YARN-4994. Use MiniYARNCluster with try-with-resources in tests. Contributed by Andras Bokor.

hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-app/src/test/java/org/apache/hadoop/mapreduce/jobhistory/TestJobHistoryEventHandler.java

@@ -563,11 +563,9 @@ public class TestJobHistoryEventHandler {
     TestParams t = new TestParams(RunningAppContext.class, false);
     Configuration conf = new YarnConfiguration();
     conf.setBoolean(YarnConfiguration.TIMELINE_SERVICE_ENABLED, true);
-    MiniYARNCluster yarnCluster = null;
     long currentTime = System.currentTimeMillis();
-    try {
+    try (MiniYARNCluster yarnCluster = new MiniYARNCluster(
-      yarnCluster = new MiniYARNCluster(
+        TestJobHistoryEventHandler.class.getSimpleName(), 1, 1, 1, 1)) {
-            TestJobHistoryEventHandler.class.getSimpleName(), 1, 1, 1, 1);
       yarnCluster.init(conf);
       yarnCluster.start();
       Configuration confJHEH = new YarnConfiguration(conf);
@@ -720,10 +718,6 @@ public class TestJobHistoryEventHandler {
               tEntity.getEvents().get(0).getEventInfo().get("TASK_TYPE"));
       Assert.assertEquals(TaskType.MAP.toString(),
               tEntity.getEvents().get(1).getEventInfo().get("TASK_TYPE"));
-    } finally {
-      if (yarnCluster != null) {
-        yarnCluster.stop();
-      }
     }
   }
 

hadoop-tools/hadoop-archive-logs/src/test/java/org/apache/hadoop/tools/TestHadoopArchiveLogs.java

@@ -165,13 +165,11 @@ public class TestHadoopArchiveLogs {
 
   @Test(timeout = 30000)
   public void testFilterAppsByAggregatedStatus() throws Exception {
-    MiniYARNCluster yarnCluster = null;
+    try (MiniYARNCluster yarnCluster =
-    try {
+        new MiniYARNCluster(TestHadoopArchiveLogs.class.getSimpleName(),
+            1, 1, 1, 1)) {
       Configuration conf = new Configuration();
       conf.setBoolean(YarnConfiguration.LOG_AGGREGATION_ENABLED, true);
-      yarnCluster =
-          new MiniYARNCluster(TestHadoopArchiveLogs.class.getSimpleName(), 1,
-              1, 1, 1);
       yarnCluster.init(conf);
       yarnCluster.start();
       conf = yarnCluster.getConfig();
@@ -237,10 +235,6 @@ public class TestHadoopArchiveLogs {
       Assert.assertTrue(hal.eligibleApplications.contains(app4));
       Assert.assertTrue(hal.eligibleApplications.contains(app7));
       Assert.assertTrue(hal.eligibleApplications.contains(app8));
-    } finally {
-      if (yarnCluster != null) {
-        yarnCluster.stop();
-      }
     }
   }
 

hadoop-tools/hadoop-archive-logs/src/test/java/org/apache/hadoop/tools/TestHadoopArchiveLogsRunner.java

@@ -52,16 +52,14 @@ public class TestHadoopArchiveLogsRunner {
 
   @Test(timeout = 50000)
   public void testHadoopArchiveLogs() throws Exception {
-    MiniYARNCluster yarnCluster = null;
     MiniDFSCluster dfsCluster = null;
     FileSystem fs = null;
-    try {
+    try (MiniYARNCluster yarnCluster =
+        new MiniYARNCluster(TestHadoopArchiveLogsRunner.class.getSimpleName(),
+            1, 2, 1, 1)) {
       Configuration conf = new YarnConfiguration();
       conf.setBoolean(YarnConfiguration.LOG_AGGREGATION_ENABLED, true);
       conf.setBoolean(YarnConfiguration.YARN_MINICLUSTER_FIXED_PORTS, true);
-      yarnCluster =
-          new MiniYARNCluster(TestHadoopArchiveLogsRunner.class.getSimpleName(),
-              1, 2, 1, 1);
       yarnCluster.init(conf);
       yarnCluster.start();
       conf = yarnCluster.getConfig();
@@ -133,9 +131,6 @@ public class TestHadoopArchiveLogsRunner {
           harLogs[2].getOwner());
       Assert.assertEquals(0, fs.listStatus(workingDir).length);
     } finally {
-      if (yarnCluster != null) {
-        yarnCluster.stop();
-      }
       if (fs != null) {
         fs.close();
       }

