YARN-9581. Fixed yarn logs cli to access RM2.

            Contributed by Prabhu Joseph

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-client/src/main/java/org/apache/hadoop/yarn/client/cli/LogsCLI.java

@@ -25,6 +25,7 @@ import com.sun.jersey.api.client.ClientRequest;
 import com.sun.jersey.api.client.ClientResponse;
 import com.sun.jersey.api.client.UniformInterfaceException;
 import com.sun.jersey.api.client.WebResource;
+import com.sun.jersey.api.client.WebResource.Builder;
 import com.sun.jersey.api.client.filter.ClientFilter;
 import com.sun.jersey.client.urlconnection.HttpURLConnectionFactory;
 import com.sun.jersey.client.urlconnection.URLConnectionClientHandler;
@@ -157,6 +158,9 @@ public class LogsCLI extends Configured implements Tool {
       if (yarnClient != null) {
         yarnClient.close();
       }
+      if (webServiceClient != null) {
+        webServiceClient.destroy();
+      }
     }
   }
 
@@ -420,24 +424,34 @@ public class LogsCLI extends Configured implements Tool {
   }
 
   protected List<JSONObject> getAMContainerInfoForRMWebService(
-      Configuration conf, String appId) throws ClientHandlerException,
-      UniformInterfaceException, JSONException {
-    String webAppAddress = WebAppUtils.getRMWebAppURLWithScheme(conf);
-
-    WebResource webResource = webServiceClient.resource(webAppAddress);
+      Configuration conf, String appId) throws Exception {
+    return WebAppUtils.execOnActiveRM(conf, this::getAMContainerInfoFromRM,
+        appId);
+  }
 
-    ClientResponse response =
-        webResource.path("ws").path("v1").path("cluster").path("apps")
-          .path(appId).path("appattempts").accept(MediaType.APPLICATION_JSON)
-          .get(ClientResponse.class);
-    JSONObject json =
-        response.getEntity(JSONObject.class).getJSONObject("appAttempts");
-    JSONArray requests = json.getJSONArray("appAttempt");
+  private List<JSONObject> getAMContainerInfoFromRM(
+      String webAppAddress, String appId) throws ClientHandlerException,
+      UniformInterfaceException, JSONException {
     List<JSONObject> amContainersList = new ArrayList<JSONObject>();
-    for (int i = 0; i < requests.length(); i++) {
-      amContainersList.add(requests.getJSONObject(i));
+    ClientResponse response = null;
+    try {
+      Builder builder = webServiceClient.resource(webAppAddress)
+          .path("ws").path("v1").path("cluster")
+          .path("apps").path(appId).path("appattempts")
+          .accept(MediaType.APPLICATION_JSON);
+      response = builder.get(ClientResponse.class);
+      JSONObject json = response.getEntity(JSONObject.class)
+          .getJSONObject("appAttempts");
+      JSONArray requests = json.getJSONArray("appAttempt");
+      for (int j = 0; j < requests.length(); j++) {
+        amContainersList.add(requests.getJSONObject(j));
+      }
+      return amContainersList;
+    } finally {
+      if (response != null) {
+        response.close();
+      }
     }
-    return amContainersList;
   }
 
   private List<JSONObject> getAMContainerInfoForAHSWebService(

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-client/src/main/java/org/apache/hadoop/yarn/client/cli/SchedConfCLI.java

@@ -21,13 +21,14 @@ package org.apache.hadoop.yarn.client.cli;
 import com.google.common.annotations.VisibleForTesting;
 import com.sun.jersey.api.client.Client;
 import com.sun.jersey.api.client.ClientResponse;
-import com.sun.jersey.api.client.WebResource;
+import com.sun.jersey.api.client.WebResource.Builder;
 import org.apache.commons.cli.CommandLine;
 import org.apache.commons.cli.GnuParser;
 import org.apache.commons.cli.MissingArgumentException;
 import org.apache.commons.cli.Options;
 import org.apache.hadoop.classification.InterfaceAudience.Public;
 import org.apache.hadoop.classification.InterfaceStability.Unstable;
+import org.apache.hadoop.conf.Configuration;
 import org.apache.hadoop.conf.Configured;
 import org.apache.hadoop.util.Tool;
 import org.apache.hadoop.yarn.conf.YarnConfiguration;
@@ -131,18 +132,22 @@ public class SchedConfCLI extends Configured implements Tool {
       return -1;
     }
 
