YARN-5662. Provide an option to enable ContainerMonitor. Contributed by Jian He.

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-api/src/main/java/org/apache/hadoop/yarn/conf/YarnConfiguration.java

@@ -1259,6 +1259,10 @@ public static boolean isAclEnabled(Configuration conf) {
       NM_PREFIX + "resource-monitor.interval-ms";
   public static final int DEFAULT_NM_RESOURCE_MON_INTERVAL_MS = 3000;
 
+  public static final String NM_CONTAINER_MONITOR_ENABLED =
+      NM_PREFIX + "container-monitor.enabled";
+  public static final boolean DEFAULT_NM_CONTAINER_MONITOR_ENABLED = true;
+
   /** How often to monitor containers.*/
   public final static String NM_CONTAINER_MON_INTERVAL_MS =
     NM_PREFIX + "container-monitor.interval-ms";

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-common/src/main/java/org/apache/hadoop/yarn/api/records/impl/pb/ContainerStatusPBImpl.java

@@ -95,6 +95,8 @@ public String toString() {
     sb.append("Capability: ").append(getCapability()).append(", ");
     sb.append("Diagnostics: ").append(getDiagnostics()).append(", ");
     sb.append("ExitStatus: ").append(getExitStatus()).append(", ");
+    sb.append("IP: ").append(getIPs()).append(", ");
+    sb.append("Host: ").append(getHost());
     sb.append("]");
     return sb.toString();
   }

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-common/src/main/resources/yarn-default.xml

@@ -1364,6 +1364,12 @@
     <name>yarn.nodemanager.resource-calculator.class</name>
   </property>
 
+  <property>
+    <description>Enable container monitor</description>
+    <name>yarn.nodemanager.container-monitor.enabled</name>
+    <value>true</value>
+  </property>
+
   <property>
     <description>How often to monitor containers. If not set, the value for
     yarn.nodemanager.resource-monitor.interval-ms will be used.</description>

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-nodemanager/src/main/java/org/apache/hadoop/yarn/server/nodemanager/containermanager/monitor/ContainersMonitorImpl.java

@@ -171,7 +171,7 @@ protected void serviceInit(Configuration conf) throws Exception {
     LOG.info("Physical memory check enabled: " + pmemCheckEnabled);
     LOG.info("Virtual memory check enabled: " + vmemCheckEnabled);
 
-    containersMonitorEnabled = isEnabled();
+    containersMonitorEnabled = isContainerMonitorEnabled();
     LOG.info("ContainersMonitor enabled: " + containersMonitorEnabled);
 
     nodeCpuPercentageForYARN =
@@ -204,23 +204,24 @@ protected void serviceInit(Configuration conf) throws Exception {
     super.serviceInit(conf);
   }
 
-  private boolean isEnabled() {
+  private boolean isContainerMonitorEnabled() {
+    return conf.getBoolean(YarnConfiguration.NM_CONTAINER_MONITOR_ENABLED,
+        YarnConfiguration.DEFAULT_NM_CONTAINER_MONITOR_ENABLED);
+  }
+
+  private boolean isResourceCalculatorAvailable() {
     if (resourceCalculatorPlugin == null) {
-            LOG.info("ResourceCalculatorPlugin is unavailable on this system. "
-                + this.getClass().getName() + " is disabled.");
+      LOG.info("ResourceCalculatorPlugin is unavailable on this system. " + this
+          .getClass().getName() + " is disabled.");
       return false;
     }
-    if (ResourceCalculatorProcessTree.getResourceCalculatorProcessTree("0", processTreeClass, conf) == null) {
+    if (ResourceCalculatorProcessTree
+        .getResourceCalculatorProcessTree("0", processTreeClass, conf)
+        == null) {
       LOG.info("ResourceCalculatorProcessTree is unavailable on this system. "
           + this.getClass().getName() + " is disabled.");
       return false;
     }
-    if (!(isPmemCheckEnabled() || isVmemCheckEnabled())) {
-      LOG.info("Neither virtual-memory nor physical-memory monitoring is " +
-          "needed. Not running the monitor-thread");
-      return false;
-    }
-
     return true;
   }
 
@@ -462,7 +463,7 @@ public void run() {
             }
             // End of initializing any uninitialized processTrees
 
-            if (pId == null) {
+            if (pId == null || !isResourceCalculatorAvailable()) {
               continue; // processTree cannot be tracked
             }
 

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-nodemanager/src/test/java/org/apache/hadoop/yarn/server/nodemanager/containermanager/monitor/TestContainersMonitor.java

@@ -29,15 +29,18 @@
 import java.io.IOException;
 import java.io.PrintWriter;
 import java.util.ArrayList;
+import java.util.Arrays;
 import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
 import java.util.regex.Pattern;
 
+import com.google.common.base.Supplier;
 import org.apache.commons.logging.LogFactory;
 import org.apache.hadoop.fs.FileUtil;
 import org.apache.hadoop.fs.Path;
 import org.apache.hadoop.fs.UnsupportedFileSystemException;
+import org.apache.hadoop.test.GenericTestUtils;
 import org.apache.hadoop.yarn.api.protocolrecords.GetContainerStatusesRequest;
 import org.apache.hadoop.yarn.api.protocolrecords.StartContainerRequest;
 import org.apache.hadoop.yarn.api.protocolrecords.StartContainersRequest;
@@ -181,6 +184,42 @@ public void testProcessTreeLimits() throws IOException {
     }
   }
 
+  // Test that even if VMEM_PMEM_CHECK is not enabled, container monitor will
+  // run.
+  @Test
+  public void testContainerMonitor() throws Exception {
+    conf.setBoolean(YarnConfiguration.NM_VMEM_CHECK_ENABLED, false);
+    conf.setBoolean(YarnConfiguration.NM_PMEM_CHECK_ENABLED, false);
+    containerManager.start();
+    ContainerLaunchContext context =
+        recordFactory.newRecordInstance(ContainerLaunchContext.class);
+    context.setCommands(Arrays.asList("sleep 6"));
+    ContainerId cId = createContainerId(1705);
+
+    // start the container
+    StartContainerRequest scRequest = StartContainerRequest.newInstance(context,
+        createContainerToken(cId, DUMMY_RM_IDENTIFIER, this.context.getNodeId(),
+            user, this.context.getContainerTokenSecretManager()));
+    StartContainersRequest allRequests =
+        StartContainersRequest.newInstance(Arrays.asList(scRequest));
+    containerManager.startContainers(allRequests);
+    BaseContainerManagerTest
+        .waitForContainerState(containerManager, cId, ContainerState.RUNNING);
+    Thread.sleep(2000);
+    GenericTestUtils.waitFor(new Supplier<Boolean>() {
+      public Boolean get() {
+        try {
+          return containerManager.getContainerStatuses(
+              GetContainerStatusesRequest.newInstance(Arrays.asList(cId)))
+              .getContainerStatuses().get(0).getHost() != null;
+        } catch (Exception e) {
+          return false;
+        }
+      }
+
+    }, 300, 10000);
+  }
+
   @Test
   public void testContainerKillOnMemoryOverflow() throws IOException,
       InterruptedException, YarnException {