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

@@ -35,8 +35,6 @@ public class TestHedgingRequestRMFailoverProxyProvider {
 
   @Test
   public void testHedgingRequestProxyProvider() throws Exception {
-    final MiniYARNCluster cluster =
-        new MiniYARNCluster("testHedgingRequestProxyProvider", 5, 0, 1, 1);
     Configuration conf = new YarnConfiguration();
 
     conf.setBoolean(YarnConfiguration.RM_HA_ENABLED, true);
@@ -49,6 +47,9 @@ public class TestHedgingRequestRMFailoverProxyProvider {
     conf.setLong(YarnConfiguration.RESOURCEMANAGER_CONNECT_RETRY_INTERVAL_MS,
         2000);
 
+    try (MiniYARNCluster cluster =
+        new MiniYARNCluster("testHedgingRequestProxyProvider", 5, 0, 1, 1)) {
+
       HATestUtil.setRpcAddressForRM("rm1", 10000, conf);
       HATestUtil.setRpcAddressForRM("rm2", 20000, conf);
       HATestUtil.setRpcAddressForRM("rm3", 30000, conf);
@@ -83,7 +84,7 @@ public class TestHedgingRequestRMFailoverProxyProvider {
 
       validateActiveRM(client);
 
-    cluster.stop();
+    }
   }
 
   private void validateActiveRM(YarnClient client) throws IOException {

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-client/src/test/java/org/apache/hadoop/yarn/client/api/impl/TestAMRMProxy.java

@@ -60,11 +60,11 @@ public class TestAMRMProxy extends BaseAMRMProxyE2ETest {
    */
   @Test(timeout = 120000)
   public void testAMRMProxyE2E() throws Exception {
-    MiniYARNCluster cluster = new MiniYARNCluster("testAMRMProxyE2E", 1, 1, 1);
-    YarnClient rmClient = null;
     ApplicationMasterProtocol client;
 
-    try {
+    try (MiniYARNCluster cluster = new MiniYARNCluster("testAMRMProxyE2E",
+        1, 1, 1);
+            YarnClient rmClient = YarnClient.createYarnClient()) {
       Configuration conf = new YarnConfiguration();
       conf.setBoolean(YarnConfiguration.AMRM_PROXY_ENABLED, true);
       cluster.init(conf);
@@ -75,7 +75,6 @@ public class TestAMRMProxy extends BaseAMRMProxyE2ETest {
 
       yarnConf.set(YarnConfiguration.RM_SCHEDULER_ADDRESS,
           YarnConfiguration.DEFAULT_AMRM_PROXY_ADDRESS);
-      rmClient = YarnClient.createYarnClient();
       rmClient.init(yarnConf);
       rmClient.start();
 
@@ -135,11 +134,6 @@ public class TestAMRMProxy extends BaseAMRMProxyE2ETest {
       Thread.sleep(500);
       Assert.assertNotEquals(RMAppState.FINISHED, rmApp.getState());
 
-    } finally {
-      if (rmClient != null) {
-        rmClient.stop();
-      }
-      cluster.stop();
     }
   }
 
@@ -150,12 +144,11 @@ public class TestAMRMProxy extends BaseAMRMProxyE2ETest {
    */
   @Test(timeout = 120000)
   public void testE2ETokenRenewal() throws Exception {
-    MiniYARNCluster cluster =
-        new MiniYARNCluster("testE2ETokenRenewal", 1, 1, 1);
-    YarnClient rmClient = null;
     ApplicationMasterProtocol client;
 
-    try {
+    try (MiniYARNCluster cluster =
+        new MiniYARNCluster("testE2ETokenRenewal", 1, 1, 1);
+           YarnClient rmClient = YarnClient.createYarnClient()) {
       Configuration conf = new YarnConfiguration();
       conf.setBoolean(YarnConfiguration.AMRM_PROXY_ENABLED, true);
       conf.setInt(YarnConfiguration.RM_NM_EXPIRY_INTERVAL_MS, 1500);
@@ -170,7 +163,6 @@ public class TestAMRMProxy extends BaseAMRMProxyE2ETest {
       final Configuration yarnConf = cluster.getConfig();
       yarnConf.set(YarnConfiguration.RM_SCHEDULER_ADDRESS,
           YarnConfiguration.DEFAULT_AMRM_PROXY_ADDRESS);
-      rmClient = YarnClient.createYarnClient();
       rmClient.init(yarnConf);
       rmClient.start();
 
@@ -216,11 +208,6 @@ public class TestAMRMProxy extends BaseAMRMProxyE2ETest {
       client.finishApplicationMaster(FinishApplicationMasterRequest
           .newInstance(FinalApplicationStatus.SUCCEEDED, "success", null));
 