+    Configuration conf = getConf();
+    return WebAppUtils.execOnActiveRM(conf,
+        this::updateSchedulerConfOnRMNode, updateInfo);
+  }
+
+  private int updateSchedulerConfOnRMNode(String webAppAddress,
+      SchedConfUpdateInfo updateInfo) throws Exception {
     Client webServiceClient = Client.create();
-    WebResource webResource = webServiceClient
-        .resource(WebAppUtils.getRMWebAppURLWithScheme(getConf()));
     ClientResponse response = null;
-
     try {
-      response =
-          webResource.path("ws").path("v1").path("cluster")
-              .path("scheduler-conf").accept(MediaType.APPLICATION_JSON)
-              .entity(YarnWebServiceUtils.toJson(updateInfo,
-                  SchedConfUpdateInfo.class), MediaType.APPLICATION_JSON)
-              .put(ClientResponse.class);
+      Builder builder = webServiceClient.resource(webAppAddress)
+          .path("ws").path("v1").path("cluster")
+          .path("scheduler-conf").accept(MediaType.APPLICATION_JSON);
+      builder.entity(YarnWebServiceUtils.toJson(updateInfo,
+          SchedConfUpdateInfo.class), MediaType.APPLICATION_JSON);
+      response = builder.put(ClientResponse.class);
       if (response != null) {
         if (response.getStatus() == Status.OK.getStatusCode()) {
           System.out.println("Configuration changed successfully.");
@@ -163,6 +168,7 @@ public class SchedConfCLI extends Configured implements Tool {
     }
   }
 
+
   @VisibleForTesting
   void addQueues(String args, SchedConfUpdateInfo updateInfo) {
     if (args == null) {

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-common/src/main/java/org/apache/hadoop/yarn/webapp/util/WebAppUtils.java

@@ -90,8 +90,33 @@ public class WebAppUtils {
     }
   }
 
+  /**
+   * Runs a certain function against the active RM. The function's first
+   * argument is expected to be a string which contains the address of
+   * the RM being tried.
+   */
+  public static <T, R> R execOnActiveRM(Configuration conf,
+      ThrowingBiFunction<String, T, R> func, T arg) throws Exception {
+    String rm1Address = getRMWebAppURLWithScheme(conf, 0);
+    try {
+      return func.apply(rm1Address, arg);
+    } catch (Exception e) {
+      if (HAUtil.isHAEnabled(conf)) {
+        String rm2Address = getRMWebAppURLWithScheme(conf, 1);
+        return func.apply(rm2Address, arg);
+      }
+      throw e;
+    }
+  }
+
+  /** A BiFunction which throws on Exception. */
+  @FunctionalInterface
+  public interface ThrowingBiFunction<T, U, R> {
+    R apply(T t, U u) throws Exception;
+  }
+
   public static String getRMWebAppURLWithoutScheme(Configuration conf,
-      boolean isHAEnabled)  {
+      boolean isHAEnabled, int haIdIndex)  {
     YarnConfiguration yarnConfig = new YarnConfiguration(conf);
     // set RM_ID if we have not configure it.
     if (isHAEnabled) {
@@ -99,7 +124,7 @@ public class WebAppUtils {
       if (rmId == null || rmId.isEmpty()) {
         List<String> rmIds = new ArrayList<>(HAUtil.getRMHAIds(conf));
         if (rmIds != null && !rmIds.isEmpty()) {
-          yarnConfig.set(YarnConfiguration.RM_HA_ID, rmIds.get(0));
+          yarnConfig.set(YarnConfiguration.RM_HA_ID, rmIds.get(haIdIndex));
         }
       }
     }
@@ -120,13 +145,19 @@ public class WebAppUtils {
     }
   }
 
