarted = rmStartedSignal.await(60000L, TimeUnit.MILLISECONDS);
-    Assert.assertTrue("ResourceManager failed to start up.", rmStarted);
+    Assertions.assertTrue(rmStarted, "ResourceManager failed to start up.");
 
     LOG.info("ResourceManager RMAdmin address: {}.",
         conf.get(YarnConfiguration.RM_ADMIN_ADDRESS));
   }
 
   @SuppressWarnings("static-access")
-  @Before
+  @BeforeEach
   public void setUpConf() {
     super.conf = this.conf;
   }
 
-  @AfterClass
+  @AfterAll
   public static void tearDownResourceManager() throws InterruptedException {
     if (resourceManager != null) {
       LOG.info("Stopping ResourceManager...");

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-client/src/test/java/org/apache/hadoop/yarn/client/TestRMFailover.java

@@ -18,12 +18,12 @@
 
 package org.apache.hadoop.yarn.client;
 
-import static org.junit.Assert.assertEquals;
-import static org.junit.Assert.assertFalse;
-import static org.junit.Assert.assertTrue;
-import static org.junit.Assert.assertNull;
-import static org.junit.Assert.assertSame;
-import static org.junit.Assert.fail;
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertFalse;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+import static org.junit.jupiter.api.Assertions.assertNull;
+import static org.junit.jupiter.api.Assertions.assertSame;
+import static org.junit.jupiter.api.Assertions.fail;
 import static org.mockito.Mockito.spy;
 import static org.mockito.Mockito.verify;
 
@@ -56,10 +56,10 @@
 import org.apache.hadoop.yarn.server.resourcemanager.RMFatalEventType;
 import org.apache.hadoop.yarn.server.webproxy.WebAppProxyServer;
 import org.apache.hadoop.yarn.webapp.YarnWebParams;
-import org.junit.After;
-import org.junit.Assert;
-import org.junit.Before;
-import org.junit.Test;
+import org.junit.jupiter.api.AfterEach;
+import org.junit.jupiter.api.Assertions;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
 
 import java.util.function.Supplier;
 import org.slf4j.Logger;
@@ -81,7 +81,7 @@ public class TestRMFailover extends ClientBaseWithFixes {
   private MiniYARNCluster cluster;
   private ApplicationId fakeAppId;
 
-  @Before
+  @BeforeEach
   public void setup() throws IOException {
     fakeAppId = ApplicationId.newInstance(System.currentTimeMillis(), 0);
     conf = new YarnConfiguration();
@@ -98,7 +98,7 @@ public void setup() throws IOException {
     cluster = new MiniYARNCluster(TestRMFailover.class.getName(), 2, 1, 1, 1);
   }
 
-  @After
+  @AfterEach
   public void teardown() {
     cluster.stop();
   }
@@ -123,8 +123,8 @@ private void verifyClientConnection() {
   }
 
   private void verifyConnections() throws InterruptedException, YarnException {
-    assertTrue("NMs failed to connect to the RM",
-        cluster.waitForNodeManagersToConnect(20000));
+    assertTrue(
+        cluster.waitForNodeManagersToConnect(20000), "NMs failed to connect to the RM");
     verifyClientConnection();
   }
 
@@ -137,15 +137,15 @@ private void explicitFailover() throws IOException {
     int newActiveRMIndex = (activeRMIndex + 1) % 2;
     getAdminService(activeRMIndex).transitionToStandby(req);
     getAdminService(newActiveRMIndex).transitionToActive(req);
-    assertEquals("Failover failed", newActiveRMIndex, cluster.getActiveRMIndex());
+    assertEquals(newActiveRMIndex, cluster.getActiveRMIndex(), "Failover failed");
   }
 
   private void failover()
       throws IOException, InterruptedException, YarnException {
     int activeRMIndex = cluster.getActiveRMIndex();
     cluster.stopResourceManager(activeRMIndex);
-    assertEquals("Failover failed",
-        (activeRMIndex + 1) % 2, cluster.getActiveRMIndex());
+    assertEquals(
+        (activeRMIndex + 1) % 2, cluster.getActiveRMIndex(), "Failover failed");
     cluster.restartResourceManager(activeRMIndex);
   }
 
@@ -155,7 +155,7 @@ public void testExplicitFailover()
     conf.setBoolean(YarnConfiguration.AUTO_FAILOVER_ENABLED, false);
     cluster.init(conf);
     cluster.start();
-    assertFalse("RM never turned active", -1 == cluster.getActiveRMIndex());
+    assertFalse(-1 == cluster.getActiveRMIndex(), "RM never turned active");
     verifyConnections();
 
     explicitFailover();
@@ -189,7 +189,7 @@ public void testAutomaticFailover()
 
     cluster.init(conf);
     cluster.start();
-    assertFalse("RM never turned active", -1 == cluster.getActiveRMIndex());
+    assertFalse(-1 == cluster.getActiveRMIndex(), "RM never turned active");
     verifyConnections();
 
     failover();
@@ -220,14 +220,14 @@ public void testWebAppProxyInStandAloneMode() throws YarnException,
       cluster.init(conf);
       cluster.start();
       getAdminService(0).transitionToActive(req);
-      assertFalse("RM never turned active", -1 == cluster.getActiveRMIndex());
+      assertFalse(-1 == cluster.getActiveRMIndex(), "RM never turned active");
       verifyConnections();
       webAppProxyServer.init(conf);
 
       // Start webAppProxyServer
-      Assert.assertEquals(STATE.INITED, webAppProxyServer.getServiceState());
+      Assertions.assertEquals(STATE.INITED, webAppProxyServer.getServiceState());
       webAppProxyServer.start();
-      Assert.assertEquals(STATE.STARTED, webAppProxyServer.getServiceState());
+      Assertions.assertEquals(STATE.STARTED, webAppProxyServer.getServiceState());
 
       // send httpRequest with fakeApplicationId
       // expect to get "Not Found" response and 404 response code
@@ -253,7 +253,7 @@ public void testEmbeddedWebAppProxy() throws YarnException,
     conf.setBoolean(YarnConfiguration.AUTO_FAILOVER_ENABLED, false);
     cluster.init(conf);
     cluster.start();
-    assertFalse("RM never turned active", -1 == cluster.getActiveRMIndex());
+    assertFalse(-1 == cluster.getActiveRMIndex(), "RM never turned active");
     verifyConnections();
 
     // send httpRequest with fakeApplicationId
@@ -391,7 +391,7 @@ public void testUncaughtExceptionHandlerWithHAEnabled()
     conf.set(YarnConfiguration.RM_ZK_ADDRESS, hostPort);
     cluster.init(conf);
     cluster.start();
-    assertFalse("RM never turned active", -1 == cluster.getActiveRMIndex());
+    assertFalse(-1 == cluster.getActiveRMIndex(), "RM never turned active");
 
     ResourceManager resourceManager = cluster.getResourceManager(
         cluster.getActiveRMIndex());

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-common/pom.xml

@@ -95,11 +95,6 @@
       <groupId>org.apache.hadoop</groupId>
       <artifactId>hadoop-annotations</artifactId>
     </dependency>
-    <dependency>
-      <groupId>junit</groupId>
-      <artifactId>junit</artifactId>
-      <scope>test</scope>
-    </dependency>
     <dependency>
       <groupId>org.mockito</groupId>
       <artifactId>mockito-inline</artifactId>