-    } finally {
-      if (rmClient != null) {
-        rmClient.stop();
-      }
-      cluster.stop();
     }
   }
 
@@ -230,11 +217,11 @@ public class TestAMRMProxy extends BaseAMRMProxyE2ETest {
    */
   @Test(timeout = 120000)
   public void testE2ETokenSwap() throws Exception {
-    MiniYARNCluster cluster = new MiniYARNCluster("testE2ETokenSwap", 1, 1, 1);
-    YarnClient rmClient = null;
     ApplicationMasterProtocol client;
 
-    try {
+    try (MiniYARNCluster cluster = new MiniYARNCluster("testE2ETokenSwap",
+        1, 1, 1);
+            YarnClient rmClient = YarnClient.createYarnClient()) {
       Configuration conf = new YarnConfiguration();
       conf.setBoolean(YarnConfiguration.AMRM_PROXY_ENABLED, true);
       cluster.init(conf);
@@ -242,7 +229,6 @@ public class TestAMRMProxy extends BaseAMRMProxyE2ETest {
 
       // the client will connect to the RM with the token provided by AMRMProxy
       final Configuration yarnConf = cluster.getConfig();
-      rmClient = YarnClient.createYarnClient();
       rmClient.init(yarnConf);
       rmClient.start();
 
@@ -260,11 +246,6 @@ public class TestAMRMProxy extends BaseAMRMProxyE2ETest {
             e.getMessage().startsWith("Invalid AMRMToken from appattempt_"));
       }
 
-    } finally {
-      if (rmClient != null) {
-        rmClient.stop();
-      }
-      cluster.stop();
     }
   }
 }

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

@@ -1721,15 +1721,13 @@ public class TestYarnCLI {
         + "ProportionalCapacityPreemptionPolicy");
     conf.setBoolean(YarnConfiguration.RM_SCHEDULER_ENABLE_MONITORS, true);
     conf.setBoolean(PREFIX + "root.a.a1.disable_preemption", true);
-    MiniYARNCluster cluster =
-        new MiniYARNCluster("testReservationAPIs", 2, 1, 1);
 
-    YarnClient yarnClient = null;
+    try (MiniYARNCluster cluster =
-    try {
+        new MiniYARNCluster("testReservationAPIs", 2, 1, 1);
+         YarnClient yarnClient = YarnClient.createYarnClient()) {
       cluster.init(conf);
       cluster.start();
       final Configuration yarnConf = cluster.getConfig();
-      yarnClient = YarnClient.createYarnClient();
       yarnClient.init(yarnConf);
       yarnClient.start();
 
@@ -1742,13 +1740,6 @@ public class TestYarnCLI {
       assertEquals(0, result);
       Assert.assertTrue(sysOutStream.toString()
           .contains("Preemption : disabled"));
-    } finally {
-      // clean-up
-      if (yarnClient != null) {
-        yarnClient.stop();
-      }
-      cluster.stop();
-      cluster.close();
     }
   }
   

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-tests/src/test/java/org/apache/hadoop/yarn/server/TestMiniYarnCluster.java

@@ -24,6 +24,7 @@ import org.apache.hadoop.yarn.conf.YarnConfiguration;
 import org.apache.hadoop.yarn.server.resourcemanager.HATestUtil;
 import org.junit.Assert;
 import org.junit.Test;
+import java.io.IOException;
 
 public class TestMiniYarnCluster {
 
@@ -41,10 +42,11 @@ public class TestMiniYarnCluster {
      */
     conf.setBoolean(YarnConfiguration.TIMELINE_SERVICE_ENABLED, false);
     enableAHS = false;
-    MiniYARNCluster cluster = null;
+    try (MiniYARNCluster cluster =
-    try {
+        new MiniYARNCluster(TestMiniYarnCluster.class.getSimpleName(),
-      cluster = new MiniYARNCluster(TestMiniYarnCluster.class.getSimpleName(),
+            numNodeManagers, numLocalDirs, numLogDirs, numLogDirs,
-          numNodeManagers, numLocalDirs, numLogDirs, numLogDirs, enableAHS);
+                enableAHS)) {
+
       cluster.init(conf);
       cluster.start();
 
@@ -52,11 +54,6 @@ public class TestMiniYarnCluster {
       Assert.assertNull("Timeline Service should not have been started",
           cluster.getApplicationHistoryServer());
     }
-    finally {
-      if(cluster != null) {
-        cluster.stop();
-      }
-    }
 