+  public static String getRMWebAppURLWithScheme(Configuration conf,
+      int haIdIndex) {
+    return getHttpSchemePrefix(conf) + getRMWebAppURLWithoutScheme(
+        conf, HAUtil.isHAEnabled(conf), haIdIndex);
+  }
+
   public static String getRMWebAppURLWithScheme(Configuration conf) {
     return getHttpSchemePrefix(conf) + getRMWebAppURLWithoutScheme(
-        conf, HAUtil.isHAEnabled(conf));
+        conf, HAUtil.isHAEnabled(conf), 0);
   }
 
   public static String getRMWebAppURLWithoutScheme(Configuration conf) {
-    return getRMWebAppURLWithoutScheme(conf, false);
+    return getRMWebAppURLWithoutScheme(conf, false, 0);
   }
 
   public static String getRouterWebAppURLWithScheme(Configuration conf) {

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-common/src/main/java/org/apache/hadoop/yarn/webapp/util/YarnWebServiceUtils.java

@@ -21,7 +21,7 @@ import com.sun.jersey.api.client.Client;
 import com.sun.jersey.api.client.ClientHandlerException;
 import com.sun.jersey.api.client.ClientResponse;
 import com.sun.jersey.api.client.UniformInterfaceException;
-import com.sun.jersey.api.client.WebResource;
+import com.sun.jersey.api.client.WebResource.Builder;
 import javax.ws.rs.core.MediaType;
 
 import com.sun.jersey.api.json.JSONJAXBContext;
@@ -53,16 +53,29 @@ public final class YarnWebServiceUtils {
   public static JSONObject getNodeInfoFromRMWebService(Configuration conf,
       String nodeId) throws ClientHandlerException,
       UniformInterfaceException {
-    Client webServiceClient = Client.create();
-    String webAppAddress = WebAppUtils.getRMWebAppURLWithScheme(conf);
-
-    WebResource webResource = webServiceClient.resource(webAppAddress);
+    try {
+      return WebAppUtils.execOnActiveRM(conf,
+          YarnWebServiceUtils::getNodeInfoFromRM, nodeId);
+    } catch (Exception e) {
+      if (e instanceof ClientHandlerException) {
+        throw ((ClientHandlerException) e);
+      } else if (e instanceof UniformInterfaceException) {
+        throw ((UniformInterfaceException) e);
+      } else {
+        throw new RuntimeException(e);
+      }
+    }
+  }
 
+  private static JSONObject getNodeInfoFromRM(String webAppAddress,
+      String nodeId) throws ClientHandlerException, UniformInterfaceException {
+    Client webServiceClient = Client.create();
     ClientResponse response = null;
     try {
-      response = webResource.path("ws").path("v1").path("cluster")
-          .path("nodes").path(nodeId).accept(MediaType.APPLICATION_JSON)
-          .get(ClientResponse.class);
+      Builder builder = webServiceClient.resource(webAppAddress)
+          .path("ws").path("v1").path("cluster")
+          .path("nodes").path(nodeId).accept(MediaType.APPLICATION_JSON);
+      response = builder.get(ClientResponse.class);
       return response.getEntity(JSONObject.class);
     } finally {
       if (response != null) {

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-common/src/test/java/org/apache/hadoop/yarn/conf/TestYarnConfiguration.java

@@ -56,6 +56,12 @@ public class TestYarnConfiguration {
     conf2.set("yarn.resourcemanager.hostname.rm2", "40.40.40.40");
     String rmWebUrlinHA2 = WebAppUtils.getRMWebAppURLWithScheme(conf2);
     Assert.assertEquals("http://30.30.30.30:8088", rmWebUrlinHA2);
+
+    rmWebUrlinHA2 = WebAppUtils.getRMWebAppURLWithScheme(conf2, 0);
+    Assert.assertEquals("http://30.30.30.30:8088", rmWebUrlinHA2);
+
+    rmWebUrlinHA2 = WebAppUtils.getRMWebAppURLWithScheme(conf2, 1);
+    Assert.assertEquals("http://40.40.40.40:8088", rmWebUrlinHA2);
   }
 
   @Test