     /*
      * Timeline service should start if TIMELINE_SERVICE_ENABLED == true
@@ -64,10 +61,10 @@ public class TestMiniYarnCluster {
      */
     conf.setBoolean(YarnConfiguration.TIMELINE_SERVICE_ENABLED, true);
     enableAHS = false;
-    cluster = null;
+    try (MiniYARNCluster cluster =
-    try {
+        new MiniYARNCluster(TestMiniYarnCluster.class.getSimpleName(),
-      cluster = new MiniYARNCluster(TestMiniYarnCluster.class.getSimpleName(),
+            numNodeManagers, numLocalDirs, numLogDirs, numLogDirs,
-          numNodeManagers, numLocalDirs, numLogDirs, numLogDirs, enableAHS);
+                enableAHS)) {
       cluster.init(conf);
 
       // Verify that the timeline-service starts on ephemeral ports by default
@@ -87,21 +84,16 @@ public class TestMiniYarnCluster {
       Assert.assertNotNull("Timeline Service should have been started",
           cluster.getApplicationHistoryServer());
     }
-    finally {
-      if(cluster != null) {
-        cluster.stop();
-      }
-    }
     /*
      * Timeline service should start if TIMELINE_SERVICE_ENABLED == false
      * and enableAHS == true
      */
     conf.setBoolean(YarnConfiguration.TIMELINE_SERVICE_ENABLED, false);
     enableAHS = true;
-    cluster = null;
+    try (MiniYARNCluster cluster =
-    try {
+        new MiniYARNCluster(TestMiniYarnCluster.class.getSimpleName(),
-      cluster = new MiniYARNCluster(TestMiniYarnCluster.class.getSimpleName(),
+            numNodeManagers, numLocalDirs, numLogDirs, numLogDirs,
-          numNodeManagers, numLocalDirs, numLogDirs, numLogDirs, enableAHS);
+                enableAHS)) {
       cluster.init(conf);
       cluster.start();
 
@@ -115,15 +107,10 @@ public class TestMiniYarnCluster {
       Assert.assertNotNull("Timeline Service should have been started",
           cluster.getApplicationHistoryServer());
     }
-    finally {
-      if(cluster != null) {
-        cluster.stop();
-      }
-    }
   }
 
   @Test
-  public void testMultiRMConf() {
+  public void testMultiRMConf() throws IOException {
     String RM1_NODE_ID = "rm1", RM2_NODE_ID = "rm2";
     int RM1_PORT_BASE = 10000, RM2_PORT_BASE = 20000;
     Configuration conf = new YarnConfiguration();
@@ -137,23 +124,28 @@ public class TestMiniYarnCluster {
     conf.setBoolean(YarnConfiguration.YARN_MINICLUSTER_FIXED_PORTS, true);
     conf.setBoolean(YarnConfiguration.YARN_MINICLUSTER_USE_RPC, true);
 
-    MiniYARNCluster cluster =
+    try (MiniYARNCluster cluster =
         new MiniYARNCluster(TestMiniYarnCluster.class.getName(),
-            2, 0, 1, 1);
+            2, 0, 1, 1)) {
       cluster.init(conf);
       Configuration conf1 = cluster.getResourceManager(0).getConfig(),
           conf2 = cluster.getResourceManager(1).getConfig();
       Assert.assertFalse(conf1 == conf2);
       Assert.assertEquals("0.0.0.0:18032",
-        conf1.get(HAUtil.addSuffix(YarnConfiguration.RM_ADDRESS, RM1_NODE_ID)));
+          conf1.get(HAUtil.addSuffix(YarnConfiguration.RM_ADDRESS,
+              RM1_NODE_ID)));
       Assert.assertEquals("0.0.0.0:28032",
-        conf1.get(HAUtil.addSuffix(YarnConfiguration.RM_ADDRESS, RM2_NODE_ID)));
+          conf1.get(HAUtil.addSuffix(YarnConfiguration.RM_ADDRESS,
+              RM2_NODE_ID)));
       Assert.assertEquals("rm1", conf1.get(YarnConfiguration.RM_HA_ID));
 
       Assert.assertEquals("0.0.0.0:18032",
-        conf2.get(HAUtil.addSuffix(YarnConfiguration.RM_ADDRESS, RM1_NODE_ID)));
+          conf2.get(HAUtil.addSuffix(YarnConfiguration.RM_ADDRESS,
+              RM1_NODE_ID)));
       Assert.assertEquals("0.0.0.0:28032",
-        conf2.get(HAUtil.addSuffix(YarnConfiguration.RM_ADDRESS, RM2_NODE_ID)));
+          conf2.get(HAUtil.addSuffix(YarnConfiguration.RM_ADDRESS,
+              RM2_NODE_ID)));
       Assert.assertEquals("rm2", conf2.get(YarnConfiguration.RM_HA_ID));
     }
+  }
 }